nanog mailing list archives
Re: Route table growth and hardware limits...talk to the filter
From: Bora Akyol <bora.akyol () aprius com>
Date: Thu, 20 Sep 2007 16:07:48 -0700
On 9/20/07 2:03 PM, "Jon Lewis" <jlewis () lewis org> wrote:
On Thu, 20 Sep 2007, Matt Liotta wrote:I was playing with a sup2 adding in extra routes to the point that it ran out of memory. Unfortunately, it didn't just drop routes like I thought it would. CEF disabled itself as well, which on a busy box would be a disaster. Is this what people expect will happen in a few months to people using sup2s? Or am I missing something else?That's not good. What software version was it running?
While it is not good, the alternative approach would leave an indeterminate routing table in hardware. Would you like the packets to go to randomized directions? The box is trying to do the right thing by turning off CEF and switching everything in software since in this case software is the only entity in the system with a consistent FIB. An alternate would be to use the hardware forwarding tables as a limited size cache (similar but not exactly as in the 7000 router). I am sure that this is a large software effort and whether the hardware can support this is questionable. SUP2 was a great RP with a really long life, but maybe it is time to move on to a SUP720 with the large table option and then grab a cold one ;-) Cheers, Bora
Current thread:
- RE: Route table growth and hardware limits...talk to the filter, (continued)
- RE: Route table growth and hardware limits...talk to the filter Alex Rubenstein (Sep 09)
- Re: Route table growth and hardware limits...talk to the filter Mark Tinka (Sep 09)
- Re: Route table growth and hardware limits...talk to the filter randal k (Sep 09)
- Re: Route table growth and hardware limits...talk to the filter Andy Davidson (Sep 09)
- Re: Route table growth and hardware limits...talk to the filter tony sarendal (Sep 09)
- Message not available
- RE: Route table growth and hardware limits...talk to the filter Church, Charles (Sep 11)
- Re: Route table growth and hardware limits...talk to the filter Kevin Oberman (Sep 12)
- Re: Route table growth and hardware limits...talk to the filter Matt Liotta (Sep 20)
- Re: Route table growth and hardware limits...talk to the filter Jon Lewis (Sep 20)
- Re: Route table growth and hardware limits...talk to the filter Bora Akyol (Sep 20)
- Re: Route table growth and hardware limits...talk to the filter Jon Lewis (Sep 20)
- Re: Route table growth and hardware limits...talk to the filter John A. Kilpatrick (Sep 21)
- Re: Route table growth and hardware limits...talk to the filter Pekka Savola (Sep 21)
- Re: Route table growth and hardware limits...talk to the filter Randy Bush (Sep 21)
- Re: Route table growth and hardware limits...talk to the filter Pekka Savola (Sep 21)
- Re: Route table growth and hardware limits...talk to the filter Randy Bush (Sep 21)
- Re: Route table growth and hardware limits...talk to the filter Michael Smith (Sep 21)
- Re: Route table growth and hardware limits...talk to the filter Pekka Savola (Sep 21)
- Re: Route table growth and hardware limits...talk to the filter Donald Stahl (Sep 21)