From: Adel Abouchaev (adel@netmasterclass.net)
Date: Sat Jul 10 2004 - 17:40:33 GMT-3
That's correct. Only routes in FIB will be redistributed, not routes
from OSPF database.
Cheers,
Adel.
Kenneth Wygand wrote:
>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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