Is it good practice to use same router id for bird and bird6 ?

[Jonathan Stewart]

On Fri, Mar 20, 2015 at 3:23 AM, olivier a <oatech7402 at gmail.com> wrote:

> let's 192.168.1.1 is my router Wan IP. One single physical router running
> bird and bird6.
>
> Solution 1 :
> bird router id = 192.168.1.1
> bird6 router id = 192.168.1.1
>
Solution 1 is better.

On my networks, i assign a globally unique IPv4 address (with a /32 mask)
to each router. This IP address is configured on the loopback interface,
and used as router-id for all the routing protocols it's running.

I can use this IP address to ping the router, SSH to the router, and as a
unique identifier when looking at routing tables, to find the origin of the
route, or where the route was learned from.

I don't use a WAN IP address for this purpose, because IP addresses
assigned to interfaces can change over time--and i don't want to change my
router ID.

Router ID is a 32-bit number, which needs to be unique, so using an IPv4
address assigned to my AS matches these requirements exactly.

Hope that helps.

Jonathan

> Solution 2 :
> bird router id = 192.168.1.1
> bird6 router id = 127.0.0.1
>
> Is that what you're advising ?
> What are the benefits of using IPv4 loopback as bird6 router id ??!
> :-)
> On Mar 19, 2015 11:13 AM, "Job Snijders" <job at instituut.net> wrote:
>
>> On Thu, Mar 19, 2015 at 11:08:06AM +0100, Ondrej Zajicek wrote:
>> > On Thu, Mar 19, 2015 at 09:35:42AM +0100, olivier a wrote:
>> > > Is it good practice to use same router id for bird and bird6 ?
>> > >
>> > > I'm wondering if there are some drawbacks or pitfalls ?
>> >
>> > I see no reason why not to use the same router id.
>>
>> I second that. If they are the same physical box, using the IPv4
>> loopback as router-id in bird6 is a good (and common) approach.
>>
>> Kind regards,
>>
>> Job
>>
>


-- 
     Jonathan
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