Jo Rhett wrote:
That's the surprising thing -- no scenario. Very basic
configuration. Enabling uRPF and then hitting it with a few gig of
non-routable packets consistently caused the sup module to stop
talking on the console, and various other problems to persist
throughout the unit, ie no arp response. We were able to simulate
this with two 2 pc's direction connected to a 6500 in a lab. If I
remember right, we had to enable CEF to see the problem, but since CEF
is a kitchen sink that dozens of other features require you simply
couldn't disable it.
Definately sounds like it could be a problem - I'd like to try and
replicate this. What do you mean by non-routable traffic - traffic whose
destination has no route (I assume you are running defaultless), or
traffic that fails the uRPF check?
And correct me if I'm wrong but I thought you can't disable CEF on the
6500 platform?
hs-6513-1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
hs-6513-1(config)#no ip cef
% Incomplete command.
hs-6513-1(config)#no ip cef ?
accounting Enable CEF accounting
distributed Distributed Cisco Express Forwarding
event-log CEF event log commands
interface CEF linecard commands
linecard CEF linecard commands
load-sharing Load sharing
nsf Set CEF non-stop forwarding (NSF) characteristics
table Set CEF forwarding table characteristics
traffic-statistics Enable collection of traffic statistics
hs-6513-1(config)#no ip cef distributed
%Cannot disable CEF on this platform
hs-6513-1(config)#exit
hs-6513-1#sh version | inc IOS
IOS (tm) s72033_rp Software (s72033_rp-ADVENTERPRISEK9_WAN-M), Version
12.2(18)SXF11, RELEASE SOFTWARE (fc1)
Sam
