[nsp] Path MTU discovery

[Jared Mauch]

On Sun, Apr 18, 2004 at 02:55:23PM -0400, Robert Boyle wrote:
> At 02:41 PM 4/18/2004, Jared Mauch <jared at puck.nether.net> wrote:
> >On Sun, Apr 18, 2004 at 11:37:53AM -0700, Christopher J. Wolff wrote:
> >> Hello,
> >>
> >> Just curious to see if anyone here has seen a real benefit to enabling 
> >TCP
> >> path mtu discovery on their routers and servers.  Thank you.
> >
> >        Yes, you can see significant bgp convergence improvements
> >by enabling it on a Cisco router.
> >
> >        by default it uses a 536 byte mss, by increasing it, you can
> >see much fewer packets to transmit bgp updates.  (ie: 1480 on ethernet,
> >or even larger if you have a all sonet core network).
> 
> Jared,
> 
> Both of you are mentioning this in a general sense. I have use mtu path 
> discovery for years with tunnel interfaces. Is there a global config 
> command or is this simply a BGP specific per peer config option?

	I'm speaking of the router (doing the p-mtu itself) for tcp
sessions to/from it.

	Now, hosts doing p-mtu through the router is a different issue..

	I know that some hosts don't do  p-mtu as well as they should..

	- jared



-- 
Jared Mauch  | pgp key available via finger from jared at puck.nether.net
clue++;      | http://puck.nether.net/~jared/  My statements are only mine.