ISIS uses CLNS to form adjancies. IP has nothing to do with it. It'll form adjancies, if I'm not mistaken, even when router A and B are on different subnets. >From: "McCallum, Robert" >Reply-To: "McCallum, Robert" >To: "'Ccielab' (E-mail)" , >"Cisco@Groupstudy. Com (E-mail)" >Subject: Unusual Aspect of a duplicate IP Address >Date: Thu, 12 Apr 2001 16:59:32 +0100 > >Here is a scenario which caught me out BIG time in a real life situation >using ISIS. > >To make it easier > >Router A has a serial connection to Router B > > >Everything is up layer 1 & 2i.e CDP can indeed see Router B if you are on >Router A and vice versa. Router B can't see any routes from Router A or >beyond. > >NOW Routers A serial 0's ip address is 172.16.130.5, Routers B serial 0's >ip address is 172.16.130.5. > >Spot the deliberate mistake. > >Although you say AHA he has the same ip address on the serial connections. >SO, quite rightly ISIS says, go away I will never make an adjacency with >myself !!!! :-( > >However, it took me quite a while to discover that these IP addresses were >indeed duplicated. > >REASON or should I make it a question? I think question would be better. > >Q: What do you think would happen if I was on Router A and telnetted to >172.16.130.5, would I telnet to Router A or B. :-> > >A: This is why it took me a while to realise this. I started debugging >adjacencies, blaming a new controller card which was the first time I had >used this in ISIS, everything bar the easy problem. Mental Note for me >here >is don't dive in head first, always fault find the layers and remember this >fault because it is nasty!!!! :- >What made it worse was the customer sitting over my shoulder saying WHY >isn't this working, I knew we shouldn't have bought those new fangled >router >things!!!!! > >Oh the joys of life!!!! _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=376&t=376 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
