nanog mailing list archives
Re: So Philip Smith / Geoff Huston's CIDR report becomes worth a good hard look today
From: Randy Bush <randy () psg com>
Date: Thu, 14 Aug 2014 15:13:53 +0900
you mean your vendor won't give you the knobs to do it smartly ([j]tac tickets open for five years)? wonder why.Might be useful if you mentioned what you considered a "smart" way to trim the fib. But then you couldn't bitch and moan about people not understanding you, which is the real reason you post to NANOG.
i did not get the original of this post, but the ad hominem speaks for it pathetic self.
Optimization #1 -- elimination of more specifics where there's a less specific that has the same next hop (obviously only in cases where the less specific is the one that would be used if the more specific were left out). Example: if 10.10.4.0/22 has the same next hop as 10.10.7.0/24, the latter can be left out of TCAM (assuming there's not a 10.10.6.0/23 with a different next hop). Optimization #2 -- concatenation of adjacent routes when they have the same next hop Example: If 10.10.12.0/15 and 10.10.14.0/15 have the same next hop, leave them both out of TCAM and install 10.10.14.0/14 Optimization #3 -- elimination of routes that have more specifics for their entire range. Example: Don't program 10.10.4.0/22 in TCAM is 10.10.4.0/23, 10.10.6.0/24 an 10.10.7.0/24 all exist
those are some of the cases. i guess i should dig up the old [j]tac tickets. randy
Current thread:
- Re: So Philip Smith / Geoff Huston's CIDR report becomes worth a good hard look today, (continued)
- Re: So Philip Smith / Geoff Huston's CIDR report becomes worth a good hard look today manning bill (Aug 13)
- Re: So Philip Smith / Geoff Huston's CIDR report becomes worth a good hard look today Steve Noble (Aug 13)
- Re: So Philip Smith / Geoff Huston's CIDR report becomes worth a good hard look today Owen DeLong (Aug 14)
- Re: So Philip Smith / Geoff Huston's CIDR report becomes worth a good hard look today Dorian Kim (Aug 13)
- Re: So Philip Smith / Geoff Huston's CIDR report becomes worth a good hard look today Dorian Kim (Aug 13)
- Re: So Philip Smith / Geoff Huston's CIDR report becomes worth a good hard look today Randy Bush (Aug 13)
- Re: So Philip Smith / Geoff Huston's CIDR report becomes worth a good hard look today Patrick W. Gilmore (Aug 14)
- Re: So Philip Smith / Geoff Huston's CIDR report becomes worth a good hard look today Patrick W. Gilmore (Aug 14)
- Re: So Philip Smith / Geoff Huston's CIDR report becomes worth a good hard look today Aris Lambrianidis (Aug 14)
- Re: So Philip Smith / Geoff Huston's CIDR report becomes worth a good hard look today Chris Adams (Aug 13)
- Re: So Philip Smith / Geoff Huston's CIDR report becomes worth a good hard look today Randy Bush (Aug 13)
- RE: So Philip Smith / Geoff Huston's CIDR report becomes worth a good hard look today Vitkovský Adam (Aug 15)
- Announcement: FlowViewer v4.4 Released Joe Loiacono (Aug 18)