From: David Fahed (dfahed@xxxxxx)
Date: Wed Feb 14 2001 - 03:20:15 GMT-3
Hi,
You summarize 170.10.7.0/24 from area 0. You'll see this summarie on other
router that don't belong to area 0 (be careful with router with virtual link,
they belong to area 0).
Hope this help!!!
Le mer, 14 fév 2001, Ilya Mazhara a écrit :
> Hi all!
>
> I'm plaing with Fatkid 501 Lab (expert redistribution) but my point of
> misundestanding at
> OSPF backbone network summarization process.
> Well see the pic:
> Lo0(area3)/170.10.5---R4--area2/170.10.128/26---R5---FR-ptm/area
> 0/170.10.7/28--..FR spokes
>
> R4 is ABR/ASBR with RIP/IGRP/OSPF mutual redistribution.
> R5 is backbone ABR, which should make summarization of 170.10.7/24.
>
> On the router R5:
> !
> interface Ethernet0/0
> ip address 170.10.128.1 255.255.255.192
> half-duplex
> !
> interface Serial0/0
> bandwidth 125
> ip address 170.10.7.1 255.255.255.240
> ip directed-broadcast
> encapsulation frame-relay
> ip ospf network point-to-multipoint
> no ip mroute-cache
> no fair-queue
> !
> router ospf 1
> router-id 170.10.9.1
> log-adjacency-changes
> area 0 range 170.10.7.0 255.255.255.0 cost 5 (!!!)
> area 2 range 170.10.128.0 255.255.255.0
> area 2 virtual-link 170.10.5.1
> network 170.10.7.0 0.0.0.255 area 0
> network 170.10.9.0 0.0.0.255 area 2
> network 170.10.128.0 0.0.0.63 area 2
>
> There're net 170.10.7/24 summaries at OSPF database:
> Router5#sh ip osp da sum 170.10.7.0
> OSPF Router with ID (170.10.9.1) (Process ID 1)
> Summary Net Link States (Area 2)
> LS age: 1485
> Options: (No TOS-capability, DC, Upward)
> LS Type: Summary Links(Network)
> Link State ID: 170.10.7.0 (summary Network Number)
> Advertising Router: 170.10.9.1 (! itself loopback)
> LS Seq Number: 80000023
> Checksum: 0x712A
> Length: 28
> Network Mask: /24
> TOS: 0 Metric: 5
>
> But its cannot be injected in routing table:
> On R5 : C 170.10.7.0/28 is directly connected, Serial0/0
> And on other routers, for example, R4 only more specific routes:
> O 170.10.7.1/32 [110/10] via 170.10.128.1, 00:08:47, Ethernet0/0
> O 170.10.7.0/28 [110/2372] via 170.10.128.1, 00:08:47, Ethernet0/0
> O 170.10.9.0/24 [110/11] via 170.10.128.1, 00:08:47, Ethernet0/0
> Advice?
>
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