I think you're mixing apples and oranges a bit.
Do you mean the BGP session would come up and not stay up?
If so you need to do a
show ip bgp neighbor a.b.c.d | inc data
and view the mss size, make sure that packets of that negotiated size can
pass over the link. What you'll see in this case many times is keep alive
packets not traversing so the link will come up and then drop when the keep
alive timer is exceeded.
If you mean that traffic would establish, routes would exchange, and then
the session would stay up but traffic couldn't traverse over 5M/S you've
probably got something else at work rather than BGP. If I'm understanding
what you're saying correctly which I might not be.
-----Original Message-----
From: Righa Shake
Sent: Thursday, September 22, 2011 2:24 PM
To: Keegan Holley
Cc: [email protected]
Subject: Re: [c-nsp] BGP Required MTU Size Between Cisco Devices
I had set my Interfaces on an MTU size of 1600 and BGP was unstable and
could not pass traffic over 5MB.
However when i tested an found that I could pass traffic without any issues
when I eliminate the router.
When I set the MTU to 1500 the BG was up and am now able to pass traffic
without any problem.
Regards,
Righa Shake
On Thu, Sep 22, 2011 at 9:03 PM, Keegan Holley
<[email protected]>wrote:
I think MTU discovery just has to work if you are going to use something
smaller than 1500 and fragmentation needs to work if you are going to set
it
to something small. There are other caveats for specific scenarios.
2011/9/22 Righa Shake <[email protected]>
Hi,
Is there any required MTU Size for Cisco BGP session to work
Regards,
Righa Shake
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