From: Kenneth Wygand (KWygand@customonline.com)
Date: Sat Jul 10 2004 - 17:34:14 GMT-3
Adel,
So basically the reference point is from the FIB even though the distribute-list is placed under the routing protocol process, if I understand correctly.
One question on your first bullet point (Only those OSPF previxes will be considered for redistribution, that are installed in FIB, in other words - you see them in the output of "show ip route ospf").
Isn't all redistribution based upon routes that are active within the FIB? If I redistribute OSPF 1 into RIP, won't only routes active in the FIB be redistributed, as opposed to other routes in OSPF's LSA database?
Thanks again, this was a great explanation!
Ken
________________________________
From: Adel Abouchaev [mailto:adel@netmasterclass.net]
Sent: Sat 7/10/2004 3:56 PM
To: Kenneth Wygand
Cc: ccielab@groupstudy.com
Subject: Re: distribute-list out (at the process-level)
1. Redistribution between two routing processes:
You have OSPF 1 and RIP on your router. You want to limit prefixes
redistributed from OSPF into RIP. So you configure "distribute-list 10
out ospf 1" under RIP. By this, when you perform rediistribution under
rip "redistribute ospf 1 metric 1":
1. Only those OSPF prefixes will be considered for
redistribution, that are installed in FIB,
in other words - you see them in the output of "show ip route ospf".
2. Only those OSPF prefixes will be redistributed into RIP
_out_ of routing table, that are
allowed by the access-list (10) that you reference in the
distribute-list command.
2. You have OSPF 1 process on the router. You want to filter some
prefixes from being installed
into the FIB, so you would not see them in "show ip route ospf". Then
you configure an access-list,
denying these networks, allowing everything else, then you configure
"distribute-list 10 in", under router OSPF. Now, the denied prefixes
will not be installed _in_ FIB.
That's basically all about _in_'s and _out_'s :) It's not complicated at
all, but is just a matter of watching the directions from the correct
starting point.
Cheers,
Adel.
Kenneth Wygand wrote:
>Hi Adel,
>
>I'm sorry but I don't understand completely. Can you illustrate with an example?
>
>Thanks very much in advance! :)
>Ken
>
>________________________________
>
>From: Adel Abouchaev [mailto:adel@netmasterclass.net]
>Sent: Sat 7/10/2004 3:44 PM
>To: Kenneth Wygand
>Cc: ccielab@groupstudy.com
>Subject: Re: distribute-list out (at the process-level)
>
>
>
>It's better thought (when it's a redistribution distribute-list, not a
>filtering distribute list) as "in" and "out" of FIB. Redistribution
>takes prefixes from FIB for the source protocol and brings them into the
>destination protocol. When doing just "in", for example, you will filter
>prefixes from being installed into FIB.
>
>Cheers,
>Adel Abouchaev
>CCIE# 12037
>www.netmasterclass.net
>
>
>Kenneth Wygand wrote:
>
>
>
>>Hello everyone!
>>
>>I have a question regarding redistribution at the process level.
>>
>>Lets say we have the following situation:
>>
>><SNIP>
>>router ospf 1
>> distribute-list 1 out eigrp
>>!
>>router eigrp 1
>> network x.x.x.x y.y.y.y
>></SNIP>
>>
>>The way I remember what this command does is that it applies distribute-list 1 for routes redistribute "out -OF- EIGRP", so this would affect routes that are moving from the EIGRP routing process into the OSPF routing process.
>>
>>Now for my question: Does the "distribute-list" command work the same way within all routing processes? Are there any other type of "unintuitive" distribute-list process-level commands that might not work the way as expected?
>>
>>Thanks!
>>Ken
>>
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