From: simon hart (simon.hart@btinternet.com)
Date: Tue Apr 05 2005 - 18:03:58 GMT-3
Hi John,
You cannot use the offset list to make a route(s) unreachable with eigrp,
although you can do this with rip.
Rip has the philosophy that an infinite metric......anything over 15..... is
unreachable, therefore making the metric 16 effectively makes those routes
effected by the offset list unreachable.
Eigrp does not have the same philosophy, the composite metric in eigrp can
be anything and as far as the protocol is concerned it is still reachable
(within the confines fo FD's and FS's etc. etc.)
The example you have given in RIP environment would dictate that every route
advertised out of that interface would unreachable (bearing in mind that you
could not use 255 in RIP, it would have to be 16). This really would seem a
little pointless, may as well make the interface passive.
If you used the example below for eigrp you would be advertising eigrp with
a metric of 255, and probably making those routes the most favourable.
Eigrp uses a composite metric, derived by default as function of bandwidth
and delay. The metrics are normally quite high, in fact a lot higher than
255 (for information the highest eigrp figure you can use on the offset list
is 2147483647).
In order not to advertise to the next hop router you could use:
router eigrp 100
distribute-list 10 out s0/0
access-list 10 deny 0.0.0.0 255.255.255.255
Change the access list if you wish to deny a subset of routes.
HTH
Simon
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
John Matus
Sent: 05 April 2005 21:30
To: ccielab@groupstudy.com
Subject: blocking eigrp routes
if i wanted to block all eigrp routes from exiting to the next hop would it
be:
offset-list 1 out 255 s0/0
access-l 1 permit 0.0.0.0 255.255.255.255 ?
i wasn't sure since rip's metric would be '16' for offset but i'm not sure
about eigrp.
thanks in advance
This archive was generated by hypermail 2.1.4 : Tue May 03 2005 - 07:54:53 GMT-3