BGP redistribute-internal

[sebastian.lemke]

Hi,

I am using iBGP as a routing protocol in a Hub-and-Spoke topology.

I configured "bgp redistribute-internal" on the hub router so that all routes learned by SpokeA are forwarded to SpokeB. However, it simply doesn't work. No routes are advertised.

I see the route learned from SpokeA on the Hubg router:

Hub#sh ip bgp

BGP table version is 5, local router ID is 1.1.1.1

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

              r RIB-failure, S Stale

Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf Weight Path

*>i3.3.3.3/32       10.10.10.3               0    100      0 i

But this route is not distributed to SpokeB.

Am I using the correct feature for this approach, or should I only use route reflectors?

Thanks

Here's the Hub BGP config (Lab environment):

router bgp 65002

no synchronization

bgp router-id 1.1.1.1

bgp log-neighbor-changes

bgp redistribute-internal

bgp scan-time 10

timers bgp 7 21

neighbor MPLS peer-group

neighbor MPLS remote-as 65002

neighbor MPLS update-source FastEthernet0/0

neighbor MPLS next-hop-self

neighbor MPLS soft-reconfiguration inbound

neighbor MPLS2 peer-group

neighbor MPLS2 remote-as 65002

neighbor MPLS2 update-source FastEthernet0/1

neighbor MPLS2 next-hop-self

neighbor MPLS2 soft-reconfiguration inbound

neighbor 10.10.10.3 peer-group MPLS

neighbor 20.20.20.2 peer-group MPLS2

distance bgp 20 90 90

no auto-summary

[antonio.guirado · Accepted solution]

Hello,

I think you are mistaken. The command "bgp redistribute-internal" allow sthe redistribution of iBGP routes into an interior gateway protocol such as IS-IS or OSPF non in to other iBGP peer. By default, iBGP does not propagate to other

internal peers prefixes learned from other iBGP peers.

You need a BGP router reflector. Configure the HUB router:

router bgp 65002

neighbor 10.10.10.3 route-reflector-client

neighbor 20.20.20.2 route-reflector-client

Regards.

[sebastian.lemke]

Thanks, I was already assuming that.

To avoid many config lines I will configure the following:

router bgp 65002

no synchronization

bgp router-id 1.1.1.1

bgp log-neighbor-changes

bgp scan-time 10

timers bgp 7 21

bgp listen range 10.10.10.0/24 peer-group MPLS

bgp listen range 20.20.20.0/24 peer-group MPLS2

bgp listen limit 100

neighbor MPLS peer-group

neighbor MPLS remote-as 65002

neighbor MPLS update-source FastEthernet0/0

neighbor MPLS next-hop-self

neighbor MPLS soft-reconfiguration inbound

neighbor MPLS route-reflector-client

neighbor MPLS2 peer-group

neighbor MPLS2 remote-as 65002

neighbor MPLS2 update-source FastEthernet0/1

neighbor MPLS2 next-hop-self

neighbor MPLS2 soft-reconfiguration inbound

neighbor MPLS2 route-reflector-client

distance bgp 20 90 90

no auto-summary