[c-nsp] bgp slow prefix learning

[Jared Mauch]

On Tue, Aug 21, 2007 at 12:42:14PM -0400, Jason LeBlanc wrote:
> I'm wondering if I have something that is by design or if something else 
> is slowing my routers down.  I have two 2811s with 768 megs running 
> 12.4(4)T3, each connected to different upstreams via fast ethernet.  I'm 
> using prefix lists to limit them to /22, but I should have enough ram 
> for a full /24 view.  My problem is that anytime I clear a neighbor it 
> takes them hours to learn all the prefixes again, which has forced me to 
> add static defaults to compensate.  My cpu is 2-4% during this, so I 
> can't see how its cpu bound.  Anyone have any ideas?

	Enable "ip tcp path-mtu-discovery" globally.

	that should help.  If they're also using a Juniper,
some much older code had some odd propogation properties.  They
may need to upgrade code.  I think this was back in 4.x or 5.x.

	- Jared

-- 
Jared Mauch  | pgp key available via finger from jared at puck.nether.net
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