Morgan Routers enter into their routing table routes to 'directly connected' networks. In this case I will assume that, 192.168.3.0 is a directly Connected Network for both RTA and RTB. This would be designated by C in the routing Table.
Even though you may be running IGRP on both routers, you are running them with different processes or AS numbers. IGRP processes with different AS's do not share information unless specifically configured to do so with the redistribute command. If however RTA was running EIGRP with Process 100 and RTB was running IGRP with Process 100, then the routers would share information. This is the only time you don't have to do 'work' to make two different routing protocols talk to each other. This of course only occurs when the Process numbers are the same for EIGRP and IGRP. If the AS numbers were different, then you once again have to revert to Redistribute commands to make the routers learn each others' routes. Looking at your example, the only 'common' network between RTA and RTB is 192.168.3.0, the rest are unique hence RTA not showing .8 and .5 networks and RTB not showing .2 and .5 networks Hope this clears this up. Manish -----Original Message----- From: Morgan Hansen [mailto:[EMAIL PROTECTED]] Sent: 04 July 2002 15:04 To: [EMAIL PROTECTED] Subject: AS numbers makes the difference right? [7:48099] Guys, im going completely mental over here! Im afraid my brain is going to go BOOM in a second! Heres the thing; Say you have 2 routers, with their respective routing tables right. Router-A have these networks in its routing tabel: 192.168.2.0 192.168.3.0 192.168.4.0 And Rouer-B has these: 192.168.3.0 192.168.8.0 192.168.5.0 Now, what makes me crazy here is that I know that by looking at this, I can tell that Router-A and Router-B have directly connected networks, and therefore in Router-Bs routing tabel all of Router-As networks + Router-Bs networks will show. But! Now this is a BIG BUT! If, say Router-A has the as number 100 (That is router igrp 100), and Router-B has the as number 101 (router igrp 101). Then they are NOT directly connected and therefor will not share routing table's right??? Or?? I mean, the as numbers decide this if im not entirelly wrong (which I most def could be) Please, like ive said im going totally bananas over this and need some help. If in fact Router-Bs routing table will show both Router-As and its own networks, then. Is this because of the use of IGRP? Cause im reading the Wendel Odom book here, and it says, I quote; "The following list summarizes the behavior of a router that uses the RIP-1 or IGRP distance vector routing protocols: -Routers add DIRECTLY CONNECTED subnets to their routing tables. Routers do not need to run a routing protocol to learn connected routes, but conneced subnets routes are advertised to neighboring routers by the routing protocol". Ok, this I know. But, im confused about the as numbers here (100 vs 101) Because of this I would figure that Yes, Router-Bs routing table would normally show us both Routers networks (being directly connected and all) BUT, not when the as numbers are different. Guys, am I totally missing the point here? Please help me figure this one out! Im loosing it :-( Morgan mailto:[EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=48106&t=48099 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
