One thing I've not heard anyone mention is that it's not always possible to prevent a routing loop with tag/filter. If the routing loop is caused by administrative distance you may need to use the distance command to resolve the issue. Just my 2 cents.
________________________________ From: Ray Courtney <[email protected]> To: N. Max Pierson <[email protected]>; marc abel <[email protected]> Cc: [email protected] Sent: Saturday, January 28, 2012 12:45 PM Subject: Re: [OSL | CCIE_RS] Routing loops Thanks everyone, this is interesting. I always use the IPX taught route-maps like so: route-map rip2eigrp deny 10 match tag 90 ! route-map rip2eigrp permit 15 match tag 20 set tag 20 ! route-map rip2eigrp permit 20 set tag 120 but I got screwed up redistributing BGP and EIGRP as I can't seem to tag on BGP route-maps. What's the trick there? From: N. Max Pierson [mailto:[email protected]] Sent: 28 January 2012 17:21 To: marc abel Cc: Ray Courtney; [email protected] Subject: Re: [OSL | CCIE_RS] Routing loops I would have to agree with Marc here. Routing loops can affect so many different things, I always try and make sure to use route-maps at ANY redistribution point. If there's one way in and out, i'll usually skip tagging and filtering, but if there's 2 or more points of entry and exit with mutual redistribution, I ALWAYS tag and filter. In some cases it isn't necessary, however if I have the extra 5 or 10 minutes to build in the filtering logic, extra config can't hurt here for the most part. I'd rather burn the extra few minutes if I have it than leave a loop that would possibly cost you even more points due to other task requirements. - max On Sat, Jan 28, 2012 at 10:11 AM, marc abel <[email protected]> wrote: I think that depends on if other things are affected. Most likely you are going to fail, because it is probably going to break your multicast, oer, igp, bgp, etc etc. But if it somehow only affected your igp, then maybe you wouldn't. On Sat, Jan 28, 2012 at 8:25 AM, Ray Courtney <[email protected]> wrote: > Hi Everyone, > > > > I've just finished a Vol3 Lab did pretty good, but ended the day with a > vicious routing loop. > > > > In the real lab would this mean you automatically fail miserably or > would you just lose the 3 points for "make sure all loopbacks are > reachable, using redistribution where necessary"? > > > > Cheers > > > > Ray > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > Are you a CCNP or CCIE and looking for a job? Check out > www.PlatinumPlacement.com > > http://onlinestudylist.com/mailman/listinfo/ccie_rs > _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com http://onlinestudylist.com/mailman/listinfo/ccie_rs _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com http://onlinestudylist.com/mailman/listinfo/ccie_rs _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com http://onlinestudylist.com/mailman/listinfo/ccie_rs
