From: paul cosgrove (paul.cosgrove@heanet.ie)
Date: Fri Aug 22 2008 - 16:44:32 ART
Hu Hyun,
Do you want to avoid globally enabling pmtud? According to the docs, ip
tcp path-mtu-discovery has been available since 10.3 so it should be an
option.
Paul.
Hyunseog Ryu wrote:
> That's what I wa afraid of.
> I checked our RTR A and RTR D, but RTR D doesn't have IOS to support
> that feature, yet.
> I will check the IOS upgrade, but I'm wondering whether somebody has any
> workaround or not.
>
> Hyun
>
>
> David Prall wrote:
>
>> You need to enable PMTUD within BGP. In 12.2SB code this can be configured
>> on a per neighbor basis. In other code it is within the bgp process for all
>> neighbors.
>>
>> David
>> --
>> http://dcp.dcptech.com
>>
>>
>>
>>
>>> -----Original Message-----
>>> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
>>> Behalf Of Hyunseog Ryu
>>> Sent: Friday, August 22, 2008 1:10 PM
>>> To: Cisco certification
>>> Subject: BGP MTU issue ?
>>>
>>> Hi Guys,
>>>
>>> I would like to form BGP session between remote locations.
>>>
>>> RTR A (GigE MTU 9000 bytes) ---- (GigE MTU 9000 bytes) RTR B (GigE MTU
>>> 1500 )--- (GigE MTU 1500 ) RTR C (GigE MTU 9000) --- (GigE
>>> MTU 9000) RTR D
>>>
>>>
>>> With this connection, I would like to form EBGP multihop
>>> session between
>>> RTR A and RTR D.
>>> But when I setup, it would not come up because it uses MTU 9000 bytes
>>> for BGP update packet, but the circuit between RTR B and RTR
>>> C has 1500
>>> MTU limitation.
>>> I don't have control over those two routers.
>>> Is there any way for BGP to use lower MTU for specific session only ?
>>> I appreciate your help.
>>> Thanks.
>>>
>>> Hyun
>>>
>>>
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>
>
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