BGP Routing Question

[d-duddell]

Hi Guys I hope someone might have some advice to point me in the right direction. I have a router where if I do a "sh ip bgp 125.112.27.123" displays the following:

BGP routing table entry for 125.112.0.0/12, version 0

Paths: (1 available, no best path)

Not advertised to any peer

9837 7474 2914 4134, (aggregated by 4134 202.97.32.133), (received-only)

203.185.246.117 from 203.185.246.117 (202.92.64.225)

Origin incomplete, localpref 100, valid, external, atomic-aggregate

DMZ-Link Bw 1536 kbytes

However when I type the "sh ip route 125.112.27.123" command I get "% Subnet not in table"

Why is the BGP route not being inserted into the routing table?

[mark.edwards]

Hi, as you can see there is "no best path". Only best path routes are added to the routing table. Quite often the next hop is not available. Can you see 203.185.246.117 in your routing table?

[d-duddell]

I though so as well but 203.185.246.117 is directly connected.

[Edison Ortiz]

David,

Router with IP address (202.97.32.133) is using the community 'no-export' attribute for this route.

For more information, please read:

http://www.cisco.com/warp/public/459/aggregation.html

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Thanks

[d-duddell]

Thanks but how can you tell it is using the 'no-export' attribute?

[Edison Ortiz]

If you read the link that I posted, it describes route aggregation in BGP.

From the output you posted, this section describes why the route is not being forwarded to you.

"(aggregated by 4134 202.97.32.133), (received-only)"

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Thanks

[sundar.palaniappan]

David,

Can you post the output of 'show ip bgp sum'. It would be even better if you can post the config under the 'router bgp' process.

Sundar

[m-haddad]

Try to issue the command show ip bgp

It will show you the route and the associated next hop address.

Try to see if you have route recursion for the next hop otherwise the router won't install the BGP route in ther routing table.

Regards,