From: James Matrisciano (jmatrisciano@kenttech.com)
Date: Sat Dec 10 2005 - 00:20:22 GMT-3
Don't forget the distance command. It is very usefull when you are not
allowed to filter your redistribution.
Example...
In the rip domain you have
1.1.1.0/24
2.2.2.0/24
3.3.3.0/24
Build an access-list
IP access-list stand rip
Per 1.1.1.0 0.0.0.255
Per 2.2.2.0 0.0.0.255
Per 3.3.3.0 0.0.0.255
Int the rip routing process apply a distance command with the access
list
Router rip
Distance 89 0.0.0.0 255.255.255.255 rip
This will apply the AD of 89 to any network, you shrink the any network
with the use of the ACL, so now it will match only on what you have
inside your acl, so now your three internal networks have an AD of 89.
You mostly want to use this technique when there is a routing loop (R3
and R4 both in RIP and redistributing in another routing protocol).
Now you will retain full reachability and controle your internal RIP
domain so you are not leaving the domain by routes learned from out side
of your network. But you are also not limiting yourself by not learning
about your internal rip network only from rip speaking routers, in the
case that a rip connection fails and you need to reach a network on the
other side of the failed rip interface.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
lim es
Sent: Friday, December 09, 2005 10:12 PM
To: ccielab@groupstudy.com
Subject: route redistribution thoughts and ways
Hi Group,
I am reflecting upon the methods and ways of doing redistribution.
So far, i am only depending on a single easy way of doing this:
using route tags. tag it on the way to target, when coming back fr
target, block it.
After thinking of alternatives:
1) i conclude that anything being redistributed back to eigrp is safe,
because of eigrp's use of int and ext AD.
It will always prefer its own int routes
2) Also anything being redistributed back to ospf is
ok
because , they end up being ext type routes, ospf is going to select
based on route types followed by metrics values right?
3) when redistributing from ospf, use the optional ospf parameters
(internal, external1,2) to control what routes to send
4) any other...???
Other thoughts:
r1-----r2-----r3
Is the sequence of redistribution important?
r1 to R2, R2 to R3 etc??
appreciate any comments and ideas
TIA
ES Lim
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