OSPF route between Nexus7010 and ASR

[mohammedrafiq]

          Hi,

I cannot receive any OSPF route from Nexus to ASR1002 even they are both OSPF neighbour. I have attached the config for both, Please can you have a look and advise.Both Nexus and ASR part of Area0.

Config

ASR1002#sh ip ospf neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface
10.165.117.12     1   FULL/BDR        00:00:35    10.231.175.226  GigabitEthernet0/0/0

ASR1002#sh ip ro ospf
Codes: L - local, 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, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is not set

ASR1002#
----------------------------------------
ON NEXUS

N7K(config)# sh  ip ospf nei
OSPF Process ID 1 VRF default
Total number of neighbors: 1
Neighbor ID     Pri State            Up Time  Address         Interface

10.231.175.253    1 FULL/ -          00:08:17 10.231.175.225  Eth10/13

interface loopback10
  ip address 10.10.10.1/24
  ip ospf network point-to-point
  ip router ospf 1 area 0.0.0.0
!
router ospf 1
  router-id 10.165.117.12
  summary-address 10.10.10.0/24
redistribute direct route-map any

!

ip prefix-list any seq 5 permit 10.10.10.0/24

!

route-map any permit 10

  match ip address prefix-list any

Regards,

[Giuseppe Larosa · Accepted solution]

Hello Mohammed,

there is a mismatch in OSPF network type

we see the ASR considers the neighbor in FULL/BDR, but the Nexus configured for point to point considers the neighbor in FULL/-. This means that for the Nexus no DR/BDR has to be elected on the segment..

This mismatch can be detected in OSPF hellos in DR and BDR addresses fields.

As a result of  network type mismatch received LSAs are not used and no OSPF routes are installed.

Is the ASR 1002 configured for network point-to-point ?   My guess is still in OSPF default settings of broadcast network.

IF it is configured for point-to-point,you may be facing an incompatibility here.

Hope to help

Giuseppe

[mohammedrafiq]

Thanks Giuseppe,

I have changed ASR to p2p and working fine,

Regards,