nanog mailing list archives
Re: karl and paul, expostulating
From: "Alec H. Peterson" <ahp () hilander com>
Date: Thu, 20 Feb 1997 17:27:01 -0500
On Feb 20, 1997, Brett D. Watson wrote:
doesn't matter. in production ios, policy routing (source based routing) is process switched. there is code in the works to make it fast switched. but there is a bug wherein if you do policy routing, and you enable flow or optimum switching on the interface you're doing pr on , it disables the policy routing. that bug may be fixed now but in any case enabling flow switching will *not* speed up policy routing. and if you're exporting the flow stats, you lose anywhere from 50kpps to 100Kpps of speed.
I have news for you; this isn't policy routing! We aren't re-writting any source or destination addresses (which is what policy routing does). We're just filtering based on source and destination parameters (such as address, protocol, port, etc). Flow switching works very effectively (at least as of IOS 11.1.9).
but i'm assuming you aren't doing policy routing in this box nor exporting flow stats?
No, we aren't doing policy routing, but we do have an extended access list on at least one of our fast ethernet interfaces. The filtering works quite well, and flow switching makes the CPU load hit minimal. Alec -- +------------------------------------+--------------------------------------+ |Alec Peterson - ahp () hilander com | Erols Internet Services, INC. | |Network Engineer | Springfield, VA. | +------------------------------------+--------------------------------------+ - - - - - - - - - - - - - - - - -
Current thread:
- Re: karl and paul, expostulating Brett D. Watson (Feb 20)
- <Possible follow-ups>
- Re: karl and paul, expostulating Brett D. Watson (Feb 20)
- BOF minutes from NANOG meeting Michael Dillon (Feb 20)
- Re: karl and paul, expostulating Justin W. Newton (Feb 20)
- Re: karl and paul, expostulating Paul A Vixie (Feb 20)
- Re: karl and paul, expostulating Brett D. Watson (Feb 20)
- Re: karl and paul, expostulating Alec H. Peterson (Feb 20)
- Re: karl and paul, expostulating Mark Borchers (Feb 21)