Hi, Mohamed.
This is just my humble opion in line.
On 29 Dec 2000 14:40:11 -0500, [EMAIL PROTECTED] (Mohamed Heeba)
wrote:
>i was trying the Fatkid 501 redistribution lab when i got this problem
>
>the lab is 5 routers , 3 of them (R1,R2,R3) are in area 0 over Frame relay
>with a subnet of 28 bit mask
>one of this routers ( R3) are connected to another router ( R4) forming area
>3 on the link between them , and another area on its loopback interface
>(area 2 )
A loopback interface in OSPF is treated a host route (a stub network)
unless it's configured as point-to-point network type explicitly. So I
believe area 2 is meaningless here.
>
>now R4 is connected to another router (R5) and the link between them is
>running IGRP with subnet of mask 24 .......i hope this is clear to you
First, you should NOT establish a virtual-link between R3 and R4
unless R4 is a ABR between area 3 and another non-backbone area(for
example, area 4) which is not directly connected to the backbone area.
A virtual-link is needed when the only way to the backbone area is
through another non-backbone area(a transit area). In this case R4 is
not a ABR if you don't configure some other interface as another
nonbackbone area , which you didn't mention it. But R4 can be a ASBR
if R4 is redistributing IGRP learned routes into that OSPF process
domain.
Second, IGRP is a CLASSFUL routing protocol. What it means is IGRP is
accepting subnet routes only if their subnet mask is the same as
configured on one of its local interfaces of the same major network.
In this case, subnet masks are different even if they are from same
major network. (major network means Class A, B, or C network here)
So, ospf subnets are not getting through to IGRP.
>
>the problem is
>i have formed a virtual link between R4 and R3 and things looked fine to me
>BUT when i redistribute the OSPF to the IGRP , the 28 bit subnet never
>appeared to R5
>i summarized the network , trying the AREA range command at R3 , then at R4
> i tried also the summary-address at R4....but the subnet never appeared in
>R5
summary-address command is needed when you are redistributing routes
from another source INTO its ospf process domain, which is not the
case in this situation.
I hope this will be of a little help to you.
Thanks
>although some other networks ( of 26 bit masks) appreared fine when i
>summarized them at 24 bit boundry
>can anyone knows where is the problem ??
>
>
>NOTE:when i configured the frame relay interfaces as point-to-mulitpoint ,
>only the 32 address appreared in the routing tables , when i changed the
>network type to broadcast type , the 28 bit subnet appeared ..but still it
>didnt go to the far IGRP router ...
>wat is the problem ????
>
>
>
>Mohamed HEEBA
>
>
>
>
>
>
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