From: Arne Kuhlmann (ccie-lab@xxxxxxx)
Date: Sun Aug 06 2000 - 18:54:11 GMT-3
Philip,
if you are using RIP1 which is a classfull routing protocol with classless
addresses (i.e. 172.17.x.x. with a /24 mask) the subnet mask of the summary has
to match the mask of the interface it is being advertised out.
So even if you create a static route on R2
ip route 172.17.0.0 255.255.0.0 null0
and do a "redistribute static" in RIP it still won't be advertised.
Change your route to
ip route 172.17.95.0 255.255.255.0 null0
and it will be advertised.
If you have more than one OSPF area you could do a
area X range 172.17.95.0 255.255.255.0
on the ABR and you'll have a summary in your OSPF table. Again, it needs to hav
e
the right subnet mask it be redistributed into RIP1.
Alternatively you could use RIP2....
Arne
Philip lai wrote:
>
> ospf rip redistribution
>
> R3--Fr--R2--|--R7
> ospf rip
>
> R3 s0.1 172.17.95.1/30
> R2 s0.1 172.17.95.2/30
> R2 lo 172.17.2.2/24
> R2 e0 172.17.10.240/24
> R7 eo 172.17.10.241/24
>
> I was trying to redistribute ospf into rip. Since the mask on R2 e0 is
> 24 bit,
> I would like to summarize it before sending into rip.
>
> In R2, I use summary address on ospf.
>
> router ospf 1
> summary-address 172.17.0.0 255.255.0.0
> network 172.17.95.2 0.0.0.0 area 64
> network 172.17.2.2 0.0.0.0 area 64
> !
> router rip
> redistribute ospf 1
> passive-interface Serial0.1
> network 172.17.0.0
> default-metric 1
>
> r2#sh ip route
> Gateway of last resort is not set
>
> 172.17.0.0/16 is variably subnetted, 5 subnets, 3 masks
> C 172.17.10.0/24 is directly connected, Ethernet0
> O 172.17.0.0/16 is a summary, 00:09:47, Null0
> C 172.17.2.0/24 is directly connected, Loopback0
> C 172.17.95.0/30 is directly connected, Serial0.1
> O 172.17.95.4/30 [110/128] via 172.17.95.1, 00:03:25, Serial0.1
>
> That was great. A summary address 172.17.0.0/16 was appear. However,
> when I
> look at routing table of R7. This route do not come out.
>
> r7#sh ip route
> C
> Gateway of last resort is not set
>
> 172.17.0.0/24 is subnetted, 2 subnets
> C 172.17.10.0 is directly connected, Ethernet0/0
> R 172.17.2.0 [120/1] via 172.17.10.240, 00:00:09, Ethernet0/0
>
> When I try debug ip rip at R2, only 172.17.2.0 are send to R7.
> Anybody know what is wrong with the config ? If I need to send a summary
> route
> to R7. Is that any other way to do it ? Any suggestion are appreciated.
>
> Rdgs,
> Philip
>
> r2(config-if)#
> 00:14:27: RIP: sending v1 update to 255.255.255.255 via Loopback0
> (172.17.2.2) -
> suppressing null update
> 00:14:28: RIP: sending v1 update to 255.255.255.255 via Ethernet0
> (172.17.10.240)
> 00:14:28: subnet 172.17.2.0, metric 1
> 00:14:28: RIP: sending v1 update to 255.255.255.255 via Loopback0
> (172.17.2.2)
> 00:14:28: subnet 172.17.10.0, metric 1
>
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