[c-nsp] 2851 and full BGP

[Paul Cosgrove]

Hi Chuck,

Jay will be able to clarify, but I took the following to mean that the 
two are separated via third party infrastructure: "two 2851s connected 
to each other over gigabit Ethernet WAN".

May well be a bug though.

Paul.

Church, Charles wrote:
> Wasn't the original problem the iBGP connection over his own network?  Sounds like a bug more than anything else.
> 
> Chuck
> 
> ----- Original Message -----
> From: cisco-nsp-bounces at puck.nether.net <cisco-nsp-bounces at puck.nether.net>
> To: mtinka at globaltransit.net <mtinka at globaltransit.net>
> Cc: cisco-nsp at puck.nether.net <cisco-nsp at puck.nether.net>
> Sent: Sun Aug 10 15:52:03 2008
> Subject: Re: [c-nsp] 2851 and full BGP
> 
> 
> 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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