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BGP Summarize network

Posted on 2013-05-20
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Last Modified: 2013-05-22
Dear All,

We are using MPLS on our Router

now we need to add a summarized network on the existing BGP setup.....but unable to show the same under BGP table.

this is my BGP config.

router bgp 65300
no synchronization
bgp log-neighbor-changes
network 10.110.110.0 mask 255.255.255.0
network 172.29.200.48 mask 255.255.255.252
network 172.31.201.0 mask 255.255.255.0
redistribute ospf 10
neighbor 172.29.200.50 remote-as 65009
neighbor 172.29.200.50 default-originate
neighbor 172.29.200.50 weight 10
no auto-summary

All of the networks are redistributing though OSPF.
Now i need to advertise summarized networks like  10.0.0.0/8 & 172.16.0.0/12. We tried to advertise this with "network" comand  but i cant see these networks in BGP table.
How to advertise these summary networks through BGP.

I am a beginner with BGP......could you people help on the same ?
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Question by:senmohan
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Accepted Solution

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pergr earned 500 total points
ID: 39183453
Hi,

Use

aggregate-address 10.0.0.0 255.0.0.0 summary-only
aggregate-address 172.16.0.0 255.240.0.0 summary-only

The "summary-only" means on the the summary will be advertised..., and not the smaller routers.
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by:senmohan
ID: 39183521
Hi Pergr,

Thanks for your replay.

Do i need to remove these from config to do that?

"network 10.110.110.0 mask 255.255.255.0
network 172.29.200.48 mask 255.255.255.252
network 172.31.201.0 mask 255.255.255.0
redistribute ospf 10"

Did the aggregate command do any difference in existing sites?
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LVL 17

Expert Comment

by:pergr
ID: 39183538
You can remove the network statements if you want to, but it is not necessary.

Not sure what you mean with "existing sites", but other sites will now only receive the /8 and /12 routes.

If all of your sites are using smaller networks in these /8 and /12, then it is probably not suitable to advertise only those routes - but your question was how to do these summary routes.
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Author Comment

by:senmohan
ID: 39187397
Thanks Pergr. Its working fine. :)
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