Re: [OPSAWG] IPv6 zoneid in SNMP

[Brian E Carpenter <[e-mail]>]

On 2012-02-05 06:19, Juergen Schoenwaelder wrote:
> On Sat, Feb 04, 2012 at 03:18:37PM +0100, t.petch wrote:
>> [RFC4001] defines a 4 byte zone index for IPv6 with a display hint of 'd'
>>
>>  "InetAddressIPv6z ::= TEXTUAL-CONVENTION
>>      DISPLAY-HINT "2x:2x:2x:2x:2x:2x:2x:2x%4d"
>>      DESCRIPTION
>>          "Represents a non-global IPv6 network address, together
>>           with its zone index:
>>             Octets   Contents         Encoding
>>              1-16    IPv6 address     network-byte order
>>             17-20    zone index       network-byte order
>>
>> Is this in use?
>>
>> I ask because 
>> draft-carpenter-6man-uri-zoneid-00.txt
>> under discussion on the 6man list, has ABNF of
>>  ZoneID = 1*15unreserved
>> which is a bit different (well, completely different:-(
> 
> You can identify an interface by a number (ifIndex in SNMP land) or by
> a name. In other words, you can either identify an interfaces by using
> the result of if_nametoindex() [RFC3493] or its argument.
> 
> On command lines and in URLs, systems and humans usually prefer names
> - internally systems usually prefer numbers (and SNMP land is
> typically closer to internal APIs and uses ifIndex values natively to
> identify interfaces).

Exactly, and the mapping between the two forms is a host-specific function.
We'll mention this in the next version of draft-carpenter-6man-uri-zoneid.

   Brian