[c-nsp] IP unnumbered vlan subinterfaces question

[Rodney Dunn]

Don't do it. It's a hack and there are other forwarding plane things 
that don't like it. Read as..it may or may not always work.

Burn another /32 for your loopback.

Rodney



Aaron wrote:
> Loopback interfaces do not go down, so I'm not sure what benefit you are
> getting besides the ability to blackhole the 10.10.10.0/24 if the ethernet
> goes down.
> 
> On Mon, Aug 3, 2009 at 11:09, Michael Ulitskiy <mulitskiy at acedsl.com> wrote:
> 
>> Hello,
>>
>> Guys, are there any drawbacks of doing the following:
>>
>> interface Lo0
>>  ip address 10.10.10.1 255.255.255.0
>> !
>> interface FastEthernet0/0.1
>>  encapsulation dot1q 1 native
>>  ip unnumbered Lo0
>> !
>> ip route 10.10.10.0 255.255.255.0 FastEthernet0/0.1
>> !
>>
>> as opposed to having ip address configured directly on the interface as
>> usual?
>> I need that ip address to stay always up regardless of Fa0/0 state, 'cause
>> it's used for other services that should stay up
>> and I'd prefer to avoid assigning another ip address exclusively for
>> loopback use.
>> It seems to work in my lab, but I thought I'd better ask...
>>
>> Thanks,
>> Michael
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