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LDP MIB, version 9 outstanding issue

  • From: riza.cetin@alcatel.be
  • Date: Wed, 16 Apr 2003 09:38:18 +0200
  • Cc: ravi.malhotra@alcatel.be, jcucchiara@mindspring.com, mpls@UU.NET, nj@dataconnection.com, hans@ipunplugged.com, james_luciani@mindspring.com, jcucchiara@artel.com
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"Thomas D. Nadeau" wrote:

> >5. How can we represent label-stacking in LDP via this MIB. The
> >label-stacking could be either
> >- LDP LSPs over RSVP-TE tunnels.
> >- PWE-LDP (Martini) LSPs over core LDP/RSVP - LSPs.
> >
> >Suggestion - Each core LSP (LDP/RSVP) can be represented by an if-index
> >in the IF-MIB. If we include the if-index in the above tables then we
> >can find out whether the LSP goes via a physical-interface or a
> >'tunnel-interface'.
>
>          I don't understand how assigning an IfIndex to an LSP is going to
> work.  This sounds like something that is implementation-specific.

MPLS-TE MIB (draft-ietf-mpls-te-mib-09.txt) allows for defining an MPLS tunnel
as an interface.
mplsTunnelIsIf object is set to true(1) for tunnels to be used as interface
and an entry is created in the ifTable with the ifIndex of the tunnel.

Below is the text from the MPLS-TE-MIB.

mplsTunnelEntry OBJECT-TYPE
   SYNTAX        MplsTunnelEntry
   MAX-ACCESS    not-accessible
   STATUS        current
   DESCRIPTION
        "An entry in this table represents an MPLS tunnel.
          An entry can be created by a network administrator
          or by an SNMP agent as instructed by an MPLS
          signalling protocol. Whenever a new entry is
          created with mplsTunnelIsIf set to true(1), then a
          corresponding entry is created in ifTable as well
          (see RFC 2863). The ifType of this entry is
          mplsTunnel(150)."

>
> The label stack is represented either in the LSR MIB as it is
> defined today.  If you want to see the application-specific label,
> then look in the PWE3 MIBs as a short-hand. The PPVPN-MPLS-VPN MIB is
> also going to be modified to show the VPN label as well.  However,
> in either case, the ingress labels should be available in the LSR MIB
> as a point of reference.
>

How would you represent the tunneling LDP into RSVP-TE at the ingress LSR of
the RSVP-TE tunnel?
Where would you store the labels (LDP label and RSVP label) that need to be
pushed? In the label stack table of the LSR-MIB or higher layer.

Regards, Riza.

>
>          --Tom
>
> http://www.elsevier-international.com/catalogue/title.cfm?ISBN=155860751X