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TE MIB - LSR MIB integration

  • From: Roberto.Guglielmi@alcatel.it
  • Date: Tue, 26 Nov 2002 09:36:57 +0100
  • CC: mpls@UU.NET
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Hi Yuan,
Thanks for your help. See my question at the end please.

Yuan Gu wrote:

>Hello, Roberto:
>
>  
>
>>-----Original Message-----
>>From: owner-mpls@UU.NET [mailto:owner-mpls@UU.NET]On Behalf Of
>>Roberto.Guglielmi@alcatel.it
>>Sent: Monday, November 25, 2002 3:19 AM
>>To: mpls@UU.NET
>>Subject: TE MIB - LSR MIB integration
>>
>>
>>Hello everybody,
>>I have a doubt about interactions between LSR MIB and TE MIB for what
>>concerning LSPs nested in TE tunnels.
>>Consider the following scenario:
>>
>>R1 -------- R2 -------- R3
>>
>>and suppose, for example, I have three incoming flows. I want to insert
>>each flow in one LSP and tunnel the three LSPs in one TE tunnel.
>>My questions are:
>>
>>1) How are the three LSPs mapped on the same TE tunnel?
>>    
>>
>
>There will be 3 entries in mplsTunnelTable. Each entry has different
>mplsTuunnelInstance.
>
>The mplsTunnelInstance "Uniquely identifies an instance of a tunnel. It is
>useful to identify multiple instances of tunnels for the purposes of backup
>and parallel tunnels."
>You may want to put your LSPID into this field.
>
>  
>
>>2) Is there only one entry in the mplsTunnelTable pointing to one entry
>>in the mplsXCTable?
>>    
>>
>
>There will be 3 corresponding entries in mplsXCTable. Each entry has
>different mplsXCLspId (RSVP-TE or CR-LDP).
>
>
>
>  
>
Suppose I have three incoming Ethernet TLS flows on R1. Following Martini's draft, I should encapsulate Ethernet frames with a stack of two labels: the bottom label being the VC label, while the top label being the tunnel label. In other words, R1 has to push two labels on every incoming frame where the one at the top is always the same.
I suppose each entry in mplsXCTable should point to a not null mplsLabelStackTable containing the corresponding VC label. If the tunnel label is set up by means of RSVP-TE and the VC label by means of LDP, how does R1 decides that the VC label has to be put in the mplsLabelStackTable and not in a new separate entry in mplsXCTable? What information of the RSVP messages are used to accomplish this?

Regards Roberto