December 2006
Intermediate to advanced
1188 pages
72h 8m
English
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Routing Over Multiple Paths with Equal Costs
Problem
You want to restrict how many paths your router can use simultaneously to reach a particular destination.
Solution
By default, the router will install up to four routes to the same destination for most routing protocols, except BGP where the default is one, and static routes that allow six. You can change this default to any value between one and sixteen by using the configuration command maximum-paths. In IOS versions before 12.3(2)T, the maximum number of paths was six:
Router#configure terminalEnter configuration commands, one per line. End with CNTL/Z. Router(config)#router ospfRouter(config-router)#65510maximum-pathsRouter(config-router)#2endRouter#
The same syntax works for other routing protocols:
Router#configure terminalEnter configuration commands, one per line. End with CNTL/Z. Router(config)#router eigrpRouter(config-router)#99maximum-pathsRouter(config-router)#2endRouter#
In IOS Version 12.2T, Cisco introduced a new command to allow you to configure the number iBGP paths separately from eBGP. You set the maximum number of eBGP paths using the standard maximum-paths command, and specify the number of paths for iBGP separately:
Router#configure terminalEnter configuration commands, one per line. End with CNTL/Z. Router(config)#router bgpRouter(config-router)#65511maximum-pathsRouter(config-router)#2maximum-paths ibgpRouter(config-router)#3endRouter#
IOS releases prior to 12.2T only include a standard maximum-paths ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.