[nm-wg] Re: [I2G2-Proto] NMWG schema comments (mainly about IPv6 and multicast)

[Joe Metzger]

Dan Gunter wrote:

> 
>>
>> Dan,
>> It is not a caching issue.  It is that ifName & IP Address are not
>> sufficent to uniquely identify an interface in all cases.
>>
> OK, clearly I didn't understand this whole issue, sorry. What you're 
> saying is that you need N additional identifiers in addition to IP and 
> interface. So: is N=1 sufficiently general? Or should the model allow 
> N=2+ as well? (IP=x,IF=y,chassis=z,...)

I can't think of any case where (IP,ifName,Chassis) does not uniquely
identify an interface.  However to be general, it probably makes sense
to allow this to be extended.

Thanks
Joe


> 
> -Dan
> 
>> IP addresses are not guaranteed to be unique.  Interface names are not 
>> unique.
>> For example, we have plans to deploy around 4 different DNS servers
>> using anycast. All will have the same IP address. All the different 
>> router
>> interfaces connected to the different servers will have the same IP 
>> address.
>> It is possible that they could all be on ge-1/0/0.  The name of the
>> router or chassis is required to distinguish between the connection to a
>> DNS server in California vs one in New York.
>>
>> I think this concept is generally applicable.  Especially if you consider
>> deployment in networks that use nat or private address space where you
>> could have lots of collisions, not just a couple per network.
>>
>>
>> --Joe
>>
> 
>