From: Ronnie Angello (ronnie.angello@gmail.com)
Date: Tue May 22 2007 - 12:48:43 ART
The path through area 0 will be preferred.
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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-- Ronald Angello CCIE #17846
This archive was generated by hypermail 2.1.4 : Fri Jun 01 2007 - 06:55:21 ART