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forward address - router ID

 

 

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hattab at ies

Apr 12, 2012, 4:05 AM

Post #1 of 2 (539 views)
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forward address - router ID

Dear all,

*Checked OSPF Database, and found something interesting. The external
OSPF routes (NSSA type-7) is advertised by the DNS servers with
forwarding address of the physical interface instead of router ID. Now,
Since the interface is down, the next hop IP ( which is the forwarding
address) is not valid and hence all traffic destined to this VIP will be
black hole.*

*Your support is appreciated.*

*Regards,

Naser Al Hattab.

***


hannah at tinfoilhat

Apr 12, 2012, 4:52 AM

Post #2 of 2 (427 views)
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Re: forward address - router ID [In reply to]

On 12/04/2012, at 21:05, Naser Al Hattab <hattab [at] ies> wrote:

> Dear all,
>
> Checked OSPF Database, and found something interesting. The external OSPF routes (NSSA type-7) is advertised by the DNS servers with forwarding address of the physical interface instead of router ID. Now, Since the interface is down, the next hop IP ( which is the forwarding address) is not valid and hence all traffic destined to this VIP will be black hole
>

The router ID is only used for identification purposes, and doesn't have to even be an address on the system.

Surely though if the interface is down, it wouldn't be able to announce link states to neighbours on that interface?

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