High CPU on 6509 due to CEF Process

Unanswered Question
Oct 8th, 2009

I'm routinely seeing CPU spikes due to CEF process on one of my 6509s. I was wondering if anyone has some more information on the CEF process and what might be causing the issue. The sup is a 720-3BXL with a MSFC3 running Cat IOS

12.2(18)SXF6. I've read through Document ID: 63992 and also searched through the bug database but have come up empty. Any ideas?

CPU utilization for five seconds: 83%/34%; one minute: 17%; five minutes: 19%

PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process

173 574500720 75540189 7605 41.27% 4.88% 5.22% 0 CEF process

175 269270112 51621894 5216 5.19% 0.62% 0.70% 0 L3 Manager

157 18247176 2088968 8735 1.43% 0.26% 0.17% 0 IP RIB Update

268 308 363 848 0.23% 0.29% 0.09% 3 Virtual Exec

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ldunston Thu, 10/08/2009 - 12:00

I've also run a couple of debugs against for CEF events and the CEF table.

It appears to be scanning the entire bgp route table (I'm receiving full routes).

1y30w: Path 0 for prefix 138.235.34.0/24 (flags 3)

1y30w: Path 0 for prefix 138.235.33.0/24 (flags 3)

1y30w: Path 0 for prefix 138.235.4.0/23 (flags 3)

1y30w: Path 0 for prefix 193.184.165.0/24 (flags 3)

1y30w: Path 0 for prefix 193.184.230.0/24 (flags 3)

1y30w: Path 0 for prefix 193.186.2.0/24 (flags 3)

1y30w: Path 0 for prefix 193.186.3.0/24 (flags 3)

1y30w: Path 0 for prefix 193.186.5.0/24 (flags 3)

1y30w: Path 0 for prefix 193.186.6.0/24 (flags 3)

1y30w: Path 0 for prefix 193.186.7.0/24 (flags 3)

1y30w: Path 0 for prefix 193.186.8.0/24 (flags 3)

1y30w: Path 0 for prefix 193.186.10.0/24 (flags 3)

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