RE: distribute-list ( Nth time)

From: RSiddappa@xxxxxxxxxx
Date: Mon Feb 18 2002 - 21:16:43 GMT-3

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If u want to criticize what I am trying ask or do, then sorry and thanks for
u r help and sorry to bother u and waste u r time.

The point here is when I am filtering on the interface it will never come in
to the routing protocol and hence everything will be ok.

When u us the distribute list like distribute-list 1 out igrp

The route will first come in to the routing table before getting out and
getting filterd by OSPF.

-----Original Message-----
From: fwells12 [mailto:fwells12@hotmail.com]
Sent: Monday, February 18, 2002 6:06 PM
To: Siddappa, Rajeev
Subject: Re: distribute-list ( Nth time)

They work just fine. You just need to think about where they are filtering
routes. There is a big difference between filtering them into another
routing process and not advertising them over a particular interface.

Setup as many different filtering scenarios you can think of and take notes
to the way they work. Be sure that issues like split-horizon and other
route filters are not producing incorrect routing information. You will be
surprised how the various routing protocols both differ and use a similar
approach.

This is absolutely fundamental knowledge to being prepared for the lab.

Good luck.

----- Original Message -----
From: RSiddappa@NECBNS.com <mailto:RSiddappa@NECBNS.com>
To: fwells12@hotmail.com <mailto:fwells12@hotmail.com>
Sent: Monday, February 18, 2002 4:02 PM
Subject: RE: distribute-list ( Nth time)

This config was done on the router running both the protocols.

I aging agree for u r SPLIT--HORIZON problem.

But, the why does this distribute-list works and not the other.

-----Original Message-----
From: fwells12 [mailto:fwells12@hotmail.com]
Sent: Monday, February 18, 2002 5:57 PM
To: Siddappa, Rajeev
Subject: Re: distribute-list ( Nth time)

This config now blocks the IGRP route from being learned via the interface
it was sent out on. Again, this shows us that split-horizon is your
problem.

I absolutely understand and agree what u say.

I will tell u if I put an access-list and an distribute list under IGRP as
follows

access-list 1 permit 172.168.200.0 0.0.0.255

access-list 1 permit 172.168.40.0 0.0.0.255

router IGRP 5
distribute-list 1 in serial 02.

This will work fins with out disabling the split horizon.

So there is some problem in this command that is for sure.
R.

-----Original Message-----
From: fwells12 [mailto:fwells12@hotmail.com]
Sent: Monday, February 18, 2002 5:48 PM
To: Siddappa, Rajeev
Subject: Re: distribute-list ( Nth time)

The 172.168.30.0 net is an OSPF network. It gets learned it and distributes
it into IGRP. IGRP learn it and because split-horizon is not configured
correctly advertises it back out the same interface it learned it on.
IGRP has a lower AD that OSPF thus the router uses the IGRP route in its
RIB.

You are wondering why the distribute list does not filter it from being
readvertised into OSPF. I cannot give you the technical reason as to why
this happens, I can only assume that the split-horizon issue causes it to
work that way.

Fix the split-horizon issue then see if you still have a problem. I suspect
not.

How do u say that

-----Original Message-----
From: fwells12 [mailto:fwells12@hotmail.com]
Sent: Monday, February 18, 2002 5:35 PM
To: Siddappa, Rajeev
Subject: Re: distribute-list ( Nth time)

Your distribute list appears to be working fine.

I knwo that, but why u r distribute-list is not working.

I am trying to solve the problem with out bothering about split horizon. I
was able to do it using differnt distribute-list command and one more method
using distance command.

If want to tlak I can call u, pls mail me u rnumber.

214-929-1601

-----Original Message-----
From: fwells12 [mailto:fwells12@hotmail.com]
Sent: Monday, February 18, 2002 5:27 PM
To: Siddappa, Rajeev
Subject: Re: distribute-list ( Nth time)

You have a split-horizon problem.

TELL ME WHAT DO U SAY ABOUT THIS.

!
interface Serial0.1 multipoint ( Interface running OSPF)
ip address 172.168.100.5 255.255.255.0
no ip directed-broadcast
ip ospf network point-to-multipoint
frame-relay interface-dlci 501
frame-relay interface-dlci 506
!
interface Serial0.2 point-to-point ( Interface runnign IGRP)
ip address 172.168.200.1 255.255.255.0
no ip directed-broadcast
frame-relay interface-dlci 504
!
interface Serial1
ip address 137.20.20.10 255.255.255.0
no ip directed-broadcast
ip ospf cost 1

router ospf 5
area 10 virtual-link 172.168.30.97
redistribute igrp 5 metric-type 1 subnets
network 172.168.100.0 0.0.0.255 area 10
distribute-list 2 out igrp 5
!
router igrp 5
redistribute ospf 5 metric 10000 100 255 1 1500
network 172.168.0.0
!
ip classless
!
access-list 2 permit 172.168.200.0 0.0.0.255
access-list 2 permit 172.168.40.0 0.0.0.255
!
!

After clearing the OSPF process this what the uting table looks like and

Look for the route 172.168.30.0 network

R5#sh ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
       i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate
default
       U - per-user static route, o - ODR

Gateway of last resort is not set

     137.20.0.0/24 is subnetted, 1 subnets
C 137.20.20.0 is directly connected, Serial1
     172.168.0.0/16 is variably subnetted, 5 subnets, 2 masks
O IA 172.168.30.0/24 [110/74] via 172.168.100.3, 00:00:05, Serial0.1
I 172.168.40.0/24 [100/8576] via 172.168.200.2, 00:00:25, Serial0.2
C 172.168.100.0/24 is directly connected, Serial0.1
O 172.168.100.3/32 [110/64] via 172.168.100.3, 00:00:25, Serial0.1
C 172.168.200.0/24 is directly connected, Serial0.2
     10.0.0.0/24 is subnetted, 1 subnets
C 10.10.10.0 is directly connected, TokenRing0

This is after some time.

Gateway of last resort is not set

     137.20.0.0/24 is subnetted, 1 subnets
C 137.20.20.0 is directly connected, Serial1
     172.168.0.0/16 is variably subnetted, 5 subnets, 2 masks
I 172.168.30.0/24 [100/10576] via 172.168.200.2, 00:00:02, Serial0.2
I 172.168.40.0/24 [100/8576] via 172.168.200.2, 00:00:02, Serial0.2
C 172.168.100.0/24 is directly connected, Serial0.1
O 172.168.100.3/32 [110/64] via 172.168.100.3, 00:00:28, Serial0.1
C 172.168.200.0/24 is directly connected, Serial0.2
     10.0.0.0/24 is subnetted, 1 subnets
C 10.10.10.0 is directly connected, TokenRing0
R5#sh ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
       i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate
default
       U - per-user static route, o - ODR

Gateway of last resort is not set

Next message: Bill Greenwood: "Re: Strange HSRP output?"
Previous message: RSiddappa@xxxxxxxxxx: "RE: Route-Reflectors & No-Sync"
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