From: Peter Kingston (kingstonp.ccie@gmail.com)
Date: Thu Aug 02 2007 - 00:29:16 ART
I was under the impression that prefix-lists aren't supported for RIP.
Please correct me if I am wrong.
-- Regards,Peter Kingston Studying my CCIE
On 8/2/07, Toh Soon, Lim <tohsoon28@gmail.com> wrote: > > Hi All, > > I have this lab scenario. R1 learns the following RIP routes: > > R1#sh ip ro ri > R 192.168.4.0/24 [120/1] via 150.50.200.254, 00:00:07, FastEthernet0/1 > R 192.168.1.0/24 [120/1] via 150.50.200.254, 00:00:07, FastEthernet0/1 > R 192.168.2.0/24 [120/1] via 150.50.200.254, 00:00:07, FastEthernet0/1 > R 192.168.3.0/24 [120/1] via 150.50.200.254, 00:00:07, FastEthernet0/1 > Question 1 > --------------- > Filter the 192.168.4.0. My first thought of the solution is as follows: > > ! > access-list 1 deny 192.168.4.0 > access-list 1 permit any > ! > router rip > distribute-list 1 in Fas0/1 > ! > > It works. My practice of matching routes when using standard ACL is > without > the wildcard mask, i.e. it defaults to 0.0.0.0. But I've seen some people > configure the mask e.g. "access-list 1 deny 192.168.4.0 0.0.0.255". I > don't > see any problems with both methods in this case because the received > prefix > addresses will be Logical ANDed to the wildcard mask and then match to the > address in the ACL. Though I always think that the latter method is > typically for matching traffic, e.g. ACLs applied to interfaces for packet > filtering. Do correct me if my concept is wrong. > > I could also configure using prefix-list: > > ! > ip prefix-list BLOCK4 seq 5 deny 192.168.4.0/24 > ip prefix-list BLOCK4 seq 10 permit 0.0.0.0/0 le 32 > ! > router rip > distribute-list prefix BLOCK4 in Fas0/1 > ! > > Kindly clear my doubts on which method conforms to best practice and > should > be typically used in the lab exam. > > Question 2 > --------------- > If neighboring routers are sending RIPv1, make sure R1 does not pay > attention to updates. > > I solved this by configuring "ver 2" under "router rip", i.e. R1 will > send/receive only v2 updates. Mixing RIPv1 and RIPv2 operations can > sometimes make me very confused. Is it really important to know RIPv1 in > details? > > > Thank you. > > B.Rgds, > Lim TS > > _______________________________________________________________________ > Subscription information may be found at: > http://www.groupstudy.com/list/CCIELab.html
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