RE: <Keepalives are temporarily in throttle due to closed TCP window>

["Michael Ruiz" <mruiz () telwestservices com>]

Oh you guys are going to love this...Before I could send out the maintenance notification for tonight to make changes,  
The session has been up for 21 hours.  This is before I could put a packet capture server on the segment.  <Sigh> 

<SNIP>
  BGP state = Established, up for 21:29:25
  Last read 00:00:24, last write 00:00:02, hold time is 180, keepalive interval is 60 seconds
  Neighbor capabilities:


-----Original Message-----
From: Michael Ruiz 
Sent: Thursday, September 17, 2009 7:47 AM
To: Richard A Steenbergen; Michael Ruiz
Cc: Brian Dickson; nanog () nanog org
Subject: RE: <Keepalives are temporarily in throttle due to closed TCP window>

And is that the one that traverses the 3550 with the 1500 byte MTU? 

Both connection traver through the 3550. I will disable the command on 7206 vxr. thanks

-----Original Message-----
From: "Richard A Steenbergen" <ras () e-gerbil net>
To: "Michael Ruiz" <mruiz () telwestservices com>
Cc: "Brian Dickson" <Brian.Dickson () concertia com>; "nanog () nanog org" <nanog () nanog org>
Sent: 9/16/09 8:58 PM
Subject: Re: <Keepalives are temporarily in throttle due to closed TCP window>

On Wed, Sep 16, 2009 at 06:47:10PM -0500, Michael Ruiz wrote:
> > Either a) you have the mtu misconfigured on that 7206vxr
>
> That part is where I am at a loss.  How is it the 6509 can establish a
> IBGP session with a 7606 when it has to go through the 7206 VXR?  The
> DS-3s are connected to the 7206 VXR. To add more depth to the story.  I
> have 8 IBGP sessions that are connected to the 7206 VXR that have been
> up and running for over a year.  Some of the sessions traverse the DS-3s
> and or a GigE long haul connections.  There are a total 10 Core routers
> that are mixture of Cisco 7606, 6509s, 7206 VXR w/ NPE400s or G1s.  Only
> this one IBGP session out of 9 routers is not being established.  Since
> I have a switch between the 7606 and 7206, I plan to put a packet
> capture server and see what I can see. 

And is that the one that traverses the 3550 with the 1500 byte MTU? 
Re-read what we said. You should be able to test the MTU theory by 
disabling path-mtu-discovery, which will cause MSS to fail back to the 
minimum 576.

-- 
Richard A Steenbergen <ras () e-gerbil net>       http://www.e-gerbil.net/ras
GPG Key ID: 0xF8B12CBC (7535 7F59 8204 ED1F CC1C 53AF 4C41 5ECA F8B1 2CBC)