From: Joe Martin (jmartin@capitalpremium.net)
Date: Wed Feb 19 2003 - 19:43:25 GMT-3
Patrick,
There are multiple ways to accomplish mutual redistribution with multiple
redistribution points.
However, (IMHO) the best way to accomplish this task is to alter AD.
Basically, the AD of both routing protocols on all redistribution points is
changed to a mutually high number using the distance command. (i.e. change
the AD of both RIP and OSPF to 130). Then use the "distance xxx 0.0.0.0
255.255.255.255 xxx" command to set the AD of all routes internal to that
routing protocol to the default AD. (110 for OSPF, 120 for RIP).
This will effectively set the AD of internal routes to the original default
AD (110 for OSPF), and set the AD of redistributed routes to the higher
number.
This way the router will prefer the OSPF routes through OSPF and the RIP
routes through RIP; Yet it will still allow for the fault tolerance
inherent in a network with multiple redistribution points.
This is obviously a generalization, so please, no one send me any emails
saying that this will not work in all scenarios. For example, the scenario
may say that fault tolerance is not necessary, in which case you could just
use distribute-lists.
See the following link for a modified example (watch the wrap):
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/ip_c
/ipcprt2/1cdindep.htm#1001842
Hope that wasn't too confusing. There are some other excellent examples on
CCO.
HTH,
Joe Martin
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Brown, Patrick (NSOC-OCF}
Sent: Wednesday, February 19, 2003 12:34 PM
To: ccielab@groupstudy.com
Subject: redistribution ( mutual, route feedback, 2 redist points,
taging, etc..)
Group,
I know this question has came up sometime before in this distribution
list. I hear all the time there are multiple ways to do one thing, but
you need to do the right way(Cisco way) when doing the lab.
Is there a model redistribution format to live by when doing different
redistribution types? Example: rip to ospf, eigrp to ospf, isis to ospf,
eigrp to rip, when to use distance, when not to use distance, when to
use tags, when not to use tags, when to use distribute-list, etc. In a
real world environment you would always want optimal routing, but in
most CCIE lab scenarios they have sub-optimal routing, with the end goal
of every interface reachable accomplished. Would this be acceptable in
the CCIE lab? I don't what to waste time trying to make optimal paths
for every route/router in the internetwork.
If someone has good redistribution notes or documents they can point me
to, it will be well appreciated. Any good sites to!
Thanks,
Patrick
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