03-09-2004 12:19 AM - edited 03-02-2019 02:08 PM
hi,
i have a 3 layered model:
corerouter (7206) distributionrouter (3640) any access-router (1760).
the 7206 and the 3640 are running ospf in a way that the 3640 gives a summary-route to the 7206 - e.g 10.20.0.0/16.
the 3640 then has static routes to the access-router
10.20.2.0 / 24
10.20.3.0 /24
and so on.
so the 7206 has no knowledge of the /24 networks behind the 3640.
is there any possibility, that the 7206 gets the summary routes (10.20.0.0 /16) AND the /24 networks??
(redistribute static or so)
reason:
we want to implement isdn-backup for some access-router to the core.
but the 7206 only knows the summary-route 10.20.0.0/16 and if we configa floating static over isdn to the network 10.20.2.0/24, the 7206 takes the path over isdn of course because of best match regardless which admin-distance we use for floating static route.
any idea ????
thanks for answer !
03-09-2004 04:56 AM
Unlike BGP, OSPF doesn't allow you to advertise the summary and the more specific routes for that summary. One way to achieve what you want to do is to stop summarizing the /24s.
Hope this helps,
03-09-2004 05:14 AM
hi,
thanks for answer, but we have the solution:
it is possible to advertise both !!!
like this - with route-maps AND TAGs:
!
router ospf 65052
router-id 172.16.24.9
log-adjacency-changes
area 99 stub no-summary
area 99 range 10.22.216.0 255.255.248.0
redistribute connected
redistribute static subnets route-map isdn-backup
passive-interface default
no passive-interface Serial0/0.299
no passive-interface Serial0/0.699
network 10.22.216.0 0.0.7.255 area 99
network 172.16.24.9 0.0.0.0 area 0
network 172.16.25.28 0.0.0.3 area 0
network 172.16.25.128 0.0.0.3 area 0
network 172.16.26.9 0.0.0.0 area 0
!
route-map isdn-backup permit 10
match tag 99
set level backbone
!
ip route 10.22.216.1 255.255.255.255 Serial0/1 10.22.223.2 tag 99
ip route 10.22.217.0 255.255.255.0 Serial0/1 10.22.223.2 tag 99
ip route 10.23.122.0 255.255.255.192 Serial0/1 10.22.223.2 tag 99
so this 3 routes are advertised in the summary and
in these 3 routes too:
O IA 10.22.216.0/21 [110/1501] via 172.16.25.30, 01:49:59, Serial1/2.299
O E2 10.22.217.0/24 [110/20] via 172.16.25.30, 01:21:24, Serial1/2.299
O E2 10.22.216.1/32 [110/20] via 172.16.25.30, 01:21:24, Serial1/2.299
O E2 10.23.122.0/26 [110/20] via 172.16.25.30, 01:22:02, Serial1/2.299
If the link to this access-router fails, these 3 E2 routes are flushed from the table !!
03-09-2004 05:35 AM
My mistake, I thought you were summarizing using the summary-address command to filter the external routes.
03-09-2004 05:53 AM
no problem !
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