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New Member

Need BGP help ASAP

I am having a problem advertising one route. I have a network statement,

network 206.129.13.0, and

aggregate-address 206.129.13.0 255.255.255.0 summary-only

But when I do a show ip bgp for the route on my router I get this output:

c7206# sh ip bgp 206.129.13.0

BGP routing table entry for 206.129.0.0/16, version 1340124

Paths: (2 available, best #1, table Default-IP-Routing-Table)

Not advertised to any peer

I have 206.129.12.0 configured the same way and sh ip bgp for this route gives this result:

c7206# sh ip bgp 207.149.12.0

BGP routing table entry for 207.149.12.0/24, version 5843366

Paths: (1 available, best #1, table Default-IP-Routing-Table)

Advertised to non peer-group peers:

63.251.175.177 206.129.33.53 206.165.194.217

Local

0.0.0.0 from 0.0.0.0 (64.240.108.1)

Origin IGP, metric 0, localpref 100, weight 32768, valid, sourced, local, best

6347

206.129.33.53 from 206.129.33.53 (209.83.159.21)

Origin IGP, localpref 200, valid, external, atomic-aggregate, best

Community: 6347:1021 6347:2000

14744 701 6347

63.251.175.177 from 63.251.175.177 (63.251.160.132)

Origin IGP, localpref 70, valid, external

I do not see anything in route maps, access lists etc. that would stop me from advertising this route.

Thanks.

  • Other Network Infrastructure Subjects
6 REPLIES
Silver

Re: Need BGP help ASAP

Is your aggregate statement above a typo. Shouldn't it be 206.129.12.0 255.255.254.0?

See what do you get with 'show ip bgp neighbor x.x.x.x adver'.

Do you have no sync on? Do you have correct local routes to these networks?

Thanks.

New Member

Re: Need BGP help ASAP

Here is my set up. Do I need to specify 255.255.255.0 in the network statement like I have for the 64.240.108.0 ?

router bgp 13853

no synchronization

bgp router-id 64.240.108.1

bgp cluster-id 3481985278

network 64.240.108.0 mask 255.255.255.0

network 64.240.109.0 mask 255.255.255.0

network 199.217.73.0

network 206.129.12.0

network 206.129.13.0

network 206.129.32.0

network 207.138.224.0

network 207.138.233.0

network 207.149.12.0

network 207.149.13.0

network 209.102.32.0

network 209.102.33.0

aggregate-address 64.240.108.0 255.255.255.0 summary-only

aggregate-address 64.240.109.0 255.255.255.0 summary-only

aggregate-address 199.217.73.0 255.255.255.0 summary-only

aggregate-address 206.129.12.0 255.255.255.0 summary-only

aggregate-address 206.129.13.0 255.255.255.0 summary-only

aggregate-address 206.129.32.0 255.255.255.0 summary-only

aggregate-address 207.138.224.0 255.255.255.0 summary-only

aggregate-address 207.138.233.0 255.255.255.0 summary-only

aggregate-address 207.149.12.0 255.255.255.0 summary-only

aggregate-address 207.149.13.0 255.255.255.0 summary-only

aggregate-address 209.102.32.0 255.255.255.0 summary-only

aggregate-address 209.102.33.0 255.255.255.0 summary-only

Silver

Re: Need BGP help ASAP

The lines:

aggregate-address 64.240.108.0 255.255.255.0 summary-only ----A

aggregate-address 64.240.109.0 255.255.255.0 summary-only -----B

Should be replaced with:

aggregate-address 64.240.108.0 255.255.254.0 summary-only ----C

because C includes networks of both A and B statments. Again, check if "show ip bgp neighbor x.x.x.x advertised" is showing you something different ( routes are being propagated). The same should be done wih the rest of summarizable networks.

You should use subnet masks for networks statements. In your case above you are using them where necessary. They should correspond to your IGP/Static routes.

Regards.

New Member

Re: Need BGP help ASAP

Here is show ip bgp neighbor x.x.x.x . I have no issue with the 64.240.108.0 or 109. The problem is with 206.129.13.0 / 24. 206.129.12.0/24 is fine and there is no difference in their config. Could this be an issue with my provider?

7206#sh ip bgp neighbor 206.129.33.53 advertise

BGP table version is 6298658, local router ID is 64.240.108.1

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal

Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path

*> 64.240.108.0/24 0.0.0.0 0 32768 i

*> 64.240.109.0/24 0.0.0.0 0 32768 i

*> 199.217.73.0 0.0.0.0 0 32768 i

*> 206.129.12.0 0.0.0.0 0 32768 i

*> 206.129.32.0 0.0.0.0 0 32768 i

*> 207.138.224.0 0.0.0.0 0 32768 i

*> 207.138.233.0 0.0.0.0 0 32768 i

*> 207.149.12.0 0.0.0.0 0 32768 i

*> 209.102.32.0 0.0.0.0 0 32768 i

*> 209.102.33.0 0.0.0.0 0 32768 i

Silver

Re: Need BGP help ASAP

Do you have 206.129.13.0 / 24 entry in your routing table?

If you really want to advertise, this 13.0, to your neighbor (no matter what) then add this line to your config:

aggregate-address 206.129.12.0 255.255.254.0 summary

Of course, the above wont work if filters dont allow it to.

If you are suppose to be receiving this route from your provider then yes it could be their problem. Check your prefix-lists or route-maps too.

Thanks.

New Member

Re: Need BGP help ASAP

I fixed it by entering ip route 206.129.13.0 255.255.255.0 null0 254

thanks for all the help.

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