From: Mike Schlenger (mschlenger@xxxxxxxxxxxxxxxxxxxxxxx)
Date: Tue Aug 06 2002 - 16:41:40 GMT-3
Sorry for the OT but I'm enlisting the advice of any ip cef experts out
there.
Problem:
A couple times per week, a "clear arp cache" needs to be issued on our main
6509 MSFC in order to reestablish desktop/IP phone connectivity. It seems as
though devices cannot communicate off of their vlan when this problem
arises. It is strange because sometimes it affects only certain
workstations/IP phones, and other times (like this weekend) I lost
connectivity to an entire vlan.
I'm going to use ping ( using the record route) next time this occurs
because it should be a test to see if the pings work when the cef switching
path is not used to route the packets. Ping -r forces packets to be process
switched. Losing routing to an entire vlan or subnet can still be a cef
problem as that's how the equipment stores routing and re-write information,
(It uses the subnet prefix). Since cef is the switching mechanism on the
sup2/msfc2 and we use the arp table to built the cef adjacency table, that's
the logical place to start?
I am very curious to see if anyone has run into something similar in their
6500 network.
Again.....my apologies for the OT.
Mike
Michael Schlenger
CCIE #7079
N2N Solutions
mschlenger@n2nsolutions.com
847.592.3912
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