Amit, Do you have an adjacency over tunnel 0? It's not enough just to build the tunnel. Put the tunnel in Area 0 otherwise R3 is still not connected to Area 0. If the interface is advertised but there is no adjacency then you have a partitioned area 0.
On Tue, Sep 15, 2009 at 11:00 PM, amit chopra <[email protected]>wrote: > Guys > > I am facing a strange issue with below topology in OSPF: The same has been > posted on internetworkexpert forum (http://ieoc.com/forums/t/8231.aspx) but > as usual no reply by anyone so I am posting this problem here as well , hope > someone help. > > (R1 s0/0)------*AREA 0* ------------s0/0 (R2 F0/1)----------------*AREA 1- > *----------(F0/1 R3)-----------*AREA 2*----------- (R4) > 192.168.12.0/24 > 192.168.24.0/24 > > > As you can see that R4 is not connected to backbone router therefore it is > require virtual link or tunnel. > for this configuration , I used tunnel to configure between R2 and R3 > > Below is the config :- > > R2 - > > interface Tunnel0 > ip address 22.22.22.22 255.255.255.0 > ip ospf network broadcast > tunnel source 192.168.23.2 > tunnel destination 192.168.23.3 > end > > > R3 > > interface Tunnel0 > ip address 33.33.33.33 255.255.255.0 > ip ospf network broadcast > tunnel source 192.168.23.3 > tunnel destination 192.168.23.2 > end > > The 22.22.22.22 and 33.33.33.33 has been advertise into (tunnel IP) AREA 0 > : > > > R2#sh run | sec router ospf > router ospf 1 > router-id 2.2.2.2 > log-adjacency-changes > network 2.2.2.2 0.0.0.0 area 1 > network 22.22.22.22 0.0.0.0 area 0 > network 192.168.12.2 0.0.0.0 area 0 > network 192.168.23.2 0.0.0.0 area 1 > > > Now the issue is that , I am able to ping 22.22.22.22 address from router > R3 but not able to do ping 33.33.33.33 > from R2 , The tunnel is up both end side. > > if I check the ospf database on R2 for network 33.33.33.0/24 , you can see > that it is there in database but > not in routing table as ROUTING BIT IS NOT SET > > R2#show ip ospf database sum 33.33.33.0 > > OSPF Router with ID (2.2.2.2) (Process ID 1) > > Summary Net Link States (Area 1) > > LS age: 48 > Options: (No TOS-capability, DC, Upward) > LS Type: Summary Links(Network) > Link State ID: 33.33.33.0 (summary Network Number) > Advertising Router: 3.3.3.3 > LS Seq Number: 80000005 > Checksum: 0xD2A > Length: 28 > Network Mask: /24 > TOS: 0 Metric: 11111 > > TOS: 0 Metric: 11111 > > > if you do same command on R3 for network 22.22.22.0 then :- > > > R3#show ip ospf database sum 22.22.22.0 > > OSPF Router with ID (3.3.3.3) (Process ID 1) > > Summary Net Link States (Area 1) > > Routing Bit Set on this LSA <---- NOTE > LS age: 1471 > Options: (No TOS-capability, DC, Upward) > LS Type: Summary Links(Network) > Link State ID: 22.22.22.0 (summary Network Number) > Advertising Router: 2.2.2.2 > LS Seq Number: 80000007 > Checksum: 0xB4A5 > Length: 28 > Network Mask: /24 > TOS: 0 Metric: 11111 > > You can see that routing bit set for 22.22.22.0 on R3 and it is there in > routing table. I can ping this network > > Ping Test :- > > R2#ping 33.33.33.33 > > Type escape sequence to abort. > Sending 5, 100-byte ICMP Echos to 33.33.33.33, timeout is 2 seconds: > ..... > Success rate is 0 percent (0/5) > R2# > R2# > R2#show ip route 33.33.33.33 > % Network not in table > > R3#ping 22.22.22.22 > > Type escape sequence to abort. > Sending 5, 100-byte ICMP Echos to 22.22.22.22, timeout is 2 seconds: > !!!!! > Success rate is 100 percent (5/5), round-trip min/avg/max = 16/40/80 ms > R3# > R3#show ip route 22.22.22.22 > Routing entry for 22.22.22.0/24 > Known via "ospf 1", distance 110, metric 11112, type inter area > Last update from 192.168.23.2 on FastEthernet1/0, 00:17:55 ago > Routing Descriptor Blocks: > * 192.168.23.2, from 2.2.2.2, 00:17:55 ago, via FastEthernet1/0 > Route metric is 11112, traffic share count is 1 > > The another thing is that if I shutdown serial interface S0/0 of R2 then I > am able to ping 33.33.33.33 network , The S0/0 is touch to backbone area > (area 0) > > R2#config t > Enter configuration commands, one per line. End with CNTL/Z. > R2(config)#int s0/0 > R2(config-if)#shut > R2(config-if)# > *Mar 1 02:09:46.111: %OSPF-5-ADJCHG: Process 1, Nbr 1.1.1.1 on Serial0/0 > from F > ULL to DOWN, Neighbor Down: Interface down or detached > *Mar 1 02:09:48.095: %LINK-5-CHANGED: Interface Serial0/0, changed state > to adm > inistratively down > *Mar 1 02:09:49.095: %LINEPROTO-5-UPDOWN: Line protocol on Interface > Serial0/0, > changed state to down > R2(config-if)# > R2(config-if)# > R2(config-if)# > R2(config-if)#end > R2# > R2# > R2#ping 33.33.33.33 > > Type escape sequence to abort. > Sending 5, 100-byte ICMP Echos to 33.33.33.33, timeout is 2 seconds: > !!!!! > Success rate is 100 percent (5/5), round-trip min/avg/max = 8/36/116 ms > R2# > R2# > R2#show ip ospf database sum 33.33.33.0 > > OSPF Router with ID (2.2.2.2) (Process ID 1) > > Summary Net Link States (Area 1) > > Routing Bit Set on this LSA (<--- Now routing bit set) > LS age: 1980 > Options: (No TOS-capability, DC, Upward) > LS Type: Summary Links(Network) > Link State ID: 33.33.33.0 (summary Network Number) > Advertising Router: 3.3.3.3 > LS Seq Number: 80000004 > Checksum: 0xF29 > Length: 28 > Network Mask: /24 > TOS: 0 Metric: 11111 > > Regards > Amit Chopra > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > -- Bryan Bartik CCIE #23707 (R&S), CCNP Sr. Support Engineer - IPexpert, Inc. 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