From: Louis Krucker (lkrucker@xxxxxxxxxxxxxx)
Date: Tue Mar 05 2002 - 14:28:52 GMT-3
Area Range: This command create a summary on ABRs into the ospf cloud
summary-address: this command you can use at ASBRs to create a summarized
network entry into the ospf cloud to keep the routing table
smaller.
default-network: works only if the default network is in another classfull
network and
this network must be configured local on the
router.Otherwise IOS create
a static route entry in your config and delete the def
ault-network
statement.
For those guys who think lets make a loopback, i try it out
but did not
help.-((
Keep in mind those commands create only summarys into ospf and not outside
into another
routing domain. If your hole network is addressed in the same classful major
network for
example 172.17.59.X, igrp sees only class B network 172.17.x.x/16. If your
link between
the igrp and the igrp/ospf router have a mask of /30 you will never receive
other
routing updates than /30.
So if you ask, how i can connect other networks e.g. /24, thats from my
point of
view not possible whitout static route, because igrp dont know masks and
VLSM.
May you try tunnel interfaces or secondary addresses, not possible due
overlapping
address ranges on the same router.
Thats my point of view but if somebody have a solution, plese tell me how!!!
regards
Louis
This question is answered in the archives (many times). To give you a
start - when you redistribute OSPF into IGRP the routes you will see on
the IGRP router are classful routes, routes having the same mask as the
IGRP-OSPF connected network, and host routes.
If you can summarize OSPF routes (area range) to a classful network, or
a network having the same mask as the IGRP-OSPF connection, these will
appear in the IGRP routing table. Other routes won't. The
default-network command is used to provide a default gateway to IGRP for
connectivity but will not put additional networks in the table.
Hope this helps you to get started.
Fred.
Babacar Diop wrote:
>
> When you mutually redistribute between OSPF and IGRP,
> and do not see all the subnetted OSPF routes in a
> router running IGRP only, what do you do to get the
> routes in that router (running IGRP). Also, how does
> the mask configured on the router running IGRP have
> anything to do with the redistribution.
> I know two things, that help not loose connectivity:
>
> 1) Use the summary address in OSPF to summarize the
> routes you want to see in the router running IGRP.
> 2) Annonce an IP default-network on the redistributing
> router pointing to the IGRP domain.
>
> This has never worked for me and am i supposed to see
> these routes in the router running IGRP after i use
> one of the above command?
> How does the lenght of the mask in interfaces
> configured for IGRP come into play?
> I am very confused.
> Does anybody has an better explanation or maybe a
> document i can read to better understand this issue.
>
> Regards,
>
> BD
>
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