Yes, the prefix-list is one of those few commands where the meaning actually changes depending on syntax. If you says 0.0.0.0/0 you are saying match EXACTLY the default route and only the default route. If you say 0.0.0.0/0 le 32 you are saying "match any prefix with any mask"
Another example !THIS MATCHES ONLY THE SINGLE PREFIX 192.168.10.0/24 ip prefix-list joe permit 192.168.10.0/24 ip prefix-list foo permit 192.168.10.0/24 le 28 This would match any prefix where the first 3 octets are 192.168.10 and where the mask is /28 or less so...some examples of what this would match (and many others) - 192.168.10.0/24 - 192.168.10.0/25 - 192.168.10.0/26 - 192.168.10.0/27 - 192.168.10.0/28 - 192.168.10.128/25 - 192.168.10.64/26 - 192.168.10.128/26 - 192.168.10.192/26 - 192.168.10.48/28 Essentially, 192.168.10.x where the mask is <= /28 On Wed, Apr 10, 2013 at 3:46 AM, Marta Sokolowska < [email protected]> wrote: > > 2013/4/10 Mike Rojas <[email protected]> > > Till yesterday I started to stay and try things out and continue with the >> labs. It work, I just dont understand why you have to put the "le 32". >> > > [...] > > If you will not specify "le 32", OSPF will look for the exact match, i.e. > prefix 0.0.0.0/0, which means "default route" - and in this lab you have > to match "any", not "default route" (you want to deny 2.2.2.2 and permit > all other routes). > > There's a nice article about prefix-lists: > http://packetlife.net/blog/2010/feb/1/understanding-ip-prefix-lists/ > > Hope it helps :-) > > -- > > Marta SokoĊowska. > > _______________________________________________ > 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 > -- Regards, Joe Astorino CCIE #24347 http://astorinonetworks.com "He not busy being born is busy dying" - Dylan
_______________________________________________ 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
