From: Hobbs (deadheadblues@gmail.com)
Date: Fri Aug 22 2008 - 14:18:47 ART
Never had that particular issue with BGP but here's a thought:
BGP uses TCP which uses a maximum segment size that is negotiated during the
3 way handshake. You should be able to adjust the TCP maximum segment size,
this may do the trick.
int whatever0/0
ip tcp adjust-mss 1400
something like that should prevent the routers from sending tcp segments
over 1400 (use whatever value works for you)....I used to see this problem
with IPSec VPNs because the tunnel/encryption headers made the packet to
big. Rather than adjusting MTU on every device which I think was impossible
usually, we just adjusted the tcp mss on one or both edges.
hope that helps
*
*
On Fri, Aug 22, 2008 at 11:09 AM, Hyunseog Ryu <r.hyunseog@ieee.org> wrote:
> 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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