From: Ramesh Ramasamy (ramesh_ramasamy@xxxxxxxxxxx)
Date: Sun Apr 08 2001 - 12:29:42 GMT-3
Nigel,
You nailed it. sorry about delayed reply. got stuck in regular work
load...
Yes - the prob was due to split horizon - i had my scenario with frame...and
due to lack of some hw did a physical i/f. This is why
i was using the distance 120 command to avoid looping. However didnt
realise what was going on for a loooong time.... even with debug outputs
my mind was going blank....
Second one was too confusing to respond. I messed with configs so much
immediately after - i dont know it anymore!
NC-5th may - well i stay at wingate inn at page road - pretty close to the
lab - about 5/8 mins drive - internet connection.... and also a quiet
atmosphere...can look out into the woods if you happen to be on the rear
side... and try to focus..!!!
Thanks,
Ramesh.
>From: "Nigel Taylor" <nigel_taylor@hotmail.com>
>Reply-To: "Nigel Taylor" <nigel_taylor@hotmail.com>
>To: "Ramesh Ramasamy" <ramesh_ramasamy@hotmail.com>,
><ccielab@groupstudy.com>
>Subject: Re: ospf-igrp-2 redis-doubts
>Date: Wed, 4 Apr 2001 03:40:36 -0400
>
>Ramesh,
> Let's see if I'm also getting confused as I get closer as
>well.. See Inline.
>----- Original Message -----
>From: Ramesh Ramasamy <ramesh_ramasamy@hotmail.com>
>To: <ccielab@groupstudy.com>
>Sent: Wednesday, April 04, 2001 2:45 AM
>Subject: ospf-igrp-2 redis-doubts
>
>
> > Hi All,
> > As am getting closer to the lab - am getting more confused I think.
>Need
> > your help with these doubts pls.....
> > Thanks,
> > RR.
> >
> > Redistribution Question--1
> > IS THIS POSSIBLE?:
> > ---------------------------
> > scenario: ospf backbone - asbr with area0 and 1 with igrp.
> > task : do mutual redistribution and send a def.router to igrp only rtr.
> > Assumptions - the regular ones .........no static routes...etc.,
> > ... AND--you dont have a (non-ospf) classful subnet - on your network.
> > 1.You have to send default route into igrp from an ASBR to a
> > remote router only running IGRP.
> > 2.Redistributing router is having area 0 and area x and igrp.
> > I tried using the following on the asbr:
> > acl 1 permit 0.0.0.0 -- and then a
> > distribute list out 1 serial 0 -- connecting the remote igrp rtr.
> > I didnt see the default route on the igrp router.
> > CAN SOMEONE CONFIRM THAT THIS WILL / WILL NOT WORK FOR IGRP? PLS
> > my reasoning:
> > -------------
> > igrp - so no default-info originate;
> > choice of ip default network - is not there since there is no classful
> > subnets (non-ospf) anywhere in the scenario
>
>NT: Good points..! Once we agree that igrp doesn't know how to interpret
>0.0.0.0, then we agree
>that a redistributed default-route won't work either. based on the points
>you've already identified I
>would say that the only options left here is summarization of the ospf
>domain to the classful boundary
>which igrp should learn.
>
> >
> > Redistribution Question--2:
>
>NT: Since igrp has a lower AD than ospf why even bother filtering what
>routes ospf gets from igrp. Also why the need for the "distance" command.
>This typically used in a scanerio with multiple point of redistribution to
>allow redundant route infomation to exist in the network.
>
>Depending on the specifics of the connection, using the ip split-horizion
>on
>the interface connecting the
>igrp router should eliminate any possible routing loops. Also, what is the
>exact (E2) route being picked up
>by ospf...?
>
> > ---------------------------
> > Same scenario - if you are given a non-ospf classful network and
> > do a 'ip default network a.b.c.0' - i got the default route as
> > i wanted. But I had a distribute-list to filter the igrp learnt
> > routes to be permited to go to ospf. And THIS stopped the
> > 154.14.0.0 - E2 routes from appearing in the ospf routers...??WHY?
> > !
> > router ospf 1
> > redistribute connected metric 1 subnets route-map looponly
> > redistribute igrp 1 metric 150 subnets
> > passive-interface Serial0
> > network 145.2.28.0 0.0.3.255 area 0
> > network 145.2.32.0 0.0.0.3 area 5
> > distribute-list 34 out igrp 1<---got out of this by removing this.
> > !
> > router igrp 1
> > redistribute ospf 1
> > passive-interface BRI0
> > passive-interface Ethernet0
> > passive-interface Loopback0
> > network 145.2.0.0
> > default-metric 8000 100 255 1 1500
> > distance 120
> > !
> > ip classless
> > ip default-network a.b.c.0
> > access-list 10 permit 145.2.3.0 0.0.0.255
> > access-list 10 permit 145.2.192.0 0.0.0.255
> > access-list 34 permit 145.2.4.0 0.0.0.255
> > access-list 34 permit 154.14.0.0 0.0.0.255
> > Pls correct if am wrong in this:
> > classful-Class B -igrp - with vlsm subnets inside their domain -
> > when connected through /24 ip add to a classless - ospf - is sending
> > only /16 of the Class B network through IGRP adhering to its nature.
> > When this /16 needs to be sent back to rest of network - as long as
> > we dont have overlaps of the same network AND we have specific routes
> > to other /24 /xx of the same Class B network - we should not have
> > reachability problems - provided our configs are fine!
> > Your feedback is appreciated.
>
>NT: sounds good to me.....:-)
>
>
> >
> > Thanks,
> > RR.
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