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「OSPFネットワーク構築その3 トータリースタブエリア」のエリア1をNSSAにし、
更にその先に小規模拠点を追加した。
・使用機器
Cisco1812×6台
この状況でどのようなルーティングテーブルになるか、
LSAタイプは何が流れるのか諸々確認。
まず、エリア1をNSSAにするためにR1・R2・R5に対してNSSAの設定を行う。
※ルータR1には追加でdefault-information-originateを設定する。
これはNSSAではデフォルトルートをLSAタイプ3で自動的にアドバタイズしないため。
この設定によって、LSAタイプ7でR1へのデフォルトルートがアドバタイズされるようになる。
更にその先に小規模拠点を追加した。
・使用機器
Cisco1812×6台
この状況でどのようなルーティングテーブルになるか、
LSAタイプは何が流れるのか諸々確認。
まず、エリア1をNSSAにするためにR1・R2・R5に対してNSSAの設定を行う。
※ルータR1には追加でdefault-information-originateを設定する。
これはNSSAではデフォルトルートをLSAタイプ3で自動的にアドバタイズしないため。
この設定によって、LSAタイプ7でR1へのデフォルトルートがアドバタイズされるようになる。
◇R1/R2の設定
R1(config)# router ospf 100
R1(config-router)# area 1 nssa default-information-originate
※構築時に「default-information-originate」を追加し忘れたため、
NSSA内エリアにデフォルトルートがアドバタイズされず、他エリアへのPingが通らなくて焦ったw
R2(config)# router ospf 100
R2(config-router)# area 1 nssa
◇NSSA内ASBRルータR5の設定
R5> enable
R5# conf t
R5(config)# hostname R5
R5(config)# interface fa 0
R5(config-if)# ip address 192.168.3.5 255.255.255.0
R5(config-if)# no shutdown
R5(config-if)# interface fa 1
R5(config-if)# ip address 10.1.1.5 255.255.255.0
R5(config-if)# no shutdown
R5(config-if)# exit
R5(config)# router ospf 100
R5(config-router)# redistribute rip metric 5 subnets
R5(config-router)# router-id 200.1.1.50
R5(config-router)# area 1 nssa //NSSAの設定
R5(config-router)# network 192.168.3.0 0.0.0.255 area 1
R5(config-router)# exit
R5(config)# router rip
R5(config-router)# version 2
R5(config-router)# redistribute ospf 100 metric 5 //再配送の設定(OSPF→RIP)
R5(config-router)# network 10.1.0.0
R5(config-router)# no auto-summary
R5(config-router)# end
R5# copy running-config startup-config
◇小規模拠点のルータR6の設定
R6> enable
R6# conf t
R6(config)# hostname R6
R6(config-if)# interface fa 0
R6(config-if)# ip address 10.1.1.6 255.255.255.0
R6(config-if)# no shutdown
R6(config-if)# interface lo 0
R6(config-if)# ip address 10.1.2.6 255.255.255.0
R6(config-if)# no shutdown
R6(config-if)# exit
R6(config)# router rip
R6(config-router)# version 2
R6(config-router)# network 10.1.0.0
R6(config-router)# no auto-summary
R6(config-router)# end
R6# copy running-config startup-config
設定が終わったらルーティングテーブルおよびLSAタイプを確認する。
------------<< R1 >>----------------------------------------------------------------
R1# sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
172.16.0.0/24 is subnetted, 2 subnets
O E2 172.16.1.0 [110/20] via 192.168.1.3, 01:52:04, FastEthernet0
O E2 172.16.2.0 [110/20] via 192.168.1.3, 01:51:02, FastEthernet0
192.168.5.0/26 is subnetted, 1 subnets
O IA 192.168.5.0 [110/2] via 192.168.1.3, 01:57:26, FastEthernet0
10.0.0.0/24 is subnetted, 2 subnets
O N2 10.1.2.0 [110/5] via 192.168.2.2, 00:06:20, FastEthernet1
O N2 10.1.1.0 [110/5] via 192.168.2.2, 00:06:10, FastEthernet1
C 192.168.1.0/24 is directly connected, FastEthernet0
192.168.2.0/28 is subnetted, 1 subnets
C 192.168.2.0 is directly connected, FastEthernet1
O 192.168.3.0/24 [110/2] via 192.168.2.2, 01:57:27, FastEthernet1
※小規模ドメインはOSPF NSSA external type 2からのルートとして載っている。
------------<< R1 >>----------------------------------------------------------------
R1# sh ip ospf
Routing Process "ospf 100" with ID 200.1.1.250
Supports only single TOS(TOS0) routes
Supports opaque LSA
Supports Link-local Signaling (LLS)
Supports area transit capability
It is an area border and autonomous system boundary router
Redistributing External Routes from,
Initial SPF schedule delay 5000 msecs
Minimum hold time between two consecutive SPFs 10000 msecs
Maximum wait time between two consecutive SPFs 10000 msecs
Incremental-SPF disabled
Minimum LSA interval 5 secs
Minimum LSA arrival 1000 msecs
LSA group pacing timer 240 secs
Interface flood pacing timer 33 msecs
Retransmission pacing timer 66 msecs
Number of external LSA 4. Checksum Sum 0x01D2C1
Number of opaque AS LSA 0. Checksum Sum 0x000000
Number of DCbitless external and opaque AS LSA 0
Number of DoNotAge external and opaque AS LSA 0
Number of areas in this router is 2. 1 normal 0 stub 1 nssa
Number of areas transit capable is 0
External flood list length 0
IETF NSF helper support enabled
Cisco NSF helper support enabled
Area BACKBONE(0)
Number of interfaces in this area is 1
Area has no authentication
SPF algorithm last executed 01:57:51.232 ago
SPF algorithm executed 11 times
Area ranges are
Number of LSA 6. Checksum Sum 0x03F625
Number of opaque link LSA 0. Checksum Sum 0x000000
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
Area 1
Number of interfaces in this area is 1
It is a NSSA area
Perform type-7/type-5 LSA translation
generates NSSA default route with cost 1
Area has no authentication
SPF algorithm last executed 01:57:41.232 ago
SPF algorithm executed 10 times
Area ranges are
Number of LSA 10. Checksum Sum 0x04B23B
Number of opaque link LSA 0. Checksum Sum 0x000000
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
※LSAタイプ7をタイプ5に変換する旨の表記があることが分かる。
------------<< R1 >>----------------------------------------------------------------
R1# sh ip ospf database
OSPF Router with ID (200.1.1.250) (Process ID 100)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
200.1.1.10 200.1.1.10 1893 0x8000005F 0x00351A 1
200.1.1.250 200.1.1.250 1374 0x8000000A 0x00B410 1
Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
192.168.1.1 200.1.1.250 1884 0x80000059 0x00CA4B
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
192.168.2.0 200.1.1.250 1374 0x8000005D 0x00B805
192.168.3.0 200.1.1.250 1374 0x80000004 0x00C441
192.168.5.0 200.1.1.10 1893 0x80000008 0x00C66A
Router Link States (Area 1)
Link ID ADV Router Age Seq# Checksum Link count
200.1.1.20 200.1.1.20 1086 0x8000000C 0x00D3C6 2
200.1.1.50 200.1.1.50 1379 0x80000008 0x0074D2 1
200.1.1.250 200.1.1.250 1375 0x8000000A 0x00704C 1
Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
192.168.2.1 200.1.1.250 1375 0x80000004 0x004227
192.168.3.5 200.1.1.50 1379 0x80000007 0x0040A3
Summary Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
192.168.1.0 200.1.1.250 1375 0x80000009 0x006C91
192.168.5.0 200.1.1.250 1375 0x80000009 0x00CE69
Type-7 AS External Link States (Area 1)
Link ID ADV Router Age Seq# Checksum Tag
0.0.0.0 200.1.1.250 1375 0x80000004 0x005F1D 0
10.1.1.0 200.1.1.50 417 0x80000003 0x0071B7 0
10.1.2.0 200.1.1.50 428 0x80000001 0x006ABF 0
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
10.1.1.0 200.1.1.250 411 0x80000003 0x005119 0
10.1.2.0 200.1.1.250 426 0x80000001 0x004A21 0
172.16.1.0 200.1.1.10 916 0x80000059 0x004C69 0
172.16.2.0 200.1.1.10 673 0x80000004 0x00EB1E 0
※LSDB内にタイプ7の情報があり、デフォルトルートが存在することが分かる。
------------<< R2 >>----------------------------------------------------------------
R2# sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is 192.168.2.1 to network 0.0.0.0
192.168.5.0/26 is subnetted, 1 subnets
O IA 192.168.5.0 [110/3] via 192.168.2.1, 01:59:59, FastEthernet0
10.0.0.0/24 is subnetted, 2 subnets
O N2 10.1.2.0 [110/5] via 192.168.3.5, 00:09:02, FastEthernet1
O N2 10.1.1.0 [110/5] via 192.168.3.5, 00:08:52, FastEthernet1
O IA 192.168.1.0/24 [110/2] via 192.168.2.1, 01:59:59, FastEthernet0
192.168.2.0/28 is subnetted, 1 subnets
C 192.168.2.0 is directly connected, FastEthernet0
C 192.168.3.0/24 is directly connected, FastEthernet1
O*N2 0.0.0.0/0 [110/1] via 192.168.2.1, 02:00:00, FastEthernet0
※小規模ドメインはRIP→OSPFの再配送によって、
N2 - OSPF NSSA external type 2でルート情報がアドバタイズされていることが分かる。
また、LSAタイプ7でアドバタイズされているデフォルトルートが存在している。
------------<< R2 >>----------------------------------------------------------------
R2# sh ip ospf
Routing Process "ospf 100" with ID 200.1.1.20
Supports only single TOS(TOS0) routes
Supports opaque LSA
Supports Link-local Signaling (LLS)
Supports area transit capability
Initial SPF schedule delay 5000 msecs
Minimum hold time between two consecutive SPFs 10000 msecs
Maximum wait time between two consecutive SPFs 10000 msecs
Incremental-SPF disabled
Minimum LSA interval 5 secs
Minimum LSA arrival 1000 msecs
LSA group pacing timer 240 secs
Interface flood pacing timer 33 msecs
Retransmission pacing timer 66 msecs
Number of external LSA 0. Checksum Sum 0x000000
Number of opaque AS LSA 0. Checksum Sum 0x000000
Number of DCbitless external and opaque AS LSA 0
Number of DoNotAge external and opaque AS LSA 0
Number of areas in this router is 1. 0 normal 0 stub 1 nssa
Number of areas transit capable is 0
External flood list length 0
IETF NSF helper support enabled
Cisco NSF helper support enabled
Area 1
Number of interfaces in this area is 2
It is a NSSA area
Area has no authentication
SPF algorithm last executed 02:00:47.832 ago
SPF algorithm executed 8 times
Area ranges are
Number of LSA 10. Checksum Sum 0x04B23B
Number of opaque link LSA 0. Checksum Sum 0x000000
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
------------<< R2 >>----------------------------------------------------------------
R2# sh ip ospf database
OSPF Router with ID (200.1.1.20) (Process ID 100)
Router Link States (Area 1)
Link ID ADV Router Age Seq# Checksum Link count
200.1.1.20 200.1.1.20 1289 0x8000000C 0x00D3C6 2
200.1.1.50 200.1.1.50 1580 0x80000008 0x0074D2 1
200.1.1.250 200.1.1.250 1578 0x8000000A 0x00704C 1
Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
192.168.2.1 200.1.1.250 1578 0x80000004 0x004227
192.168.3.5 200.1.1.50 1580 0x80000007 0x0040A3
Summary Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
192.168.1.0 200.1.1.250 1578 0x80000009 0x006C91
192.168.5.0 200.1.1.250 1578 0x80000009 0x00CE69
Type-7 AS External Link States (Area 1)
Link ID ADV Router Age Seq# Checksum Tag
0.0.0.0 200.1.1.250 1578 0x80000004 0x005F1D 0
10.1.1.0 200.1.1.50 619 0x80000003 0x0071B7 0
10.1.2.0 200.1.1.50 629 0x80000001 0x006ABF 0
※タイプ1~3および7の情報のみとなっている。
よって、外部エリア(非OSPFドメイン)向けの情報は全てタイプ7のデフォルトルートを通ることが分かる。
------------<< R3 >>----------------------------------------------------------------
R3# sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
172.16.0.0/24 is subnetted, 2 subnets
C 172.16.1.0 is directly connected, FastEthernet1
R 172.16.2.0 [120/1] via 172.16.1.4, 00:00:02, FastEthernet1
192.168.5.0/26 is subnetted, 1 subnets
C 192.168.5.0 is directly connected, Loopback0
10.0.0.0/24 is subnetted, 2 subnets
O E2 10.1.2.0 [110/5] via 192.168.1.1, 00:10:57, FastEthernet0
O E2 10.1.1.0 [110/5] via 192.168.1.1, 00:10:43, FastEthernet0
C 192.168.1.0/24 is directly connected, FastEthernet0
192.168.2.0/28 is subnetted, 1 subnets
O IA 192.168.2.0 [110/2] via 192.168.1.1, 02:02:00, FastEthernet0
O IA 192.168.3.0/24 [110/3] via 192.168.1.1, 02:02:05, FastEthernet0
※小規模拠点は外部エリアとして認識されている。
------------<< R3 >>----------------------------------------------------------------
R3# sh ip ospf
Routing Process "ospf 100" with ID 200.1.1.10
Supports only single TOS(TOS0) routes
Supports opaque LSA
Supports Link-local Signaling (LLS)
Supports area transit capability
It is an area border and autonomous system boundary router
Redistributing External Routes from,
rip, includes subnets in redistribution
Initial SPF schedule delay 5000 msecs
Minimum hold time between two consecutive SPFs 10000 msecs
Maximum wait time between two consecutive SPFs 10000 msecs
Incremental-SPF disabled
Minimum LSA interval 5 secs
Minimum LSA arrival 1000 msecs
LSA group pacing timer 240 secs
Interface flood pacing timer 33 msecs
Retransmission pacing timer 66 msecs
Number of external LSA 4. Checksum Sum 0x01D2C1
Number of opaque AS LSA 0. Checksum Sum 0x000000
Number of DCbitless external and opaque AS LSA 0
Number of DoNotAge external and opaque AS LSA 0
Number of areas in this router is 2. 2 normal 0 stub 0 nssa
Number of areas transit capable is 0
External flood list length 0
IETF NSF helper support enabled
Cisco NSF helper support enabled
Area BACKBONE(0)
Number of interfaces in this area is 1
Area has no authentication
SPF algorithm last executed 02:02:56.888 ago
SPF algorithm executed 16 times
Area ranges are
Number of LSA 6. Checksum Sum 0x03F028
Number of opaque link LSA 0. Checksum Sum 0x000000
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
Area 2
Number of interfaces in this area is 1
Area has no authentication
SPF algorithm last executed 03:58:05.836 ago
SPF algorithm executed 10 times
Area ranges are
Number of LSA 5. Checksum Sum 0x0182FE
Number of opaque link LSA 0. Checksum Sum 0x000000
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
------------<< R3 >>----------------------------------------------------------------
R3# sh ip ospf database
OSPF Router with ID (200.1.1.10) (Process ID 100)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
200.1.1.10 200.1.1.10 219 0x80000060 0x00331B 1
200.1.1.250 200.1.1.250 1672 0x8000000A 0x00B410 1
Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
192.168.1.1 200.1.1.250 139 0x8000005A 0x00C84C
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
192.168.2.0 200.1.1.250 1672 0x8000005D 0x00B805
192.168.3.0 200.1.1.250 1672 0x80000004 0x00C441
192.168.5.0 200.1.1.10 219 0x80000009 0x00C46B
Router Link States (Area 2)
Link ID ADV Router Age Seq# Checksum Link count
200.1.1.10 200.1.1.10 219 0x8000005E 0x008375 1
Summary Net Link States (Area 2)
Link ID ADV Router Age Seq# Checksum
192.168.1.0 200.1.1.10 221 0x8000000A 0x006A89
192.168.2.0 200.1.1.10 1465 0x80000009 0x0011F0
192.168.3.0 200.1.1.10 1465 0x80000004 0x007481
Summary ASB Link States (Area 2)
Link ID ADV Router Age Seq# Checksum
200.1.1.250 200.1.1.10 1465 0x80000004 0x000E8F
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
10.1.1.0 200.1.1.250 707 0x80000003 0x005119 0
10.1.2.0 200.1.1.250 722 0x80000001 0x004A21 0
172.16.1.0 200.1.1.10 1210 0x80000059 0x004C69 0
172.16.2.0 200.1.1.10 967 0x80000004 0x00EB1E 0
------------<< R4 >>----------------------------------------------------------------
R4# sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
172.16.0.0/24 is subnetted, 2 subnets
C 172.16.1.0 is directly connected, FastEthernet0
C 172.16.2.0 is directly connected, Loopback0
192.168.5.0/26 is subnetted, 1 subnets
R 192.168.5.0 [120/5] via 172.16.1.3, 00:00:12, FastEthernet0
10.0.0.0/24 is subnetted, 2 subnets
R 10.1.2.0 [120/5] via 172.16.1.3, 00:00:12, FastEthernet0
R 10.1.1.0 [120/5] via 172.16.1.3, 00:00:12, FastEthernet0
R 192.168.1.0/24 [120/5] via 172.16.1.3, 00:00:12, FastEthernet0
192.168.2.0/28 is subnetted, 1 subnets
R 192.168.2.0 [120/5] via 172.16.1.3, 00:00:13, FastEthernet0
R 192.168.3.0/24 [120/5] via 172.16.1.3, 00:00:13, FastEthernet0
------------<< R4 >>----------------------------------------------------------------
R4# sh ip rip database
10.0.0.0/8 auto-summary
10.1.1.0/24
[5] via 172.16.1.3, 00:00:12, FastEthernet0
10.1.2.0/24
[5] via 172.16.1.3, 00:00:12, FastEthernet0
172.16.0.0/16 auto-summary
172.16.1.0/24 directly connected, FastEthernet0
172.16.2.0/24 directly connected, Loopback0
192.168.1.0/24 auto-summary
192.168.1.0/24
[5] via 172.16.1.3, 00:00:12, FastEthernet0
192.168.2.0/24 auto-summary
192.168.2.0/28
[5] via 172.16.1.3, 00:00:12, FastEthernet0
192.168.3.0/24 auto-summary
192.168.3.0/24
[5] via 172.16.1.3, 00:00:12, FastEthernet0
192.168.5.0/24 auto-summary
192.168.5.0/26
[5] via 172.16.1.3, 00:00:12, FastEthernet0
------------<< R5 >>----------------------------------------------------------------
R5# sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is 192.168.3.2 to network 0.0.0.0
192.168.5.0/26 is subnetted, 1 subnets
O IA 192.168.5.0 [110/4] via 192.168.3.2, 02:04:41, FastEthernet0
10.0.0.0/24 is subnetted, 2 subnets
R 10.1.2.0 [120/1] via 10.1.1.6, 00:00:11, FastEthernet1
C 10.1.1.0 is directly connected, FastEthernet1
O IA 192.168.1.0/24 [110/3] via 192.168.3.2, 02:04:41, FastEthernet0
192.168.2.0/28 is subnetted, 1 subnets
O 192.168.2.0 [110/2] via 192.168.3.2, 02:04:41, FastEthernet0
C 192.168.3.0/24 is directly connected, FastEthernet0
O*N2 0.0.0.0/0 [110/1] via 192.168.3.2, 02:04:42, FastEthernet0
------------<< R5 >>----------------------------------------------------------------
R5# sh ip ospf
Routing Process "ospf 100" with ID 200.1.1.50
Supports only single TOS(TOS0) routes
Supports opaque LSA
Supports Link-local Signaling (LLS)
Supports area transit capability
It is an autonomous system boundary router
Redistributing External Routes from,
rip with metric mapped to 5, includes subnets in redistribution
Initial SPF schedule delay 5000 msecs
Minimum hold time between two consecutive SPFs 10000 msecs
Maximum wait time between two consecutive SPFs 10000 msecs
Incremental-SPF disabled
Minimum LSA interval 5 secs
Minimum LSA arrival 1000 msecs
LSA group pacing timer 240 secs
Interface flood pacing timer 33 msecs
Retransmission pacing timer 66 msecs
Number of external LSA 0. Checksum Sum 0x000000
Number of opaque AS LSA 0. Checksum Sum 0x000000
Number of DCbitless external and opaque AS LSA 0
Number of DoNotAge external and opaque AS LSA 0
Number of areas in this router is 1. 0 normal 0 stub 1 nssa
Number of areas transit capable is 0
External flood list length 0
IETF NSF helper support enabled
Cisco NSF helper support enabled
Area 1
Number of interfaces in this area is 1
It is a NSSA area
Area has no authentication
SPF algorithm last executed 02:05:06.288 ago
SPF algorithm executed 7 times
Area ranges are
Number of LSA 10. Checksum Sum 0x04B23B
Number of opaque link LSA 0. Checksum Sum 0x000000
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
※RIP→OSPFへ再配送が定義されていることが分かる。
------------<< R5 >>----------------------------------------------------------------
R5# sh ip ospf database
OSPF Router with ID (200.1.1.50) (Process ID 100)
Router Link States (Area 1)
Link ID ADV Router Age Seq# Checksum Link count
200.1.1.20 200.1.1.20 1529 0x8000000C 0x00D3C6 2
200.1.1.50 200.1.1.50 1818 0x80000008 0x0074D2 1
200.1.1.250 200.1.1.250 1819 0x8000000A 0x00704C 1
Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
192.168.2.1 200.1.1.250 1819 0x80000004 0x004227
192.168.3.5 200.1.1.50 1818 0x80000007 0x0040A3
Summary Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
192.168.1.0 200.1.1.250 1819 0x80000009 0x006C91
192.168.5.0 200.1.1.250 1819 0x80000009 0x00CE69
Type-7 AS External Link States (Area 1)
Link ID ADV Router Age Seq# Checksum Tag
0.0.0.0 200.1.1.250 1819 0x80000004 0x005F1D 0
10.1.1.0 200.1.1.50 857 0x80000003 0x0071B7 0
10.1.2.0 200.1.1.50 866 0x80000001 0x006ABF 0
------------<< R6 >>----------------------------------------------------------------
R6# sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is 10.1.1.5 to network 0.0.0.0
192.168.5.0/26 is subnetted, 1 subnets
R 192.168.5.0 [120/5] via 10.1.1.5, 00:00:08, FastEthernet0
10.0.0.0/24 is subnetted, 2 subnets
C 10.1.2.0 is directly connected, Loopback0
C 10.1.1.0 is directly connected, FastEthernet0
R 192.168.1.0/24 [120/5] via 10.1.1.5, 00:00:08, FastEthernet0
192.168.2.0/28 is subnetted, 1 subnets
R 192.168.2.0 [120/5] via 10.1.1.5, 00:00:08, FastEthernet0
R 192.168.3.0/24 [120/5] via 10.1.1.5, 00:00:08, FastEthernet0
R* 0.0.0.0/0 [120/5] via 10.1.1.5, 00:00:10, FastEthernet0
※RIPドメイン(172.16.0.0)は外部エリアなのでデフォルトルートとしてアドバタイズされている。
------------<< R6 >>----------------------------------------------------------------
R6# sh ip rip database
0.0.0.0/0 auto-summary
0.0.0.0/0
[5] via 10.1.1.5, 00:00:08, FastEthernet0
10.0.0.0/8 auto-summary
10.1.1.0/24 directly connected, FastEthernet0
10.1.2.0/24 directly connected, Loopback0
192.168.1.0/24 auto-summary
192.168.1.0/24
[5] via 10.1.1.5, 00:00:08, FastEthernet0
192.168.2.0/24 auto-summary
192.168.2.0/28
[5] via 10.1.1.5, 00:00:08, FastEthernet0
192.168.3.0/24 auto-summary
192.168.3.0/24
[5] via 10.1.1.5, 00:00:08, FastEthernet0
192.168.5.0/24 auto-summary
192.168.5.0/26
[5] via 10.1.1.5, 00:00:08, FastEthernet0
以上(´・ω・`)貼り付けまくりでした。
→「OSPFネットワーク構築その5 トータリーNSSA」へ
R1(config)# router ospf 100
R1(config-router)# area 1 nssa default-information-originate
※構築時に「default-information-originate」を追加し忘れたため、
NSSA内エリアにデフォルトルートがアドバタイズされず、他エリアへのPingが通らなくて焦ったw
R2(config)# router ospf 100
R2(config-router)# area 1 nssa
◇NSSA内ASBRルータR5の設定
R5> enable
R5# conf t
R5(config)# hostname R5
R5(config)# interface fa 0
R5(config-if)# ip address 192.168.3.5 255.255.255.0
R5(config-if)# no shutdown
R5(config-if)# interface fa 1
R5(config-if)# ip address 10.1.1.5 255.255.255.0
R5(config-if)# no shutdown
R5(config-if)# exit
R5(config)# router ospf 100
R5(config-router)# redistribute rip metric 5 subnets
R5(config-router)# router-id 200.1.1.50
R5(config-router)# area 1 nssa //NSSAの設定
R5(config-router)# network 192.168.3.0 0.0.0.255 area 1
R5(config-router)# exit
R5(config)# router rip
R5(config-router)# version 2
R5(config-router)# redistribute ospf 100 metric 5 //再配送の設定(OSPF→RIP)
R5(config-router)# network 10.1.0.0
R5(config-router)# no auto-summary
R5(config-router)# end
R5# copy running-config startup-config
◇小規模拠点のルータR6の設定
R6> enable
R6# conf t
R6(config)# hostname R6
R6(config-if)# interface fa 0
R6(config-if)# ip address 10.1.1.6 255.255.255.0
R6(config-if)# no shutdown
R6(config-if)# interface lo 0
R6(config-if)# ip address 10.1.2.6 255.255.255.0
R6(config-if)# no shutdown
R6(config-if)# exit
R6(config)# router rip
R6(config-router)# version 2
R6(config-router)# network 10.1.0.0
R6(config-router)# no auto-summary
R6(config-router)# end
R6# copy running-config startup-config
設定が終わったらルーティングテーブルおよびLSAタイプを確認する。
------------<< R1 >>----------------------------------------------------------------
R1# sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
172.16.0.0/24 is subnetted, 2 subnets
O E2 172.16.1.0 [110/20] via 192.168.1.3, 01:52:04, FastEthernet0
O E2 172.16.2.0 [110/20] via 192.168.1.3, 01:51:02, FastEthernet0
192.168.5.0/26 is subnetted, 1 subnets
O IA 192.168.5.0 [110/2] via 192.168.1.3, 01:57:26, FastEthernet0
10.0.0.0/24 is subnetted, 2 subnets
O N2 10.1.2.0 [110/5] via 192.168.2.2, 00:06:20, FastEthernet1
O N2 10.1.1.0 [110/5] via 192.168.2.2, 00:06:10, FastEthernet1
C 192.168.1.0/24 is directly connected, FastEthernet0
192.168.2.0/28 is subnetted, 1 subnets
C 192.168.2.0 is directly connected, FastEthernet1
O 192.168.3.0/24 [110/2] via 192.168.2.2, 01:57:27, FastEthernet1
※小規模ドメインはOSPF NSSA external type 2からのルートとして載っている。
------------<< R1 >>----------------------------------------------------------------
R1# sh ip ospf
Routing Process "ospf 100" with ID 200.1.1.250
Supports only single TOS(TOS0) routes
Supports opaque LSA
Supports Link-local Signaling (LLS)
Supports area transit capability
It is an area border and autonomous system boundary router
Redistributing External Routes from,
Initial SPF schedule delay 5000 msecs
Minimum hold time between two consecutive SPFs 10000 msecs
Maximum wait time between two consecutive SPFs 10000 msecs
Incremental-SPF disabled
Minimum LSA interval 5 secs
Minimum LSA arrival 1000 msecs
LSA group pacing timer 240 secs
Interface flood pacing timer 33 msecs
Retransmission pacing timer 66 msecs
Number of external LSA 4. Checksum Sum 0x01D2C1
Number of opaque AS LSA 0. Checksum Sum 0x000000
Number of DCbitless external and opaque AS LSA 0
Number of DoNotAge external and opaque AS LSA 0
Number of areas in this router is 2. 1 normal 0 stub 1 nssa
Number of areas transit capable is 0
External flood list length 0
IETF NSF helper support enabled
Cisco NSF helper support enabled
Area BACKBONE(0)
Number of interfaces in this area is 1
Area has no authentication
SPF algorithm last executed 01:57:51.232 ago
SPF algorithm executed 11 times
Area ranges are
Number of LSA 6. Checksum Sum 0x03F625
Number of opaque link LSA 0. Checksum Sum 0x000000
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
Area 1
Number of interfaces in this area is 1
It is a NSSA area
Perform type-7/type-5 LSA translation
generates NSSA default route with cost 1
Area has no authentication
SPF algorithm last executed 01:57:41.232 ago
SPF algorithm executed 10 times
Area ranges are
Number of LSA 10. Checksum Sum 0x04B23B
Number of opaque link LSA 0. Checksum Sum 0x000000
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
※LSAタイプ7をタイプ5に変換する旨の表記があることが分かる。
------------<< R1 >>----------------------------------------------------------------
R1# sh ip ospf database
OSPF Router with ID (200.1.1.250) (Process ID 100)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
200.1.1.10 200.1.1.10 1893 0x8000005F 0x00351A 1
200.1.1.250 200.1.1.250 1374 0x8000000A 0x00B410 1
Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
192.168.1.1 200.1.1.250 1884 0x80000059 0x00CA4B
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
192.168.2.0 200.1.1.250 1374 0x8000005D 0x00B805
192.168.3.0 200.1.1.250 1374 0x80000004 0x00C441
192.168.5.0 200.1.1.10 1893 0x80000008 0x00C66A
Router Link States (Area 1)
Link ID ADV Router Age Seq# Checksum Link count
200.1.1.20 200.1.1.20 1086 0x8000000C 0x00D3C6 2
200.1.1.50 200.1.1.50 1379 0x80000008 0x0074D2 1
200.1.1.250 200.1.1.250 1375 0x8000000A 0x00704C 1
Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
192.168.2.1 200.1.1.250 1375 0x80000004 0x004227
192.168.3.5 200.1.1.50 1379 0x80000007 0x0040A3
Summary Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
192.168.1.0 200.1.1.250 1375 0x80000009 0x006C91
192.168.5.0 200.1.1.250 1375 0x80000009 0x00CE69
Type-7 AS External Link States (Area 1)
Link ID ADV Router Age Seq# Checksum Tag
0.0.0.0 200.1.1.250 1375 0x80000004 0x005F1D 0
10.1.1.0 200.1.1.50 417 0x80000003 0x0071B7 0
10.1.2.0 200.1.1.50 428 0x80000001 0x006ABF 0
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
10.1.1.0 200.1.1.250 411 0x80000003 0x005119 0
10.1.2.0 200.1.1.250 426 0x80000001 0x004A21 0
172.16.1.0 200.1.1.10 916 0x80000059 0x004C69 0
172.16.2.0 200.1.1.10 673 0x80000004 0x00EB1E 0
※LSDB内にタイプ7の情報があり、デフォルトルートが存在することが分かる。
------------<< R2 >>----------------------------------------------------------------
R2# sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is 192.168.2.1 to network 0.0.0.0
192.168.5.0/26 is subnetted, 1 subnets
O IA 192.168.5.0 [110/3] via 192.168.2.1, 01:59:59, FastEthernet0
10.0.0.0/24 is subnetted, 2 subnets
O N2 10.1.2.0 [110/5] via 192.168.3.5, 00:09:02, FastEthernet1
O N2 10.1.1.0 [110/5] via 192.168.3.5, 00:08:52, FastEthernet1
O IA 192.168.1.0/24 [110/2] via 192.168.2.1, 01:59:59, FastEthernet0
192.168.2.0/28 is subnetted, 1 subnets
C 192.168.2.0 is directly connected, FastEthernet0
C 192.168.3.0/24 is directly connected, FastEthernet1
O*N2 0.0.0.0/0 [110/1] via 192.168.2.1, 02:00:00, FastEthernet0
※小規模ドメインはRIP→OSPFの再配送によって、
N2 - OSPF NSSA external type 2でルート情報がアドバタイズされていることが分かる。
また、LSAタイプ7でアドバタイズされているデフォルトルートが存在している。
------------<< R2 >>----------------------------------------------------------------
R2# sh ip ospf
Routing Process "ospf 100" with ID 200.1.1.20
Supports only single TOS(TOS0) routes
Supports opaque LSA
Supports Link-local Signaling (LLS)
Supports area transit capability
Initial SPF schedule delay 5000 msecs
Minimum hold time between two consecutive SPFs 10000 msecs
Maximum wait time between two consecutive SPFs 10000 msecs
Incremental-SPF disabled
Minimum LSA interval 5 secs
Minimum LSA arrival 1000 msecs
LSA group pacing timer 240 secs
Interface flood pacing timer 33 msecs
Retransmission pacing timer 66 msecs
Number of external LSA 0. Checksum Sum 0x000000
Number of opaque AS LSA 0. Checksum Sum 0x000000
Number of DCbitless external and opaque AS LSA 0
Number of DoNotAge external and opaque AS LSA 0
Number of areas in this router is 1. 0 normal 0 stub 1 nssa
Number of areas transit capable is 0
External flood list length 0
IETF NSF helper support enabled
Cisco NSF helper support enabled
Area 1
Number of interfaces in this area is 2
It is a NSSA area
Area has no authentication
SPF algorithm last executed 02:00:47.832 ago
SPF algorithm executed 8 times
Area ranges are
Number of LSA 10. Checksum Sum 0x04B23B
Number of opaque link LSA 0. Checksum Sum 0x000000
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
------------<< R2 >>----------------------------------------------------------------
R2# sh ip ospf database
OSPF Router with ID (200.1.1.20) (Process ID 100)
Router Link States (Area 1)
Link ID ADV Router Age Seq# Checksum Link count
200.1.1.20 200.1.1.20 1289 0x8000000C 0x00D3C6 2
200.1.1.50 200.1.1.50 1580 0x80000008 0x0074D2 1
200.1.1.250 200.1.1.250 1578 0x8000000A 0x00704C 1
Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
192.168.2.1 200.1.1.250 1578 0x80000004 0x004227
192.168.3.5 200.1.1.50 1580 0x80000007 0x0040A3
Summary Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
192.168.1.0 200.1.1.250 1578 0x80000009 0x006C91
192.168.5.0 200.1.1.250 1578 0x80000009 0x00CE69
Type-7 AS External Link States (Area 1)
Link ID ADV Router Age Seq# Checksum Tag
0.0.0.0 200.1.1.250 1578 0x80000004 0x005F1D 0
10.1.1.0 200.1.1.50 619 0x80000003 0x0071B7 0
10.1.2.0 200.1.1.50 629 0x80000001 0x006ABF 0
※タイプ1~3および7の情報のみとなっている。
よって、外部エリア(非OSPFドメイン)向けの情報は全てタイプ7のデフォルトルートを通ることが分かる。
------------<< R3 >>----------------------------------------------------------------
R3# sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
172.16.0.0/24 is subnetted, 2 subnets
C 172.16.1.0 is directly connected, FastEthernet1
R 172.16.2.0 [120/1] via 172.16.1.4, 00:00:02, FastEthernet1
192.168.5.0/26 is subnetted, 1 subnets
C 192.168.5.0 is directly connected, Loopback0
10.0.0.0/24 is subnetted, 2 subnets
O E2 10.1.2.0 [110/5] via 192.168.1.1, 00:10:57, FastEthernet0
O E2 10.1.1.0 [110/5] via 192.168.1.1, 00:10:43, FastEthernet0
C 192.168.1.0/24 is directly connected, FastEthernet0
192.168.2.0/28 is subnetted, 1 subnets
O IA 192.168.2.0 [110/2] via 192.168.1.1, 02:02:00, FastEthernet0
O IA 192.168.3.0/24 [110/3] via 192.168.1.1, 02:02:05, FastEthernet0
※小規模拠点は外部エリアとして認識されている。
------------<< R3 >>----------------------------------------------------------------
R3# sh ip ospf
Routing Process "ospf 100" with ID 200.1.1.10
Supports only single TOS(TOS0) routes
Supports opaque LSA
Supports Link-local Signaling (LLS)
Supports area transit capability
It is an area border and autonomous system boundary router
Redistributing External Routes from,
rip, includes subnets in redistribution
Initial SPF schedule delay 5000 msecs
Minimum hold time between two consecutive SPFs 10000 msecs
Maximum wait time between two consecutive SPFs 10000 msecs
Incremental-SPF disabled
Minimum LSA interval 5 secs
Minimum LSA arrival 1000 msecs
LSA group pacing timer 240 secs
Interface flood pacing timer 33 msecs
Retransmission pacing timer 66 msecs
Number of external LSA 4. Checksum Sum 0x01D2C1
Number of opaque AS LSA 0. Checksum Sum 0x000000
Number of DCbitless external and opaque AS LSA 0
Number of DoNotAge external and opaque AS LSA 0
Number of areas in this router is 2. 2 normal 0 stub 0 nssa
Number of areas transit capable is 0
External flood list length 0
IETF NSF helper support enabled
Cisco NSF helper support enabled
Area BACKBONE(0)
Number of interfaces in this area is 1
Area has no authentication
SPF algorithm last executed 02:02:56.888 ago
SPF algorithm executed 16 times
Area ranges are
Number of LSA 6. Checksum Sum 0x03F028
Number of opaque link LSA 0. Checksum Sum 0x000000
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
Area 2
Number of interfaces in this area is 1
Area has no authentication
SPF algorithm last executed 03:58:05.836 ago
SPF algorithm executed 10 times
Area ranges are
Number of LSA 5. Checksum Sum 0x0182FE
Number of opaque link LSA 0. Checksum Sum 0x000000
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
------------<< R3 >>----------------------------------------------------------------
R3# sh ip ospf database
OSPF Router with ID (200.1.1.10) (Process ID 100)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
200.1.1.10 200.1.1.10 219 0x80000060 0x00331B 1
200.1.1.250 200.1.1.250 1672 0x8000000A 0x00B410 1
Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
192.168.1.1 200.1.1.250 139 0x8000005A 0x00C84C
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
192.168.2.0 200.1.1.250 1672 0x8000005D 0x00B805
192.168.3.0 200.1.1.250 1672 0x80000004 0x00C441
192.168.5.0 200.1.1.10 219 0x80000009 0x00C46B
Router Link States (Area 2)
Link ID ADV Router Age Seq# Checksum Link count
200.1.1.10 200.1.1.10 219 0x8000005E 0x008375 1
Summary Net Link States (Area 2)
Link ID ADV Router Age Seq# Checksum
192.168.1.0 200.1.1.10 221 0x8000000A 0x006A89
192.168.2.0 200.1.1.10 1465 0x80000009 0x0011F0
192.168.3.0 200.1.1.10 1465 0x80000004 0x007481
Summary ASB Link States (Area 2)
Link ID ADV Router Age Seq# Checksum
200.1.1.250 200.1.1.10 1465 0x80000004 0x000E8F
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
10.1.1.0 200.1.1.250 707 0x80000003 0x005119 0
10.1.2.0 200.1.1.250 722 0x80000001 0x004A21 0
172.16.1.0 200.1.1.10 1210 0x80000059 0x004C69 0
172.16.2.0 200.1.1.10 967 0x80000004 0x00EB1E 0
------------<< R4 >>----------------------------------------------------------------
R4# sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
172.16.0.0/24 is subnetted, 2 subnets
C 172.16.1.0 is directly connected, FastEthernet0
C 172.16.2.0 is directly connected, Loopback0
192.168.5.0/26 is subnetted, 1 subnets
R 192.168.5.0 [120/5] via 172.16.1.3, 00:00:12, FastEthernet0
10.0.0.0/24 is subnetted, 2 subnets
R 10.1.2.0 [120/5] via 172.16.1.3, 00:00:12, FastEthernet0
R 10.1.1.0 [120/5] via 172.16.1.3, 00:00:12, FastEthernet0
R 192.168.1.0/24 [120/5] via 172.16.1.3, 00:00:12, FastEthernet0
192.168.2.0/28 is subnetted, 1 subnets
R 192.168.2.0 [120/5] via 172.16.1.3, 00:00:13, FastEthernet0
R 192.168.3.0/24 [120/5] via 172.16.1.3, 00:00:13, FastEthernet0
------------<< R4 >>----------------------------------------------------------------
R4# sh ip rip database
10.0.0.0/8 auto-summary
10.1.1.0/24
[5] via 172.16.1.3, 00:00:12, FastEthernet0
10.1.2.0/24
[5] via 172.16.1.3, 00:00:12, FastEthernet0
172.16.0.0/16 auto-summary
172.16.1.0/24 directly connected, FastEthernet0
172.16.2.0/24 directly connected, Loopback0
192.168.1.0/24 auto-summary
192.168.1.0/24
[5] via 172.16.1.3, 00:00:12, FastEthernet0
192.168.2.0/24 auto-summary
192.168.2.0/28
[5] via 172.16.1.3, 00:00:12, FastEthernet0
192.168.3.0/24 auto-summary
192.168.3.0/24
[5] via 172.16.1.3, 00:00:12, FastEthernet0
192.168.5.0/24 auto-summary
192.168.5.0/26
[5] via 172.16.1.3, 00:00:12, FastEthernet0
------------<< R5 >>----------------------------------------------------------------
R5# sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is 192.168.3.2 to network 0.0.0.0
192.168.5.0/26 is subnetted, 1 subnets
O IA 192.168.5.0 [110/4] via 192.168.3.2, 02:04:41, FastEthernet0
10.0.0.0/24 is subnetted, 2 subnets
R 10.1.2.0 [120/1] via 10.1.1.6, 00:00:11, FastEthernet1
C 10.1.1.0 is directly connected, FastEthernet1
O IA 192.168.1.0/24 [110/3] via 192.168.3.2, 02:04:41, FastEthernet0
192.168.2.0/28 is subnetted, 1 subnets
O 192.168.2.0 [110/2] via 192.168.3.2, 02:04:41, FastEthernet0
C 192.168.3.0/24 is directly connected, FastEthernet0
O*N2 0.0.0.0/0 [110/1] via 192.168.3.2, 02:04:42, FastEthernet0
------------<< R5 >>----------------------------------------------------------------
R5# sh ip ospf
Routing Process "ospf 100" with ID 200.1.1.50
Supports only single TOS(TOS0) routes
Supports opaque LSA
Supports Link-local Signaling (LLS)
Supports area transit capability
It is an autonomous system boundary router
Redistributing External Routes from,
rip with metric mapped to 5, includes subnets in redistribution
Initial SPF schedule delay 5000 msecs
Minimum hold time between two consecutive SPFs 10000 msecs
Maximum wait time between two consecutive SPFs 10000 msecs
Incremental-SPF disabled
Minimum LSA interval 5 secs
Minimum LSA arrival 1000 msecs
LSA group pacing timer 240 secs
Interface flood pacing timer 33 msecs
Retransmission pacing timer 66 msecs
Number of external LSA 0. Checksum Sum 0x000000
Number of opaque AS LSA 0. Checksum Sum 0x000000
Number of DCbitless external and opaque AS LSA 0
Number of DoNotAge external and opaque AS LSA 0
Number of areas in this router is 1. 0 normal 0 stub 1 nssa
Number of areas transit capable is 0
External flood list length 0
IETF NSF helper support enabled
Cisco NSF helper support enabled
Area 1
Number of interfaces in this area is 1
It is a NSSA area
Area has no authentication
SPF algorithm last executed 02:05:06.288 ago
SPF algorithm executed 7 times
Area ranges are
Number of LSA 10. Checksum Sum 0x04B23B
Number of opaque link LSA 0. Checksum Sum 0x000000
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
※RIP→OSPFへ再配送が定義されていることが分かる。
------------<< R5 >>----------------------------------------------------------------
R5# sh ip ospf database
OSPF Router with ID (200.1.1.50) (Process ID 100)
Router Link States (Area 1)
Link ID ADV Router Age Seq# Checksum Link count
200.1.1.20 200.1.1.20 1529 0x8000000C 0x00D3C6 2
200.1.1.50 200.1.1.50 1818 0x80000008 0x0074D2 1
200.1.1.250 200.1.1.250 1819 0x8000000A 0x00704C 1
Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
192.168.2.1 200.1.1.250 1819 0x80000004 0x004227
192.168.3.5 200.1.1.50 1818 0x80000007 0x0040A3
Summary Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
192.168.1.0 200.1.1.250 1819 0x80000009 0x006C91
192.168.5.0 200.1.1.250 1819 0x80000009 0x00CE69
Type-7 AS External Link States (Area 1)
Link ID ADV Router Age Seq# Checksum Tag
0.0.0.0 200.1.1.250 1819 0x80000004 0x005F1D 0
10.1.1.0 200.1.1.50 857 0x80000003 0x0071B7 0
10.1.2.0 200.1.1.50 866 0x80000001 0x006ABF 0
------------<< R6 >>----------------------------------------------------------------
R6# sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is 10.1.1.5 to network 0.0.0.0
192.168.5.0/26 is subnetted, 1 subnets
R 192.168.5.0 [120/5] via 10.1.1.5, 00:00:08, FastEthernet0
10.0.0.0/24 is subnetted, 2 subnets
C 10.1.2.0 is directly connected, Loopback0
C 10.1.1.0 is directly connected, FastEthernet0
R 192.168.1.0/24 [120/5] via 10.1.1.5, 00:00:08, FastEthernet0
192.168.2.0/28 is subnetted, 1 subnets
R 192.168.2.0 [120/5] via 10.1.1.5, 00:00:08, FastEthernet0
R 192.168.3.0/24 [120/5] via 10.1.1.5, 00:00:08, FastEthernet0
R* 0.0.0.0/0 [120/5] via 10.1.1.5, 00:00:10, FastEthernet0
※RIPドメイン(172.16.0.0)は外部エリアなのでデフォルトルートとしてアドバタイズされている。
------------<< R6 >>----------------------------------------------------------------
R6# sh ip rip database
0.0.0.0/0 auto-summary
0.0.0.0/0
[5] via 10.1.1.5, 00:00:08, FastEthernet0
10.0.0.0/8 auto-summary
10.1.1.0/24 directly connected, FastEthernet0
10.1.2.0/24 directly connected, Loopback0
192.168.1.0/24 auto-summary
192.168.1.0/24
[5] via 10.1.1.5, 00:00:08, FastEthernet0
192.168.2.0/24 auto-summary
192.168.2.0/28
[5] via 10.1.1.5, 00:00:08, FastEthernet0
192.168.3.0/24 auto-summary
192.168.3.0/24
[5] via 10.1.1.5, 00:00:08, FastEthernet0
192.168.5.0/24 auto-summary
192.168.5.0/26
[5] via 10.1.1.5, 00:00:08, FastEthernet0
以上(´・ω・`)貼り付けまくりでした。
→「OSPFネットワーク構築その5 トータリーNSSA」へ
PR
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