Hi,
today I saw 2x Sup720-3B (default 192K IPv4 routes) that received a full
table.
After FIB was filled IOS gave a warning that it now may forward in
software (and resetted all BGP sessions because of memory issues). I don't
have the exact messages.
The real problem occured after that. I shut
Hi,
On Mon, Feb 03, 2014 at 03:09:07PM +0100, Rolf Hanßen wrote:
today I saw 2x Sup720-3B (default 192K IPv4 routes) that received a full
table.
After FIB was filled IOS gave a warning that it now may forward in
software (and resetted all BGP sessions because of memory issues). I don't
have
I've never tried it, but you might be able to create a MLS rate
limiter/CoPP policy to drop all the FIB Miss packets from being punted and
try to reset the HW CEF table and see if that works. I doubt it will, but
in a pinch it could be worth a try.
On Mon, Feb 3, 2014 at 9:09 AM, Rolf Hanßen
Simple answer: No.
One of the major design errors of the FIB in the Sup720.
Unfortunately, once the FIB is full, the only way to get it back to normal is
to restart the whole box.
CFIB-SP-STBY-7-CFIB_EXCEPTION : FIB TCAM exception, Some entries will be
software switched
better than having the whole box stuck in process switching.
adam
-Original Message-
From: cisco-nsp [mailto:cisco-nsp-boun...@puck.nether.net] On Behalf Of
Rolf Hanßen
Sent: Monday, February 03, 2014 3:09 PM
To: cisco-nsp@puck.nether.net
Subject: [c-nsp] Sup720 - FIB full, software
One other thing I noticed from your email and something that we've
experienced in the past as well. I think it may also be related to
hitting the TCAM limit but check to see if you have this command enabled:
mls rate-limit unicast cef receive 1 255
According to Cisco, that command will
, February 03, 2014 4:09 PM
To: cisco-nsp@puck.nether.net
Subject: [c-nsp] Sup720 - FIB full, software switching
Hi,
today I saw 2x Sup720-3B (default 192K IPv4 routes) that received a full table.
After FIB was filled IOS gave a warning that it now may forward in software
(and resetted all BGP
Hi,
indeed, the limiter was installed.
kind regards
Rolf
One other thing I noticed from your email and something that we've
experienced in the past as well. I think it may also be related to
hitting the TCAM limit but check to see if you have this command enabled:
mls rate-limit unicast
On 2/3/14 7:03 AM, Adam Vitkovsky wrote:
Is there a way to avoid those issues by let it just ignoring routes not
matching into the FIB?
Hi Rolf,
Unfortunately the only option is to reset the bgp neighbor after the number
of received routes crosses a certain threshold.
neighbor x.x.x.x
There is a field upgrade available from Cisco for the 3B to convert it
to a 3BXL that as I recall was fairly cheap, and was pretty simple to
install.
--
Don
On 2/3/2014 9:09 AM, Rolf Hanßen wrote:
Hi,
today I saw 2x Sup720-3B (default 192K IPv4 routes) that received a full
table.
After FIB
On 02/03/2014 06:09 AM, Rolf Hanßen wrote:
But it started to drop packets, I saw no pattern, it looked nearly random.
I needed to reboot both boxes to resolve that issue.
That pretty much sums it up.
You can set up some inbound filtering to prevent a lot of routes to go
into the routing table
Hi,
On Mon, Feb 03, 2014 at 10:24:56AM -0500, Lobo wrote:
Thanks to the other replies about having to reload the switch to clear
the TCAM exception. I didn't know that once you hit it that the only
way to fix it was to completely reload the box.
Been there, done that. Affected only very
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