From: Stephen Hull (shull@getsouthern.com)
Date: Sun Jul 24 2005 - 12:44:15 GMT-3
Thanks Brian,
That's what I was looking for. Just wanted to see the process and think
it through.
Thanks,
Stephen
-----Original Message-----
From: Brian McGahan [mailto:bmcgahan@internetworkexpert.com]
Sent: Saturday, July 23, 2005 10:45 PM
To: Stephen Hull; Sayeed Kachroo; ccielab@groupstudy.com
Subject: RE: Redistribution and RIBs
Stephen,
The redistribution process looks specifically at the routing
table. I.e. if you are redistributing RIP into another protocol the
router internally says "show ip route rip", and then "show ip route
connected" and takes any up/up connected interfaces that are included by
"network" statements under the RIP process. You can however "break"
this second step of redistribution by manually filtering a "redistribute
connected" into the protocol that you are redistributing RIP into.
As of current releases IS-IS acts a little different since it is
not an IP protocol. It will only redistribute the routes that match the
"show ip route isis" and not the connected interfaces that have the "ip
router isis" statement on them. In other words if you are
redistributing IS-IS into OSPF you will also have to manually say
"redistribute connected subnets" under the OSPF process to get the
interfaces that are running IS-IS.
HTH,
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
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> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Stephen Hull
> Sent: Saturday, July 23, 2005 9:39 PM
> To: Sayeed Kachroo; ccielab@groupstudy.com
> Subject: RE: Redistribution and RIBs
>
> Thanks for the reply. What I am really interested in is how the
router
> goes about redistributing routes between routing protocols. I am only
> referring to routes between RIP-EIGRP-OSPF, etc. I want to see where
> the router gets it's information for redistribution and where it puts
> it's information once it has it.
>
>
>
> Also, is there a RIB for statics and connected routes?
>
>
>
> Thanks,
>
> Stephen
>
>
>
> ________________________________
>
> From: Sayeed Kachroo [mailto:sayeedk@hotmail.com]
> Sent: Saturday, July 23, 2005 7:19 PM
> To: gustavo.novais@novabase.pt; Stephen Hull; ccielab@groupstudy.com
> Subject: RE: Redistribution and RIBs
>
>
>
>
>
>
>
> When you use Redistribution on the border router between the two
> routers, it depends how are you redistributing. I mean routing
protools
> from one to another or redistribute static or redistribute connected,
in
> all cases i am going to looking in to my routing table to see what
route
> match your redistribution command. When you do redistribute connected,
> it will redistribute all your connected routes, but make sure the link
> between the two routers is the same routing protocol, otherwise
routing
> updates will not go over that interface.
>
>
>
> HTH
>
> SK
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> >From: "Gustavo Novais" <gustavo.novais@novabase.pt>
> >Reply-To: "Gustavo Novais" <gustavo.novais@novabase.pt>
> >To: "Stephen Hull" <shull@getsouthern.com>, <ccielab@groupstudy.com>
> >Subject: RE: Redistribution and RIBs
> >Date: Sun, 24 Jul 2005 00:45:24 +0100
> >
> >Hello,
> >
> >Your question is one I've been also debating since I've started my
prep
> >for CCIE. I'm not trying to be accurate or mislead you in no way. I'm
> >only telling you what I've learned.
> > For what I've understood, when you redistribute between two routing
> >protocols the router goes to the Routing table and see which routes
are
> >present in it for each routing protocol. Besides that it also checks
> the
> >RIBs of each protocol to see what routes belonging to which protocol
> are
> >directly connected (those belonging to a network statement). If you
> >notice, connected routes are present on the routing table as
connected,
> >nevertheless they are redistributed. (I think ISIS is a bit tricky on
> >that, you have to redist connected, correct me if I'm wrong, please,
> I'm
> >always learning).
> >
> >One thing you must be aware, I've noticed it throughout my
practicing,
> >is that if you do redist connected but filter which routes are
> >redistributed, the denied routes, even if they are under a network
> >statement, are not redistributed.
> >
> >I think my explanation is what I've come to understand of my study,
and
> >one of the big guys (Michael Jordan type :)) should be able, at least
> to
> >point, you on the right direction. My advise is try it for your self,
> >and learn it the hard way... You may read about it often, but you
won't
> >remember it unless you try it... (just like some other things in
life!)
> >
> >HTH
> >
> >Gustavo
> >
> >PS. Please correct me if I'm wrong or innacurate in any aspect
> >
> >
> >-----Original Message-----
> >From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> >Stephen Hull
> >Sent: domingo, 24 de Julho de 2005 0:12
> >To: ccielab@groupstudy.com
> >Subject: Redistribution and RIBs
> >
> >I have a question about redistribution. I would like to know exactly
> >what happens on the router when you redistribute between routing
> >protocols. Specifically, does the redistribution command use the
> >routing table for redistribution or does it look directly at the RIBs
> >for each routing protocol and use those to redistribute directly
> between
> >them? I am just trying to get a good handle on where and what the
> >commands are actually doing.
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > Thanks,
> >
> >
> >
> >Stephen
> >
>
>_______________________________________________________________________
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> >
>
>_______________________________________________________________________
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>
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