Routing Updates Issue when Link Restored

keven.jones · ‎12-12-2010

Hi

LocA---------------------{ MPLS_Cloud }---------------------------LocB

|

Loc_C

LocA---------------------P-2-P----------------------------LocB

* All locations have MPLS link to provider

* LocA & LocB locations are connected by p2p link in addition to MPLS link

* On LocA & LocB MPLS link is terminated on MPLs_site_RTR and P-2-P link is terminated on Core

* MPLS link running bgp with provider

* p2p link is having ospf as protocol

When Loc A loses connection to MPLS cloud Loc_C is reachable via P-2-P

when the link is restored back still the traffic for Loc_C passes accross P-2-P link.

Any Help Why routing table is not updated.

R1 configuration

router ospf 9

log-adjacency-changes

redistribute bgp 5310 subnets

passive-interface default

no passive-interface FastEthernet0/1

network 10.20.10.1 0.0.0.0 area 0

!

router bgp 5310

no synchronization

bgp log-neighbor-changes

redistribute ospf 9 match internal external 1 external 2

neighbor 100.20.20.2 remote-as 5300

no auto-summary

cheers

Keven

Reza Sharifi · ‎12-12-2010

Hi,

Have a look at this discussion. One way to resolve this is to set the EBGP peer higher then 32768. In this example it is set to 32769

router bgp 65001
 bgp log-neighbor-changes
 neighbor 172.16.56.6 remote-as 65000
 !
 address-family ipv4
 no synchronization
 redistribute ospf 1 match internal external 1 external 2
 neighbor 172.16.56.6 activate
 neighbor 172.16.56.6 weight 32769
 no auto-summary
 exit-address-family

here is the link to the discussion

https://supportforums.cisco.com/docs/DOC-5748

HTH

Reza

Pravesh Painuly · ‎12-13-2010

To understand OSPF and/or to prepare for Networking Interview:
http://4networkprofessionals.com

is the best place to visit. Enjoy