From: Zack (Doc) (zack@tnan.net)
Date: Tue May 22 2007 - 12:10:42 ART
Just off the top of my head... Since R5 is the DR within the Ether
range, isn't it responsible for advertising routes into A0, so it's
doing that advertising, and R4 is simply seeing it in A45 because of
the neighbor, but not allowed to tell A0.
Also, A0 is showing the connection to R5 as a stub network. Perhaps
that's responsible for the advertisement.
On 5/22/07, Eric Poulin <epoulins@yahoo.com> wrote:
> Hi GS,
>
> I have two routers, R4 and R5, running OSPF between each other over Frame Relay (Area0)
> and also Ethernet (Area45). R5 is learning an inter-area route 150.1.6.6/32 from R4 over
> both links. The OSPF cost to reach R4 over the FR is 64 and Ethernet is 1. Please can
> someone explain me why R5 prefers the route over the frame Relay as opposed to the
> Ethernet? I was expecting R5 to chose its Ethernet link with a cumulative cost of 3
> instead of the FR interface with a cumulative cost of 66? Are routes for the same prefix
> preferred within Area0?
>
> Thanks for your help,
> Eric
>
> ----------------------------
> Rack1R5#sh ip ospf neighbor
> Neighbor ID Pri State Dead Time Address Interface
> 150.1.4.4 0 FULL/DROTHER 868 msec 183.1.0.4 Serial0/0
> 150.1.4.4 1 FULL/DR 00:01:46 183.1.45.4 FastEthernet0/1
> ----------------------------
> Rack1R5#sh ip route ospf
> 150.1.0.0/16 is variably subnetted, 9 subnets, 2 masks
> O IA 150.1.6.6/32 [110/66] via 183.1.0.4, 00:05:09, Serial0/0
> ----------------------------
> Rack1R5#sh ip ospf database summ 150.1.6.6
>
> OSPF Router with ID (150.1.5.5) (Process ID 1)
>
> Summary Net Link States (Area 0)
>
> Routing Bit Set on this LSA
> LS age: 1865
> Options: (No TOS-capability, DC, Upward)
> LS Type: Summary Links(Network)
> Link State ID: 150.1.6.6 (summary Network Number)
> Advertising Router: 150.1.4.4
> LS Seq Number: 80000012
> Checksum: 0xC323
> Length: 28
> Network Mask: /32
> TOS: 0 Metric: 2
>
>
> Summary Net Link States (Area 45)
>
> LS age: 1865
> Options: (No TOS-capability, DC, Upward)
> LS Type: Summary Links(Network)
> Link State ID: 150.1.6.6 (summary Network Number)
> Advertising Router: 150.1.4.4
> LS Seq Number: 80000012
> Checksum: 0xC323
> Length: 28
> Network Mask: /32
> TOS: 0 Metric: 2
> ----------------------------
> Rack1R5#sh ip ospf database router 150.1.4.4
>
> OSPF Router with ID (150.1.5.5) (Process ID 1)
>
> Router Link States (Area 0)
>
> Routing Bit Set on this LSA
> LS age: 186
> Options: (No TOS-capability, DC)
> LS Type: Router Links
> Link State ID: 150.1.4.4
> Advertising Router: 150.1.4.4
> LS Seq Number: 80000018
> Checksum: 0x8AE6
> Length: 48
> Area Border Router
> Number of Links: 2
>
> Link connected to: a Transit Network
> (Link ID) Designated Router address: 183.1.0.5
> (Link Data) Router Interface address: 183.1.0.4
> Number of TOS metrics: 0
> TOS 0 Metrics: 64
>
> Link connected to: a Stub Network
> (Link ID) Network/subnet number: 150.1.4.4
> (Link Data) Network Mask: 255.255.255.255
> Number of TOS metrics: 0
> TOS 0 Metrics: 1
>
>
>
> Router Link States (Area 45)
>
> Routing Bit Set on this LSA
> LS age: 576
> Options: (No TOS-capability, DC)
> LS Type: Router Links
> Link State ID: 150.1.4.4
> Advertising Router: 150.1.4.4
> LS Seq Number: 8000001C
> Checksum: 0x6C97
> Length: 36
> Area Border Router
> Number of Links: 1
>
> Link connected to: a Transit Network
> (Link ID) Designated Router address: 183.1.45.4
> (Link Data) Router Interface address: 183.1.45.4
> Number of TOS metrics: 0
> TOS 0 Metrics: 1
> ----------------------------
>
>
>
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