RE: seeing prefixes learned via AS100-400 and also locally

Thanks Jochen. this route feedback is normal? is this what is
happening?....bb3 send rip routes to r4....r4 sends those routes back to bb3
via bgp....bb3 bgp table says rib failure since admin distance is worse than
what bb3 already has as distance 0 (connected) ?

Aaron

RS.1.1.BB3#sh ip prot | be outing for
  Routing for Networks:
    30.0.0.0
    31.0.0.0
    204.12.1.0

------------------------------------------

Rack1R4#sh run | section bgp
 mpls bgp forwarding
  redistribute bgp 400 metric transparent
router bgp 400
 no synchronization
 bgp log-neighbor-changes
 neighbor 2.2.2.2 remote-as 100
 neighbor 2.2.2.2 update-source Tunnel0
 neighbor 150.1.5.5 remote-as 300
 neighbor 150.1.5.5 ebgp-multihop 255
 neighbor 150.1.5.5 update-source Loopback0
 no auto-summary
 !
 address-family vpnv4
  neighbor 2.2.2.2 activate
  neighbor 2.2.2.2 send-community extended
 exit-address-family
 !
 address-family ipv4 vrf VPN_A
  redistribute rip
  neighbor 204.12.1.254 remote-as 54
  neighbor 204.12.1.254 local-as 100
  neighbor 204.12.1.254 activate
  no synchronization
 exit-address-family

Rack1R4#sh run | section rip
router rip
 version 2
 !
 address-family ipv4 vrf VPN_A
  redistribute bgp 400 metric transparent
  network 204.12.1.0
  no auto-summary
  version 2
 exit-address-family
  redistribute rip
Rack1R4#

Rack1R4#sh ip vrf
  Name Default RD Interfaces
  VPN_A 100:1 Gi0/1

Rack1R4#sh run in g0/1 | in ip addr
 ip address 204.12.1.4 255.255.255.0

-----Original Message-----
From: Jochen Bartl [mailto:jochen.bartl_at_gmail.com]
Sent: Friday, December 30, 2011 10:36 AM
To: Aaron
Cc: ccielab_at_groupstudy.com
Subject: Re: seeing prefixes learned via AS100-400 and also locally
connected

The reason is that BB3 is originating those prefixes via an IGP to its
neighbors (show ip proto). But he also learns his own prefixes via BGP
from 204.12.1.4.

Since the (E)BGP routes have a higher AD (20) than the directly
connected routes (0), they are marked with "r" to indicate a RIB failure.

I guess you are advertising those IGP learned routes via redistribution
or the network command on one of your BGP routers (R1 - R6, SW1 - SW4)
in the topology.

Best regards,

Jochen

Blogs and organic groups at http://www.ccie.net
Received on Fri Dec 30 2011 - 11:09:49 ART