[c-nsp] ios-xr asr9k ipv6IfAdminStatus does return next instance if it does not exist

[Tony Tauber]

Jared,

Perhaps you could sell your test suite (to Cisco, for starters).

For this kind of thing where the SNMP data structures seem to go all wiggy,
it may point to some underlying problem that isn't the SNMP stack itself;
though it could well be.

Tony

On Tue, Dec 16, 2014 at 12:23 PM, Jared Mauch <jared at puck.nether.net> wrote:
>
> On Tue, Dec 16, 2014 at 10:28:26AM +0100, Florian Lohoff wrote:
> >
> > After digging into this a bit more
> >
> > On Tue, Dec 16, 2014 at 05:40:43AM +0100, Florian Lohoff wrote:
> > >
> > > Hi,
> > > did anyone see something like this?
> > >
> > >     $ snmpget -c public -v 2c asr9k-corerouter ipv6IfAdminStatus.77
> > >     IPV6-MIB::ipv6IfAdminStatus.79 = INTEGER: up(1)
> > >
> > > Asking for instance .77 and get .79.
> >
> > It seems this is a clear violation of the SNMPv2 RFC 1905
> >
> >     RFC1905 4.2.1. The GetRequest-PDU
> >     [ ... ]
> >     (1)  If the variable binding's name exactly matches the name of a
> >          variable accessible by this request, then the variable binding's
> >          value field is set to the value of the named variable.
> >
> >     (2)  Otherwise, if the variable binding's name does not have an
> OBJECT
> >          IDENTIFIER prefix which exactly matches the OBJECT IDENTIFIER
> >          prefix of any (potential) variable accessible by this request,
> then
> >          its value field is set to `noSuchObject'.
> >
> >     (3)  Otherwise, the variable binding's value field is set to
> >          `noSuchInstance'.
> >
> > So it should return with `noSuchInstance' not some other random
> interfaces
> > IPv6 status.
>
>         Did you report the issue to Cisco so they can fix this?
>
>         We've ended up building a regression suite to test the SNMP stack
> of any
> new release that checks for these types of defects.
>
>         - Jared
>
> --
> Jared Mauch  | pgp key available via finger from jared at puck.nether.net
> clue++;      | http://puck.nether.net/~jared/  My statements are only
> mine.
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