From: ccie2be (ccie2be@nyc.rr.com)
Date: Tue Aug 26 2003 - 09:31:50 GMT-3
Hey Jeff,
One of the things I do in this situation is determine the nature of the
issue; that is which routing protocols am I dealing with and do the routing
protocols tag routes redistributed into them.
For example, if the routing protocols are Eigrp and OSPF, I don't have to
worry about route reflection. A route redist into Eigrp from OSPF won't be
redist back into OSPF.
If, however, one of the routing protocols tagged routes as external but the
other routing protocol doesn't, then I have to filter - but only from one
side. For example, if the 2 protocols are OSPF and RIP, then a filter is
needed when redist from rip to ospf but not when redist from ospf to rip.
Another thing to keep in mind when configuring redist is classful versus
classless. This isn't specific to multi point redist but it's very
important. Make sure you know how to summarize routes in all the classless
routing protocols, especially OSPF and BGP because when redist to a classful
routing protocol only routes with the same subnet mask length as the
classful protocol is using will get redist. For example, you can't redist
x.x.x.x/26 into RIP when RIP is only knows about y.y.y.y/24 routes.
One last thought - I only learned about this one fairly recently. You can't
redist routes multiple times on a single router. For example, let's say a
router is running 2 routing protocols, rip and ospf and you have static
routes or connected routes on the router. You can't redist the static into
rip and then expect the static routes to be redist from rip into ospf. You
have to explicitly redist the static routes into both rip and ospf.
As a second to last suggestion, I would read Doyle chapter on redistribution
again and go through all the review questions and exercises at the end of
the chapter until you know that stuff cold.
Lastly, after configuring redist, I would verify with a show ip route on all
the routers that all the routes that should be in the route table are there.
Hope this helps. dt
----- Original Message -----
From: "Jeff Colburn" <willbccie@yahoo.com>
To: <ccielab@groupstudy.com>
Sent: Tuesday, August 26, 2003 7:24 AM
Subject: Multiple Point Route Redistribution
> I am quickly approaching my lab date and I feel that I still have one
critical weakness, route redistribution between multiple points. I have
been successful using distance commands and route maps when the points are
between a protocol on the edge being redistributed into the core protocol.
I have been running into difficulty when several protocols are running and
redistribution is done at various points in the network. I feel I spend too
much time tweaking distances and map statements to eliminate the sub-optimal
routes.
> Does anyone have a good general practice or approach when tackling this
task?
>
> Thanks,
>
> Jeff Colburn
>
>
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