The MPLS WG Archive

[Thomas Nadeau <tnadeau@cisco.com>]

>I may be entirely wrong, but it seems to me that
>Venkata in his question did not ever refer to xxxOperStatus.

         Yup. My error was just pointed out to me. Sorry, but I have
been on vacation for a week and my mind seems to be
wandering. *)

>AFAIK, xxx RowStatus can be used for disabling an existing
>managed object by setting its value to 'notInService';
>this action can be reversed by setting its value to 'active'.
>As a consequence, some MIBs consider xxxAdminStatus as a read-only
>attribute whose "up" and "down" values are derived from that of
>the xxxRowStatus which is, of course, read-write, and which, for an
>existing object, allows to observe only these two values ('notReady'
>corresponding to the situation when creation of the object is incomplete).
>
>The LSR MIB provides such an example with mplsXCAdminStatus and a
>comment that one more value ('testing') is not required
>(draft-ietf-mpls-lsr-mib-07.txt).
>
>The MPLS-TE MIB which defined mplsTunnelAdminStatus
>(draft-ietf-mpls-te-mib-02.txt) allows it to be set to 'testing',
>too. I assume (and I may be wrong here; I am not a MIB expert) that:
>
>o Setting mplsTunnelRowStatus to 'active' results in the
>mplsTunnelAdminStatus becoming 'up' and vice versa
>o Setting mplsTunnelRowStatus to 'notInService' results in the
>mplsTunnelAdminStatus becoming 'down' and vice versa
>o Setting mplsTunnelAdminStatus to 'testing' results in
>mplsTunnelRowStatus becoming 'notInService'
>o Similar rules apply to any managed object that which admits 'testing'
>as a valid value for its AdminStatus.
>
>Is this correct?

         The mplsTunnelAdminStatus can be set to up, down or
testing once the row has been created, and must be set to one
of these values before the row can be initially created. This can
be used to stop a tunnel's signaled LSPs, or re-enable it. The
operational status should reflect the actual status of the tunnel.
The rowStatus is used to allow the operator to create a new
row, or take it out of service for modification. If a row is
created with the adminStatus set to 'up' the tunnel should attempt
to signal its LSP(s) immediately. If set to 'down', then the tunnel
should just appear in the device's configuration and be ready
to signal as soon as the adminStatus is changed to 'up'. If the rowStatus
of an active tunnel is set to notInService, then the tunnel's operStatus
will go to 'down' and any signaled LSPs for that tunnel should be torn down.
However, I think the tunnel's admin status should first be set to 'down' 
before
modifying the tunnel's attributes.

         --Tom



>With best regards,
>                                    Sasha Vainshtein
>email:     sasha@axerra.com <mailto:sasha@axerra.com>
>tel:       +972-3-7659993 (office)
>            +972-8-9254948 (res.)
>            +972-58-674833 (cell.)
>
>
>
> > -----Original Message-----
> > From: Thomas Nadeau [mailto:tnadeau@cisco.com]
> > Sent: Monday, December 31, 2001 4:38 PM
> > To: Venkata Prasad Piriya
> > Cc: mpls@UU.NET; Shashi
> > Subject: Re: Regarding mplsTunnelAdminStatus
> >
> >
> >
> > >What is difference between mplsTunnelAdminStatus and
> > mplsTunnelRowStatus??
> >
> >          One allows for administrative control by the
> > operator, and one
> > shows the actual operational status of the tunnel. In short,
> > the administrative
> > status is the desired status of the tunnel while the operational
> > status shows the actual status of the tunnel at the time of
> > query. When
> > the desired status is set to a particular value, the
> > operational status
> > should *eventually* reach that same state if possible (see
> > below).
> >
> > >Where exactly mplsTunnelAdminStatus  come into the picture for an
> > >administrator??
> >
> >          It is used to control the tunnel, and it allows the
> > agent to show the
> > actual status of the tunnel.
> >
> > >My assumption is as follows, Please correct me if I am wrong.
> > >
> > >Initially User creates a tunnel using Row Status variable with the
> > >value  CREATEANDGO.
> > >This tunnel will be brought up once row successfully created .
> >
> >          Not exactly. While the tunnel can be created successfully via
> > the row status operation and its administrative (desired) status might
> > be up, the tunnel's operational status might not be because RSVP
> > could not signal an LSP for the tunnel using the constraint parameters
> > you specified.  Only when this happens should the tunnel's operational
> > status be up.
> >
> > >Here after if user wants to
> > >modify any object in tunnel table he has to set
> > mplsTunnelAdminStatus  to
> > >down and set
> > >the desired object. the changes will be reflected only on
> > changing the
> > >Admin status
> > >back to UP.
> >
> >          Yes.  This would also cause any signaled LSPs for
> > that tunnel to be
> > torn-down.
> >
> > >One more question regarding other tables in TE MIB i.e
> > Resource table and
> > >Hop Table.
> > >If user modify some object in HOP table or Resource table
> > will it trigger
> > >modification of
> > >Tunnel's which are presently using these resources or
> > Hop's???  In this
> > >case what role this
> > >mplsTunnelAdminStatus   will play??
> >
> >          No, changes to these tables should not affect a
> > tunnel that has
> > admin and oper
> > 'up' at the time. In fact, the agent should not allow
> > modification to any
> > corresponding
> > hop/resource entries for tunnels that have their
> > operational/administrative
> > states
> > set to up.  Remember, the agent must coordinate the related
> > rows in tables
> > to make
> > sure that they are consistent.  Allowing modification while
> > the tunnel is
> > running
> > would not accomplish this.
> >
> >          --Tom
> >
> >
> > >Please clarify above queries...
> > >
> > >Thanks&Regards
> > >Venkata Prasad P.
> > >
> > >
> > >
> > >
> >
> >
> >
> > --------------------------------------------------------------
> > ----------
> > Mathematics is the supreme nostalgia of our time.
> >



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Mathematics is the supreme nostalgia of our time.