The MPLS WG Archive

[Abhishek Choudhary <achoudhary@in.allegronetworks.com>]

Title: RE: mplsTunnelHopTableIndex and mplsTunnelPathInUse

Apratim
        see it this way. normally every tunnel will have one corresponding HopListIndex(mplsTunnelHopTableIndex), which will have multiple PathOptionIndex corresponding to each instance of the tunnel(mplsTunnelPathInUse), each consisting of multiple HopIndex(es).

so two tunnel instances will have the same HopListIndex but different PathOptionIndex.

abhishek

-----Original Message-----
From: Apratim Mukherjee [mailto:ApratimM@netbrahma.com]
Sent: Monday, July 30, 2001 2:35 PM
To: 'Abhishek Choudhary'
Cc: 'mpls@UU.NET'
Subject: RE: mplsTunnelHopTableIndex and mplsTunnelPathInUse

Hi Abhishek,

        > if u look at the mplstunnelHopTable it's triply indexed.
>mplsTunnelHopTableIndex is the first and mpldTunnelPathInUse is the >second
index to that table. using these two indexes u get a list of hops >which is
being used by this tunnel instance.

Ya , you are right . But would not the values of the two indexes be the same
for any tunnel instance , as Abhay also pointed out . If two indexes have
the same value , wouldn't that mean a duplication ? Or is that the Hop Table
could look like this :

HopListLindex  PathOptionIndex HopIndex [ Hop Details ]
        1                       1              1                ERO1
        1                       1              2                   ERO1
        1                       1           3                   ERO1
        1                       2              4                   ERO2
        1                       2              5                   ERO2
        1                       2              6                   ERO2
        1                       2              7                   ERO2

        where the ERO1's denote the subobjects of the primary ERO
        and ERO2's denote the subobjects of the secondary ERO ?

        In the normal case then HopListIndex = PathOptionIndex always and
also HopListIndex is a misleading name as it is the index to TWO hop lists
and is not an unique identifier of a Hop List .

        Thanks
        Apratim

> -----Original Message-----
> From: Apratim Mukherjee [ mailto:ApratimM@netbrahma.com]
> Sent: Saturday, July 28, 2001 7:02 PM
> To: mpls@UU.NET
> Subject: mplsTunnelHopTableIndex and mplsTunnelPathInUse
>
>
> Hi,
>
> Could someone explain as to what is the difference between the
> mplsTunnelHopTableIndex and mplsTunnelPathInUse objects in the
> mplsTunnelTable . Dont they both point to an Explicit Route for the tunnel
> ?
>
> Thanks,
> Apratim
>
>