nanog mailing list archives

Re: Getting pretty close to default IPv4 route maximum for 6500/7600 routers.


From: Jon Lewis <jlewis () lewis org>
Date: Tue, 6 May 2014 12:14:40 -0400 (EDT)

On Tue, 6 May 2014, Drew Weaver wrote:

Hi all,

I am wondering if maybe we should make some kind of concerted effort to remind folks about the IPv4 routing table 
inching closer and closer to the 512K route mark.

We are at about 94/95% right now of 512K.

For most of us, the 512K route mark is arbitrary but for a lot of folks who may still be running 6500/7600 or other 
routers which are by default configured to crash and burn after 512K routes; it may be a valuable public service.

Even if you don't have this scenario in your network today; chances are you connect to someone who connects to someone 
who connects to someone (etc...) that does.

In case anyone wants to check on a 6500, you can run:  show platform hardware capacity pfc and then look under L3 
Forwarding Resources.

Just something to think about before it becomes a story the community talks about for the next decade.

I've been configuring 6500/Sup7203bxl's with
mls cef maximum-routes ip 768

The only gotcha is, you have to reload for that to be effective.

Speaking of which, I've had WS-X6708-10GE cards "go bad on reload" in a couple of 6500s.

I see cisco finally released some more info on their "bad memory" announcement from several months back:

http://www.cisco.com/c/en/us/support/docs/field-notices/637/fn63743.html

It seems our "gone bad" 6708s may be included in this issue. If you don't have enough spare ports or spare cards, this puts you in a somewhat precarious situation. You need to reload to affect the v4/v6 route storage change, but you might lose some blades in the process.

----------------------------------------------------------------------
 Jon Lewis, MCP :)           |  I route
                             |  therefore you are
_________ http://www.lewis.org/~jlewis/pgp for PGP public key_________


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