[c-nsp] 2851 and full BGP

[Paul Cosgrove]

Keep in mind that if the peerings are not between directly connected IP, 
disabling PMTUd for BGP will cause it to use an MSS of 536 bytes.

You could check the achievable MTU using extended pings with the DF bit 
set, and compare it with the segment size listed by BGP before you 
decide whether to make that change.

Paul.

Mark Tinka wrote:
> On Saturday 09 August 2008 10:28:40 Jay Nakamura wrote:
>
>   
>> Any ideas on what could be causing this issue?  Is there
>> a better IOS version to use?
>>     
>
> Sounds like an MTU issue.
>
> Try disabling TCP PMTUd for BGP and see if that helps:
>
> router bgp 1234
>  no bgp transport path-mtu-discovery
>
> If that works, consider checking with your provider on the 
> supported MTU, end-to-end, and adjust your interface MTU if 
> it helps.
>
> Cheers,
>
> Mark.
>   
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>
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