BGP Redistribute-Internal

By default, iBGP routes do not get redistributed into OSPF or ISIS. We need to add 'bgp redistribute-internal' under BGP router configuration to enable the BGP internal routes get redistributed in OSPF or ISIS.


Scenario 1:  If we do not configure 'bgp redistribute-internal' command  under BGP, we will not see the route for 10.10.0.1/32 on R3.

R3#show ip route 10.10.0.1
% Subnet not in table


Scenario 2:  After adding the 'bgp redistribute-internal' command under BGP, we will see the route for 10.10.0.1/32 on R3.

R2(config-if)#router bgp 100
R2(config-router)#bgp redistribute-internal


R3#show ip route 10.10.0.1
Routing entry for 10.10.0.1/32
  Known via "ospf 1", distance 110, metric 1, type extern 2, forward metric 1
  Last update from 10.10.23.2 on FastEthernet1/0, 00:00:03 ago
  Routing Descriptor Blocks:
  * 10.10.23.2, from 10.10.0.2, 00:00:03 ago, via FastEthernet1/0
      Route metric is 1, traffic share count is 1


Or if we were running ISIS between R2-R3

R3#show ip route 10.10.0.1
Routing entry for 10.10.0.1/32
  Known via "isis", distance 115, metric 10, type level-2
  Redistributing via isis
  Last update from 10.10.23.2 on FastEthernet1/0, 00:00:03 ago
  Routing Descriptor Blocks:
  * 10.10.23.2, from 10.10.23.2, 00:00:03 ago, via FastEthernet1/0
      Route metric is 10, traffic share count is 1


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