[rbak-nsp] IS-IS P2P interfaces

[Mariano Juliá]

2009/10/27 Ian Calderbank <ian at calderbankconsulting.co.uk>

> don't use ISIS :-)
> seriously, this is the only way to do it, there is no way to change
> interface type without delete and recreate.
>

I was hoping for a hidden IS-IS knob :-(

if you do it all in one go and get it right first commit , you may not get
> much of an outage (I assume its a live interface is why you're wary of
> deleting) but you're bound to drop something.
>

We had very bad experiences deleting/adding interfaces on a single commit
transaction, so much, that we now do it in two commits as standard practice.
The interfaces I have to change are around 50-60, with LDP, BFD, OSPF which
is why I cannot understand how IS-IS p2p was implemented this way.


> I'd do it in a network maintenance window.
>

It will be a looong and painful one, I hope Ericsson comes out with another
solution for future releases

Thanks,
Mariano


> cheers
> Ian
>
>  ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Mon, 26 Oct 2009 16:41:37 +0000
>> From: Mariano Juli? <mjuliaq at gmail.com>
>>
>> To: redback-nsp at puck.nether.net
>> Subject: [rbak-nsp] IS-IS P2P interfaces
>> Message-ID:
>> <49c8ec960910260941y1c67fa6ga64ad0b2684bda3b at mail.gmail.com>
>> Content-Type: text/plain; charset="iso-8859-1"
>>
>>
>> Hi everyone,
>>
>> I'm trying to configure all my IS-IS interfaces as p2p links in order to
>> avoid an ugly bug with non-p2p ISIS links on our target upgrade release
>> (6.1.3.7)
>>
>> There seems to be no command like "network point-to-point" and the
>> documentation shows this example for p2p;
>>
>> [local]Redback(config)#context local
>> [local]Redback(config-ctx)#interface lo0 loopback
>> [local]Redback(config-if)#ip address 10.1.1.1/32
>>
>> [local]Redback(config-ctx)#interface to-core2 p2p
>> [local]Redback(config-if)#ip unnumbered lo0
>>
>> [local]Redback(config-ctx)#router isis my-backbone
>> [local]Redback(config-isis)#net 47.0001.1111.2222.3333.00
>> [local]Redback(config-isis)#interface to-core2
>>
>> The config implies that the ip interface itself needs to be declared as
>> p2p,
>> which means that if the interface already exits it has to be removed
>> first.
>>
>> I'm hoping there is another to declare IS-IS interfaces as p2p without
>> having to erase them.
>>
>> How do others here manage this situation?
>>
>> Regards,
>>
>> Mariano
>>
>>
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