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Community Member

Ospf unable to form neighborship between router and Nexus 5.1

guys,

i have one router, 2 cat 6509 and 2 nexus 7010 running on multiaccess network. The router or cat 6509 unable to form neighbotship with nexus. it just stucked at exchange process. I have tried without authentication, ospf priority, int wont help. I also tried putting the ospf mtu-ginore at all devices. this command also did not help.

However if i shut down the vlan/interface on both nexus, the router can establish neighborship with cat6509. below is the debug on the router.

anyone come across this problem?

eb  8 08:14:10.693: OSPF-64653 PAK  : rcv. v:2 t:1 l:60 rid:136.186.255.253 aid:0.0.12.50 chk:23D9 aut:0 auk: from Port-channel2.1

Feb  8 08:14:10.693: OSPF-64653 ADJ   Po2.1: Neighbor change event

Feb  8 08:14:10.693: OSPF-64653 ADJ   Po2.1: DR/BDR election

Feb  8 08:14:10.693: OSPF-64653 ADJ   Po2.1: Elect BDR 136.186.255.253

Feb  8 08:14:10.693: OSPF-64653 ADJ   Po2.1: Elect DR 136.186.255.254

Feb  8 08:14:10.693: OSPF-64653 ADJ   Po2.1: DR: 136.186.255.254 (Id)   BDR: 136.186.255.253 (Id)

Feb  8 08:14:12.449: OSPF-64653 PAK  : rcv. v:2 t:1 l:60 rid:136.186.2.201 aid:0.0.12.50 chk:13E2 aut:0 auk: from Port-channel2.1

Feb  8 08:14:12.637: OSPF-64653 PAK  : rcv. v:2 t:2 l:32 rid:136.186.255.254 aid:0.0.12.50 chk:3CD aut:0 auk: from Port-channel2.1

Feb  8 08:14:12.637: OSPF-64653 PAK  : rcv. v:2 t:4 l:56 rid:136.186.255.254 aid:0.0.12.50 chk:AB93 aut:0 auk: from Port-channel2.1

Feb  8 08:14:12.637: OSPF-64653 ADJ   Po2.1: Rcv DBD from 136.186.255.254 seq 0x27A2F59F opt 0x42 flag 0x7 len 32  mtu 1500 state EXCHANGE

Feb  8 08:14:12.637: OSPF-64653 ADJ   Po2.1: Send DBD to 136.186.255.254 seq 0x27A2F59F opt 0x52 flag 0x2 len 1252

eb  8 08:14:10.693: OSPF-64653 PAK  : rcv. v:2 t:1 l:60 rid:136.186.255.253 aid:0.0.12.50 chk:23D9 aut:0 auk: from Port-channel2.1

Feb  8 08:14:10.693: OSPF-64653 ADJ   Po2.1: Neighbor change event

Feb  8 08:14:10.693: OSPF-64653 ADJ   Po2.1: DR/BDR election

Feb  8 08:14:10.693: OSPF-64653 ADJ   Po2.1: Elect BDR 136.186.255.253

Feb  8 08:14:10.693: OSPF-64653 ADJ   Po2.1: Elect DR 136.186.255.254

Feb  8 08:14:10.693: OSPF-64653 ADJ   Po2.1: DR: 136.186.255.254 (Id)   BDR: 136.186.255.253 (Id)

Feb  8 08:14:12.449: OSPF-64653 PAK  : rcv. v:2 t:1 l:60 rid:136.186.2.201 aid:0.0.12.50 chk:13E2 aut:0 auk: from Port-channel2.1

Feb  8 08:14:12.637: OSPF-64653 PAK  : rcv. v:2 t:2 l:32 rid:136.186.255.254 aid:0.0.12.50 chk:3CD aut:0 auk: from Port-channel2.1

Feb  8 08:14:12.637: OSPF-64653 PAK  : rcv. v:2 t:4 l:56 rid:136.186.255.254 aid:0.0.12.50 chk:AB93 aut:0 auk: from Port-channel2.1

Feb  8 08:14:12.637: OSPF-64653 ADJ   Po2.1: Rcv DBD from 136.186.255.254 seq 0x27A2F59F opt 0x42 flag 0x7 len 32  mtu 1500 state EXCHANGE

Feb  8 08:14:12.637: OSPF-64653 ADJ   Po2.1: Send DBD to 136.186.255.254 seq 0x27A2F59F opt 0x52 flag 0x2 len 1252

6 REPLIES
Community Member

Ospf unable to form neighborship between router and Nexus 5.1

another debug

eb  8 08:10:45.558: OSPF-64653 ADJ   Po2.1: Rcv DBD from 136.186.255.253 seq 0x5006AF23 opt 0x42 flag 0x7 len 32  mtu 1500 state EXCHANGE

Feb  8 08:10:45.558: OSPF-64653 ADJ   Po2.1: Send DBD to 136.186.255.253 seq 0x5006AF23 opt 0x52 flag 0x2 len 1252

Feb  8 08:10:46.070: OSPF-64653 PAK  : rcv. v:2 t:2 l:32 rid:136.186.255.254 aid:0.0.12.50 chk:3CD aut:0 auk: from Port-channel2.1

Feb  8 08:10:46.070: OSPF-64653 ADJ   Po2.1: Rcv DBD from 136.186.255.254 seq 0x27A2F59F opt 0x42 flag 0x7 len 32  mtu 1500 state EXCHANGE

Feb  8 08:10:46.070: OSPF-64653 ADJ   Po2.1: Send DBD to 136.186.255.254 seq 0x27A2F59F opt 0x52 flag 0x2 len 1252

Feb  8 08:10:47.534: OSPF-64653 PAK  : rcv. v:2 t:1 l:60 rid:136.186.2.200 aid:0.0.12.50 chk:13E2 aut:0 auk: from Port-channel2.1

Feb  8 08:10:50.694: OSPF-64653 PAK  : rcv. v:2 t:2 l:32 rid:136.186.255.253 aid:0.0.12.50 chk:21E6 aut:0 auk: from Port-channel2.1

Feb  8 08:10:50.694: OSPF-64653 ADJ   Po2.1: Rcv DBD from 136.186.255.253 seq 0x5006AF23 opt 0x42 flag 0x7 len 32  mtu 1500 state EXCHANGE

Feb  8 08:10:50.694: OSPF-64653 ADJ   Po2.1: Send DBD to 136.186.255.253 seq 0x5006AF23 opt 0x52 flag 0x2 len 1252

Feb  8 08:10:51.174: OSPF-64653 PAK  : rcv. v:2 t:1 l:60 rid:136.186.255.253 aid:0.0.12.50 chk:23E2 aut:0 auk: from Port-channel2.1

Feb  8 08:10:51.822: OSPF-64653 PAK  : rcv. v:2 t:2 l:32 rid:136.186.255.254 aid:0.0.12.50 chk:3CD aut:0 auk: from Port-channel2.1

Feb  8 08:10:51.822: OSPF-64653 ADJ   Po2.1: Rcv DBD from 136.186.255.254 seq 0x27A2F59F opt 0x42 flag 0x7 len 32  mtu 1500 state EXCHANGE

eb  8 08:10:45.558: OSPF-64653 ADJ   Po2.1: Rcv DBD from 136.186.255.253 seq 0x5006AF23 opt 0x42 flag 0x7 len 32  mtu 1500 state EXCHANGE

Feb  8 08:10:45.558: OSPF-64653 ADJ   Po2.1: Send DBD to 136.186.255.253 seq 0x5006AF23 opt 0x52 flag 0x2 len 1252

Feb  8 08:10:46.070: OSPF-64653 PAK  : rcv. v:2 t:2 l:32 rid:136.186.255.254 aid:0.0.12.50 chk:3CD aut:0 auk: from Port-channel2.1

Feb  8 08:10:46.070: OSPF-64653 ADJ   Po2.1: Rcv DBD from 136.186.255.254 seq 0x27A2F59F opt 0x42 flag 0x7 len 32  mtu 1500 state EXCHANGE

Feb  8 08:10:46.070: OSPF-64653 ADJ   Po2.1: Send DBD to 136.186.255.254 seq 0x27A2F59F opt 0x52 flag 0x2 len 1252

Feb  8 08:10:47.534: OSPF-64653 PAK  : rcv. v:2 t:1 l:60 rid:136.186.2.200 aid:0.0.12.50 chk:13E2 aut:0 auk: from Port-channel2.1

Feb  8 08:10:50.694: OSPF-64653 PAK  : rcv. v:2 t:2 l:32 rid:136.186.255.253 aid:0.0.12.50 chk:21E6 aut:0 auk: from Port-channel2.1

Feb  8 08:10:50.694: OSPF-64653 ADJ   Po2.1: Rcv DBD from 136.186.255.253 seq 0x5006AF23 opt 0x42 flag 0x7 len 32  mtu 1500 state EXCHANGE

Feb  8 08:10:50.694: OSPF-64653 ADJ   Po2.1: Send DBD to 136.186.255.253 seq 0x5006AF23 opt 0x52 flag 0x2 len 1252

Feb  8 08:10:51.174: OSPF-64653 PAK  : rcv. v:2 t:1 l:60 rid:136.186.255.253 aid:0.0.12.50 chk:23E2 aut:0 auk: from Port-channel2.1

Feb  8 08:10:51.822: OSPF-64653 PAK  : rcv. v:2 t:2 l:32 rid:136.186.255.254 aid:0.0.12.50 chk:3CD aut:0 auk: from Port-channel2.1

Feb  8 08:10:51.822: OSPF-64653 ADJ   Po2.1: Rcv DBD from 136.186.255.254 seq 0x27A2F59F opt 0x42 flag 0x7 len 32  mtu 1500 state EXCHANGE

Bronze

Ospf unable to form neighborship between router and Nexus 5.1

I don't know what subnetting are you using, but you have an ip addressing problem from what I see.

Feb  8 08:10:47.534: OSPF-64653 PAK  : rcv. v:2 t:1 l:60  rid:136.186.2.200 aid:0.0.12.50 chk:13E2 aut:0 auk: from Port-channel2.1

Feb   8 08:10:50.694: OSPF-64653 PAK  : rcv. v:2 t:2 l:32 rid:136.186.255.253  aid:0.0.12.50 chk:21E6 aut:0 auk: from Port-channel2.1

Eugen

Community Member

Ospf unable to form neighborship between router and Nexus 5.1

Sorry , all the devices are in same subnet having diferent router -id.

Bronze

Ospf unable to form neighborship between router and Nexus 5.1

I see, you must have configured router-id yourself.

Sorry I can't see nothing else on this output.

Eugen

Cisco Employee

Ospf unable to form neighborship between router and Nexus 5.1

Please could you paste the topology digram and also the relevant configuration from the boxes.

Cheers,

-amit singh

Community Member

Ospf unable to form neighborship between router and Nexus 5.1

foudn the problem. the nexus has the loop prevention logic which does not allow traffic to traverse destine to a vPC member port.

" when external devices attempt to form a routing adjacency with the Nexus 7000′s over the vPC peer-link, some traffic destined for a vPC member port can be forced over the peer-link even when the network is healthy, causing traffic to be dropped by the loop prevention logic"

need to exclude the vlan from propagting via vpn domain.

command peer-gateway exclude vlann x.x.x.

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