From: Salau, Yemi (yemi.salau@siemens.com)
Date: Tue Jul 24 2007 - 05:48:05 ART
I assume what Jeff wants to know is if RIP routes (AD 220) are
redistributed into BGP while iBGP is still advertising them from another
peer.
Jeff should have given us a pictorial view of his scenerio, one can
spend about 5 mins trying to comprehend his analogy. But from what I
understand, as long as a route doesn't appear within RIB, then it
wouldn't participate in redistribution process. So while iBGP is
advertising this Prefix X, as far as the "middle" router is concern,
it's not receiving the Prefix X from RIP at this point, so there is
nothing to redistribute into BGP.
However, like other guys commented, if iBGP fails to advertise the route
due to one reason or the other, then RIP takes over, Prefix X appears
within it's RIB and in turn gets redistributed into BGP.
To me, I wouldn't prefer BGP path over IGP anyway, if I connect to my
ISP via BGP and ofcourse knowing they charge lumps for using them as
gateways, why should I be paying these lots when I have a Backdoor (IGP)
route to same destination? As in why would I prefer the BGP to IGP?
Many Thanks
Yemi Salau
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
subodh.rawat@wipro.com
Sent: Tuesday, July 24, 2007 7:55 AM
To: jkoh.tt@hotmail.com; ccielab@groupstudy.com
Subject: RE: Question on Redistribution RIPv2 to BGP
After changing RIP AD, it will not appear as it has higer AD. However,
if iBGP advertised route is no more valid then RIP will kick in
automatically and will appear in GRT.
Cheers
Subodh
________________________________
From: Jeff Koh [mailto:jkoh.tt@hotmail.com]
Sent: Tuesday, July 24, 2007 12:17 PM
To: Subodh Singh Rawat (WT01 - TELECOM SERVICE PROVIDER);
ccielab@groupstudy.com
Subject: RE: Question on Redistribution RIPv2 to BGP
Hi,
What i would want to find out is that, given RIP and BGP running on the
same router. We change the default RIP AD to 220. So for instant, prefix
Y is learnt from RIP and suppose to be redistributed into BGP, BUT this
prefix Y is also been advertised by other BGP AS, so after changing the
RIP AD, the router with prefix Y - one coming from BGP (for this case
this router is peering with another IBGP router and that IBGP router
learnt this prefix Y from external BGP), one coming thru redistribution
via RIP. But after we changed the RIP AD, does this redistribution from
RIP to BGP still appear?
cheers,
________________________________
> Subject: RE: Question on Redistribution RIPv2 to BGP
> Date: Tue, 24 Jul 2007 07:36:49 +0100
> From: subodh.rawat@wipro.com
> To: jkoh.tt@hotmail.com; ccielab@groupstudy.com
>
>
> Your question is little vague. But what I have understood from you is
> that you want to know what will happen in case iBGP routes fail.....In
> that case RIP route will publish in the global routing table after
some
> time after iBGP fails and all dead time/hold time timer calculations.
>
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Jeff Koh
> Sent: Tuesday, July 24, 2007 11:36 AM
> To: ccielab@groupstudy.com
> Subject: Question on Redistribution RIPv2 to BGP
>
> Hi GS folks,
>
> This might not be related to the exam. Here's the scenario, we have
> segment Y redistributed from RIPv2 to BGP. This segment Y is also
being
> advertised by the external BGP via another AS. We increased the RIP AD
> to 220 to make IBGP the prefer. Thus in the event that IBGP fails, it
> will take RIP path. Now on the local router, since IBGP routes with AD
> 200 as the prefer, RIP will disappear from the routing table rite?
Then,
> what will happen to the RIP redistribution to BGP? Since only routes
> that appear on routing table will then be redistributed?
>
> Thanks!
>
> cheers,
>
> _________________________________________________________________
> Did you know you can import your contact list from Microsoft. Office.
> Outlook.
> or Outlook Express to Windows Live Hotmail?
> http://get.live.com/mail/features
>
>
This archive was generated by hypermail 2.1.4 : Sat Aug 18 2007 - 08:17:41 ART