From: Bhisham Bajaj (bhishambajaj@xxxxxxxxx)
Date: Sun Jan 06 2002 - 01:24:24 GMT-3
how would NSSA help me into redistribute into IGRP
the point is that IGRP interface is on the same major
network but wih a diffrent mask and so want advertise
the OSPF networks on the interface
what has NSSA got to do with this
bh1sham
--- Wayne Lewis <lewisway@hcc.hawaii.edu> wrote:
>
> Brisham,
>
> NSSA is better here for area 2.
>
> Thanks,
>
> Wayne
>
>
> -----Original Message-----
> From: nobody@groupstudy.com
> [mailto:nobody@groupstudy.com]On Behalf Of
> Bhisham Bajaj
> Sent: Saturday, January 05, 2002 5:52 PM
> To: ccielab@groupstudy.com
> Subject: ALL about OSPF to IGRP redistribution
>
>
> There are 5 routers
>
>
>
>
>
R1----------R2-----------R3----------R4------------R5
>
> Area 1 Aear 0 Area 2 IGRP
>
>
>
> R2 is the ABR for Area 1, there are 8 networks in
> Area
> 1
>
> 142.1.32.0/24 00100 000
> 142.1.33.0/24 00100 001
> 142.1.34.0/24 00100 010
> 142.1.35.0/24 00100 011
> 142.1.36.0/24 00100 100
> 142.1.37.0/24 00100 101
> 142.1.38.0/24 00100 110
> 142.1.39.0/24 00100 111
>
> We can summarize these networks into one network
> with
> the /21 mask
> And inject it into the ospf Area 0
> So on R2 we would use the command
>
> R2(config-router)# area 1 range 142.1.32.0
> 255.255.248.0
>
> So this will summarized route into Area o for
> networks
> 32 to 39
>
> Now we have network 40 to 47 in Area 0 & Area 2
>
> 142.1.40.0/24 00101 000
> 142.1.41.0/24 00101 001
> 142.1.42.0/24 00101 010
> 142.1.43.0/24 00101 011
> 142.1.44.0/24 00101 100
> 142.1.45.0/24 00101 101
> 142.1.46.0/24 00101 110
> 142.1.47.0/24 00101 111
>
>
> The R4 is a router in Area 2 and is the ASBR it has
> S0
> in OSPF netork and S1 into IGRP network
>
> OSPF s0 s1 IGRP
> ------------------------R4-------------------------
> 142.1.47.0/24 142.1.16.0/20
>
>
> The OSPF network is made up of 142.1.32.0 to
> 142.1.47.0 /24
> These routes have to be redistributed into IGRP
> witch
> has a net work 142.1.16.0/20
>
> The IGRP will not advertise a route with the same
> major network and different mask
>
> So we have to summarize all the ospf network into
> one
> /20 bit network
>
> 142.1.32.0/24 0010 0000
> 142.1.33.0/24 0010 0001
> 142.1.34.0/24 0010 0010
> 142.1.35.0/24 0010 0011
> 142.1.36.0/24 0010 0100
> 142.1.37.0/24 0010 0101
> 142.1.38.0/24 0010 0110
> 142.1.39.0/24 0010 0111
> 142.1.40.0/24 0010 1000
> 142.1.41.0/24 0010 1001
> 142.1.42.0/24 0010 1010
> 142.1.43.0/24 0010 1011
> 142.1.44.0/24 0010 1100
> 142.1.45.0/24 0010 1101
> 142.1.46.0/24 0010 1110
> 142.1.47.0/24 0010 1111
>
>
> we can summarize network 32 to 47 /24 into one
> network
>
> 142.1.32.0 /16
>
>
> ON the ASBR that I the router R4 we will have to use
> the
> summary-address command so that when OSPF
> redistributes route into IGRP
> it will advertise the neworks 32 to 47 /24 as 32/20
>
> R4(config-router)#summary-address 142.1.32.0
> 255.255.240.0
>
>
> Know that the 142.1.32.0/16 advertisement is of the
> same mask that is used by IGRP
> The S1 interface that is in the 142.1.16.0/20
> network
> will
> Advertise the network 142.1.32.0/16 to router R5
> And R5 will be able to reach all the OSPF network
> with
> one route in its routing table
>
>
>
>
> HTH
>
> Bhisham
>
>
>
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 10:56:17 GMT-3