Let's say ACL 1, 2 exist, and there is no ACL 3. How does a router treat packets against an ACL that doesn't exist in a route map?
We encounter this problem where R2 advertises a connected network with metric of 10. However, R3 will learn this network from R1 if "match ip add 3" is there, with metric of 110. If we take out 3 from the match statement, it will learn the route normally from R2. Why is that?
A sh ip route on R1,R2 & R3 for the prefix that ACL 3 was matching, before and after the match ip address 3 has been added and removed from R1 may help clarify. Also put in the relevant R2 OSPF configuration.
Longest match rule is used only for routing decisions ( how to route a packet) and not on whether to install a route or not. If two prefixes (say a /24 and /30) from the same major network comes, both of them will be installed no matter what the metric is or admin distance is.
If the same 2 prefixes are advertised by another routing protocol such as EIGRP, then the admin distance is considered for each of the prefixes.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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