Re: OSPF Default Route

From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Mon Jan 26 2009 - 13:38:57 ARST


It's a typo, it should read 1. Also, @Pavel, the E2 metric does matter
because it determines when to check the forward metric. If you
originate multiple E2 defaults all with the same cost, the forward
metrics will be compared, making the lookup similar to an E1 route.
You can see the forward metric through the "show ip route a.b.c.d"
output.

HTH,

Brian McGahan, CCIE #8593 (R&S/SP/Security)
bmcgahan@internetworkexpert.com

Internetwork Expert, Inc.
http://www.internetworkexpert.com

On Jan 26, 2009, at 6:53 AM, Nick <ccieaz@googlemail.com> wrote:

> Hi All
>
> Working through the IE Vol 1 Version 5 workbook I see this in the
> notes:
>
> "without additional arguments on the command the default route would
> have
> been advertised as a Type-2 External route with a metric of 20"
>
> I tested this out, but I see the metric as 1. Is 20 a mistake in the
> IE
> document or did I miss something?
>
> Rack1R6#show run | sec router ospf
> router ospf 1
> log-adjacency-changes
> network 0.0.0.0 255.255.255.255 area 0
> default-information originate always
>
> Rack1R4#show ip route ospf
> <...>
> O*E2 0.0.0.0/0 [110/1] via 155.1.146.6, 01:08:39, FastEthernet0/1
>
> Rack1R4#show ip ospf database external 0.0.0.0
>
> OSPF Router with ID (150.1.4.4) (Process ID 1)
>
> Type-5 AS External Link States
>
> Routing Bit Set on this LSA
> LS age: 344
> Options: (No TOS-capability, DC)
> LS Type: AS External Link
> Link State ID: 0.0.0.0 (External Network Number )
> Advertising Router: 150.1.6.6
> LS Seq Number: 80000003
> Checksum: 0x9577
> Length: 36
> Network Mask: /0
> Metric Type: 2 (Larger than any link state path)
> TOS: 0
> Metric: 1
> Forward Address: 0.0.0.0
> External Route Tag: 1
>
> --
> ---
>
> Thanks
>
> Nick
>
>
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