[c-nsp] Cisco 7301 running at 99% CPU doing iBGP update

Tue Jun 27 22:44:34 EDT 2006

Just currious,
Is there any research had (being) held in cisco for this let say 7206 VXR 
NPE-G1 (700 MHz)
for how many (maximum/recommended) number of BGP with full routing table 
peers or IBGP with restricted prefix peers ?

-- a.RI.r.sutan

----- Original Message ----- 
From: "Bruce Pinsky" <bep at whack.org>
To: "jamie baddeley" <jamie.baddeley at fx.net.nz>
Cc: <cisco-nsp at puck.nether.net>
Sent: Wednesday, June 28, 2006 3:11 AM
Subject: Re: [c-nsp] Cisco 7301 running at 99% CPU doing iBGP update

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: jamie baddeley wrote:
: > On Tue, 2006-06-27 at 11:51 -0700, Bruce Pinsky wrote:
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: >> Rodney Dunn wrote:
: >>> Wonder if he's getting recursive next hops.
: >>>
: >>> Make sure all your iBGP peers are next hop self.
: >
: > Thanks for the thoughts guys.
: >
: > Yep, got that as standard in IBGP peer group. And the iBGP peer is
: > learning things appropriately (if not somewhat slowly (the update ended
: > up taking an hour)) - Next hop is set to the iBGP peer you learn it from
: > etc.
: >
: > I already had MTU hardset to 9000 on both interfaces. Right now the link
: > between the two routers is a 2 metre piece of ethernet cable running at
: > 1 gig. No errors being reported. I'll change down to something like 1500
: > MTU to see if that makes a difference and turn damned autoneg off (even
: > if we do have no errors)
: >
: > About the only other thing I should point out is that the International
: > Feed is coming via EBGP multihop, and I'm using OSPF to stand up the
: > loopbacks in the IGP. But I'd be amazed if they had anything to do with
: > it.
: >
:
: You have the MTU set to 9K, but if you don't configure path MTU discovery,
: it's still a 576 MSS in TCP.  Check out the MSS in your TCP sessions via a
: show command to be sure.  With that small an MSS, it would be easy for the
: transmitting interface to overrun the receiver on the other end.  Are sure
: that you aren't getting drops on the receiving side?
:
: - --
: =========
: bep
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