Can someone please help and explain why this configuration is not working correctly. I am trying to get my 3 iBGP subnets redistributed into RIP in order to send them via RIP to the PIX connected via eth0. iBGP works fine and does what it needs to do. However, I cannot see the iBGP routes being redist when I sho the RIP database. thanks !
Re: Why are iBGP routes not being redist into RIP ?
I tested this on lab, and was perplexed to find the same results. The ibgp routes were not being redistributed into rip. Not just RIP, it didnt get redistributed via EIGRP, OSPF...Spent almost an hour behind this, thinking why its happening. Finally came to conclustion that, the reason has to be the design of BGP. IBGP routes shouldnt really be redistributed to IGP, because it can cause routing loops.
While browsing through the cisco website, i came across a command, called "bgp redistribute-internal". This command can be used to enable redistribution between iBGP routes and IGPs. By default a cisco router doesnt redistribute between iBGP and any IGP, to prevent possible routing loops.
The cisco document says that this is used to redistributes routes into IGPs such as OSPF and IS-IS. But I have tested this with RIP and it works with RIP too.
Use this command with extreme care, because this can be a potential source of routing loops in your network. The CLI command description itself describes it as "dangerous".
always-compare-med Allow comparing MED from different neighbors
bestpath Change the default bestpath selection
client-to-client Configure client to client route reflection
cluster-id Configure Route-Reflector Cluster-id
confederation AS confederation parameters
dampening Enable route-flap dampening
default Configure BGP defaults
deterministic-med Pick the best-MED path among paths advertised from
the neighboring AS
fast-external-fallover Immediately reset session if a link to a directly
connected external peer goes down
log-neighbor-changes Log neighbor up/down and reset reason
redistribute-internal Allow redistribution of iBGP into IGPs (dangerous)
router-id Override configured router identifier
scan-time Configure background scanner interval
Also a min of 12.1 IOS is required to use this command.
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