From: Reed, John (John.D.Reed@xxxxxxxxxx)
Date: Fri Dec 03 1999 - 16:05:05 GMT-3
I would be very careful about how I designed the Class "C" (/24) networks in
RIP, and ensure that they were close (if not contiguous) with the "Class B"
/22 network in OSPF. You can enter several summary-address commands into
OSPF to gather them together. To summarize a supernet of 52.40.28.0 /22 use
four /24 networks (.28,.29,.30, & .31).
For instance, in the sample lab I am working with, all of my addresses are
limited to 172.17.59.x. I have an OSPF into IGRP network, where the OSPF
VLSM are all over the map, and my IGRP link is /26 bit. So, I had to break
the address space into four /26 (64 node) sections. One section (.0) went
to the IGRP network, and the other three were spread through my OSPF ASs.
This is my OSPF configuration and route maps.
router ospf 210
summary-address 172.17.59.64 255.255.255.192
summary-address 172.17.59.128 255.255.255.192
summary-address 172.17.59.192 255.255.255.192
redistribute igrp 10 subnets route-map intoOSPF
network 172.17.59.80 0.0.0.15 area 0
network 172.17.59.64 0.0.0.15 area 2
network 172.17.59.225 0.0.0.0 area 0
area 0 authentication message-digest
area 2 authentication message-digest
area 2 virtual-link 172.17.59.226
route-map intoIGRP permit 10
match ip address 50
set metric 10000 1000 255 1 1500
!
route-map intoOSPF permit 10
match ip address 40
set metric-type type-1
no ip classless
access-list 14 permit 150.100.0.0
access-list 14 deny any
!
access-list 40 permit 10.0.0.0 0.255.255.255
access-list 40 permit 42.0.0.0 0.255.255.255
access-list 40 deny any
!
access-list 50 deny 10.0.0.0 0.255.255.255
access-list 50 deny 42.0.0.0 0.255.255.255
access-list 50 permit any
-----Original Message-----
From: rodrigo.kazuo@equant.com [mailto:rodrigo.kazuo@equant.com]
Sent: Friday, December 03, 1999 1:58 PM
To: ccielab@groupstudy.com
Subject: Re: Redistribution how ?
If you are using a class B network range, how have you configured a
24-bit
mask in RIP network (as it is a classfull protocol)? For the problem of
redistributing a subnet with mask 22 in an RIP network that is using 24-bit
mask, the only solution I have in mind is to announce and default-network.
In
this case, the router must have the command ip classless to use this default
net....
Tks and rgds...
anil kandare <akkandare@yahoo.com> on 12/03/99 01:36:04 PM
Please respond to anil kandare <akkandare@yahoo.com>
To: ccielab@groupstudy.com
cc: (bcc: Rodrigo Kazuo/Brazil/AMERICAS/Equant)
Subject: Redistribution how ?
Cisco gurus,
I have one classless (OSPF) and classful
(RIP) domains. Rip is configured with 24 bit mask.
OSPF areas with 24,28,26,30 and 22 bit masks. To
redistribute from OSPF TO RIP 28,26,30 bits mask areas
needs to summarise to 24 bit mask. But How do we
redistribute 22bit mask ospf area to RIP ?
RIP and ospf using same major class B
network.
Thanks in advance
Anil
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