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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Route table growth and hardware limits...talk to the filter
On 9/20/07 2:03 PM, "Jon Lewis" <[email protected]> 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
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