ospf-filtering-issue - Partial Topology.pdf
- 1. Partial Topology NOTE: 10.10.98.x networks are in area 0 to the right of the diagram R1#show ip int bri | exc una Interface IP-Address OK? Method Status Protocol FastEthernet0/0 10.10.12.1 YES manual up up Serial0/0.301 10.10.13.1 YES manual up up Serial0/0.302 10.10.14.1 YES manual up up Serial0/0.303 10.10.15.1 YES manual up up FastEthernet0/1 10.10.17.1 YES manual up up FastEthernet1/0 10.10.18.1 YES manual up up R1#show ip prefix-list ip prefix-list OSPF-0-FILTER-OUT: 2 entries seq 5 deny 10.10.98.20/30 seq 10 permit 0.0.0.0/0 le 32 R1#show run | sec router ospf 200 router ospf 200 router-id 1.1.1.1 log-adjacency-changes area 0 authentication message-digest area 0 filter-list prefix OSPF-0-FILTER-OUT out area 5 authentication message-digest area 34 authentication message-digest passive-interface default no passive-interface FastEthernet0/0 no passive-interface Serial0/0.301 no passive-interface Serial0/0.302 no passive-interface Serial0/0.303
- 2. no passive-interface FastEthernet0/1 no passive-interface FastEthernet1/0 R1#show ip ospf 200 Routing Process "ospf 200" with ID 1.1.1.1 Start time: 00:04:00.016, Time elapsed: 00:58:57.944 Supports only single TOS(TOS0) routes Supports opaque LSA Supports Link-local Signaling (LLS) Supports area transit capability It is an area border router Router is not originating router-LSAs with maximum metric 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 3. 3 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 3 Area has message digest authentication SPF algorithm last executed 00:33:59.936 ago SPF algorithm executed 13 times Area ranges are Area-filter OSPF-0-FILTER-OUT out Number of LSA 26. Checksum Sum 0x0B88C9 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 5 Number of interfaces in this area is 1 Area has message digest authentication SPF algorithm last executed 00:51:01.008 ago SPF algorithm executed 4 times Area ranges are Number of LSA 15. Checksum Sum 0x0881BC 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 34 Number of interfaces in this area is 2 Area has message digest authentication SPF algorithm last executed 00:42:02.324 ago SPF algorithm executed 10 times Area ranges are Number of LSA 27. Checksum Sum 0x0E5BD1 Number of opaque link LSA 0. Checksum Sum 0x000000
- 3. Number of DCbitless LSA 0 Number of indication LSA 0 Number of DoNotAge LSA 0 Flood list length 0 R2#show ip int bri | exc una Interface IP-Address OK? Method Status Protocol FastEthernet0/0 10.10.12.2 YES manual up up Serial0/0.401 10.10.23.2 YES manual up up Serial0/0.402 10.10.24.2 YES manual up up Serial0/0.403 10.10.25.2 YES manual up up FastEthernet0/1 10.10.28.2 YES manual up up FastEthernet1/0 10.10.27.2 YES manual up up R2#show ip prefix-list ip prefix-list OSPF-34-FILTER-IN: 2 entries seq 5 deny 10.10.98.16/30 seq 10 permit 0.0.0.0/0 le 32 R2#show run | sec router ospf 200 router ospf 200 router-id 2.2.2.2 log-adjacency-changes area 0 authentication message-digest area 5 authentication message-digest area 34 authentication message-digest area 34 filter-list prefix OSPF-34-FILTER-IN in passive-interface default no passive-interface FastEthernet0/0 no passive-interface Serial0/0.401 no passive-interface Serial0/0.402 no passive-interface Serial0/0.403 no passive-interface FastEthernet0/1 no passive-interface FastEthernet1/0 R2#show ip ospf 200 Routing Process "ospf 200" with ID 2.2.2.2 Start time: 00:04:40.180, Time elapsed: 00:59:45.096 Supports only single TOS(TOS0) routes Supports opaque LSA Supports Link-local Signaling (LLS) Supports area transit capability It is an area border router Router is not originating router-LSAs with maximum metric 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 3. 3 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
- 4. Area BACKBONE(0) Number of interfaces in this area is 3 Area has message digest authentication SPF algorithm last executed 00:18:41.016 ago SPF algorithm executed 14 times Area ranges are Number of LSA 26. Checksum Sum 0x0B88C9 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 5 Number of interfaces in this area is 1 Area has message digest authentication SPF algorithm last executed 00:18:41.024 ago SPF algorithm executed 4 times Area ranges are Number of LSA 17. Checksum Sum 0x098DAF 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 34 Number of interfaces in this area is 2 Area has message digest authentication SPF algorithm last executed 00:43:40.352 ago SPF algorithm executed 6 times Area ranges are Area-filter OSPF-34-FILTER-IN in Number of LSA 27. Checksum Sum 0x0E5BD1 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#show ip ospf database summary 10.10.98.16 OSPF Router with ID (3.3.3.3) (Process ID 200) Summary Net Link States (Area 34) Routing Bit Set on this LSA LS age: 1150 Options: (No TOS-capability, DC, Upward) LS Type: Summary Links(Network) Link State ID: 10.10.98.16 (summary Network Number) Advertising Router: 1.1.1.1 LS Seq Number: 80000002 Checksum: 0x951D Length: 28 Network Mask: /30 TOS: 0 Metric: 2 R3#show ip ospf database summary 10.10.98.20 OSPF Router with ID (3.3.3.3) (Process ID 200) Summary Net Link States (Area 34) Routing Bit Set on this LSA
- 5. LS age: 1359 Options: (No TOS-capability, DC, Upward) LS Type: Summary Links(Network) Link State ID: 10.10.98.20 (summary Network Number) Advertising Router: 2.2.2.2 LS Seq Number: 80000002 Checksum: 0x4F5B Length: 28 Network Mask: /30 TOS: 0 Metric: 2 R4#show ip ospf database summary 10.10.98.16 OSPF Router with ID (4.4.4.4) (Process ID 200) Summary Net Link States (Area 34) Routing Bit Set on this LSA LS age: 1200 Options: (No TOS-capability, DC, Upward) LS Type: Summary Links(Network) Link State ID: 10.10.98.16 (summary Network Number) Advertising Router: 1.1.1.1 LS Seq Number: 80000002 Checksum: 0x951D Length: 28 Network Mask: /30 TOS: 0 Metric: 2 R4#show ip ospf database summary 10.10.98.20 OSPF Router with ID (4.4.4.4) (Process ID 200) Summary Net Link States (Area 34) Routing Bit Set on this LSA LS age: 1403 Options: (No TOS-capability, DC, Upward) LS Type: Summary Links(Network) Link State ID: 10.10.98.20 (summary Network Number) Advertising Router: 2.2.2.2 LS Seq Number: 80000002 Checksum: 0x4F5B Length: 28 Network Mask: /30 TOS: 0 Metric: 2 R3#show ip route 10.10.98.16 Routing entry for 10.10.98.16/30 Known via "ospf 200", distance 110, metric 66, type inter area Last update from 10.10.13.1 on Serial0/0.103, 00:53:27 ago Routing Descriptor Blocks: * 10.10.13.1, from 1.1.1.1, 00:53:27 ago, via Serial0/0.103 Route metric is 66, traffic share count is 1 R3#show ip route 10.10.98.20 Routing entry for 10.10.98.20/30 Known via "ospf 200", distance 110, metric 76, type inter area Last update from 10.10.34.4 on FastEthernet0/0, 00:37:18 ago Routing Descriptor Blocks: * 10.10.34.4, from 2.2.2.2, 00:37:18 ago, via FastEthernet0/0 Route metric is 76, traffic share count is 1
- 6. R4#show ip route 10.10.98.16 Routing entry for 10.10.98.16/30 Known via "ospf 200", distance 110, metric 66, type inter area Last update from 10.10.14.1 on Serial0/0.203, 00:45:48 ago Routing Descriptor Blocks: * 10.10.14.1, from 1.1.1.1, 00:53:14 ago, via Serial0/0.203 Route metric is 66, traffic share count is 1 R4#show ip route 10.10.98.20 Routing entry for 10.10.98.20/30 Known via "ospf 200", distance 110, metric 66, type inter area Last update from 10.10.24.2 on Serial0/0.204, 00:45:54 ago Routing Descriptor Blocks: * 10.10.24.2, from 2.2.2.2, 00:45:54 ago, via Serial0/0.204 Route metric is 66, traffic share count is 1