[c-nsp] Sup720 - FIB full, software switching

Spyros Kakaroukas skakaroukas at rolaware.com
Mon Feb 3 10:07:50 EST 2014


I don't think you can actually recover from that. What you might be able to do, depending on your design, is use selective route download (http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_bgp/configuration/15-s/irg-selective-download.html ) to prevent routes from overflowing your FIB in the first place. Obviously you'll need to be careful to avoid blackholing traffic.

Spyros Kakaroukas
IP Engineer

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-----Original Message-----
From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of "Rolf Han?en"
Sent: Monday, February 03, 2014 4:09 PM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] Sup720 - FIB full, software switching


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 the full table BGP session and cleared the others, the system now had a few routes only again.

But it started to drop packets, I saw no pattern, it looked nearly random.
I needed to reboot both boxes to resolve that issue.

IOS was s72033-advipservicesk9_wan-mz.122-33.SXJ.bin

Is there a way to avoid those issues by let it just ignoring routes not matching into the FIB?
Is there a command to reset the routing mode/routes back to CEF without reloading the box?

kind regards

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