On Thu, 19 Sep 2002, JohnZ wrote:

> Can I use access-list to produce the same effect as prefix-list ? Any
> thoughts on which is a better way to use in redistribution over other. I am
> just trying to find which one I should stick with.
> Thanks

> ip prefix-list test seq 5 deny 199.172.4.0/24
> ip prefix-list test seq 10 deny 199.172.6.0/24
> ip prefix-list test seq 15 deny 199.172.8.0/24
> ip prefix-list test 20 permit 0.0.0.0/0 le 32

Prefix lists can permit annoucements in a range of netmasks. For example,
the following prefix-list entry will permit announcements of
192.168.1.0/24, or any prefix within that.

ip prefix-list example seq 5 permit 192.168.1.0/24 le 32

I don't believe there's a way to do that using access-lists.

The other major advantage is you can pull entries out of a sequence, and
insert them without re-writing the entire prefix-list again. For example,
'no ip prefix-list example seq 10' will remove only sequence 10, rather
than the entire prefix list.

These two features however need to ba taken with a grain of salt. Firstly
you may want explicit routing control rather than a blanket cover, and
secondly configurations like this are usually built out of databases so
you're not going to be manually inserting entries.

Rgds,




- I.

--
Ian Henderson CCNA, CCNP
Senior Network Engineer, Chime Communications




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