The MPLS WG Archive

[Thomas Nadeau <tnadeau@cisco.com>]

>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.
>
>
>
>



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