Quoting [EMAIL PROTECTED]: > On Tue, Feb 26, 2008 at 10:07:56PM +0100, Matyas Koszik wrote: >> >> >> You may want to try >> >> bgp bestpath as-path multipath-relax > > not available on 6509/sup720BXL > > Router(config-router)#bgp bestpath ? > compare-routerid Compare router-id for identical EBGP paths > cost-community cost community > med MED attribute
Apparently it's a hidden command, and our IOS/hardware took it: #sh ver [...] Cisco IOS Software, 7200 Software (C7200-PK9U2-M), Version 12.4(10), RELEASE SOFTWARE (fc1) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2006 by Cisco Systems, Inc. Compiled Wed 16-Aug-06 07:33 by prod_rel_team ROM: System Bootstrap, Version 12.3(4r)T3, RELEASE SOFTWARE (fc1) BOOTLDR: 7200 Software (C7200-KBOOT-M), Version 12.3(15b), RELEASE SOFTWARE (fc1) router01 uptime is 1 year, 18 weeks, 6 days, 10 hours, 19 minutes System returned to ROM by power-on System restarted at 16:56:45 CDT Wed Oct 18 2006 System image file is "disk2:c7200-pk9u2-mz.124-10.bin" [...] Cisco 7206VXR (NPE-G1) processor (revision B) with 983040K/65536K bytes of memory. Processor board ID 21280913 SB-1 CPU at 700MHz, Implementation 1025, Rev 0.2, 512KB L2 Cache 6 slot VXR midplane, Version 2.1 [...] #sh conf router bgp xxxx no synchronization bgp always-compare-med bgp log-neighbor-changes bgp bestpath as-path multipath-relax bgp bestpath compare-routerid bgp dampening Yet: #bgp bestpath ? compare-routerid Compare router-id for identical EBGP paths cost-community cost community med MED attribute Jeff C. >> to achieve load-sharing accross the providers, with different (but equal >> length) as-paths. (Works for me like a charm in a situation similar to >> yours.) >> >> >> >> >> On Tue, 26 Feb 2008, Jeff Chan wrote: >> >> > Hi All, >> > Given multiple, roughly equal upstreams (Sprint, ATT, Level3) >> > providing full BGP tables to a small ISP, what's the best way to >> > balance the outbound traffic? The problem is that all else being >> > equal (path length, local pref, etc.) BGP decides to take the one with >> > the lowest peering IP address. Given that the upstreams have >> > many/most of the same customers and peers, the peer with the lowest IP >> > address seems to win too often, meaning it does too much outbound >> > compared to the others. >> > >> > I asked the same question some time ago and the common practice answer >> > seemed to be prefer traffic for some other large networks (UUNet, >> > Qwest, AOL, etc.) over the peers with higher IP address. Is this >> > still the case? Seems kind of an ugly hack, but it works. >> > >> > Are there any other approaches? How about jumbling up or staggering >> > the local preferences: >> > >> > ISP S: >> > >> > customers: localpref 120 >> > peers: localpref 110 >> > others: localpref 100 >> > >> > ISP A: >> > >> > customers: localpref 110 >> > peers: localpref 100 >> > others: localpref 90 >> > >> > ISP L: >> > >> > customers: localpref 100 >> > peers: localpref 90 >> > others: localpref 80 >> > >> > Where S has the highest IP address, A next highest, L lowest. Haven't >> > tried this; just a thought to try to compensate for the IP address >> > decision. >> > >> > Cheers, >> > >> > Jeff C. >> > >> > _______________________________________________ >> > cisco-nsp mailing list cisco-nsp@puck.nether.net >> > https://puck.nether.net/mailman/listinfo/cisco-nsp >> > archive at http://puck.nether.net/pipermail/cisco-nsp/ >> > >> >> _______________________________________________ >> cisco-nsp mailing list cisco-nsp@puck.nether.net >> https://puck.nether.net/mailman/listinfo/cisco-nsp >> archive at http://puck.nether.net/pipermail/cisco-nsp/ > _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/