From: Cisco Nuts (cisconuts@hotmail.com)
Date: Mon Dec 12 2005 - 03:03:15 GMT-3
Also to add:
Don't forget about redistribute connected:
Say you have Ospf running on a router and they ask you to redistribute a
connected Lan intf. into Ospf along with the Loopback.
Then later on, they ask you to configure Eigrp/Rip on the same router and
redistribute the same connected Lan intf. into Eigrp/Rip and also do a
mutual redistribution b/w Ospf and Eigrp and Rip,
then if you do a forget to redistribute the connected Ospf or Eigrp/Rip
intf. along with the connected Lan intf. and loopback then you will not
see those routes in your neighbor's routing table for either of the 3
routing protocols.
connected > Ospf and Ospf > Rip does NOT mean the same connected > Rip
!!
Another one to add maybe for an IBGP peer router A not running an IGP
with it's neighbor B and is advertising a BGP route to this neighbor but
this neighbor has Synchronization turned on Therefore for a 3rd neighbor
C peering with B, to receive the BGP route of A, B must redistribute BGP
into the IGP (always via a route-map) AND also must have the bgp
redistribute-internal command. And also on B and C, might need to
configure the bgp distance 20 109 109 cmd so that the BGP route does not
get overwritten by the IGP route (Ospf in this case)..........!!!!!
Regard.
--------------------------------------------------------------------
From: "James Matrisciano" <jmatrisciano@kenttech.com>
Reply-To: "James Matrisciano" <jmatrisciano@kenttech.com>
To: "lim es" <tiga72@yahoo.com>, <ccielab@groupstudy.com>
Subject: RE: route redistribution thoughts and ways
Date: Fri, 9 Dec 2005 22:20:22 -0500
>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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