The MPLS WG Archive

[Bob Thomas <rhthomas@cisco.com>]

Chetan,

> Hi,
> 	I was looking thro' the rfc 3036. 
> 
> At section 3.5.10 (page 73) it is mentioned 
> 
>    If an LSR receives a Label Abort Request Message after it has
>    responded to the Label Request in question with a Label Mapping
>    message or a Notification message, it ignores the abort request.
> 
> And in thge Appendix at Page 106 it is mentioned.
>       
>       LAbR.6  Generate Event: Received Label Release Message for FEC
>       from MsgSource.  (See Note 2.)
>       Goto LAbR.11.
> 
> 
> I feel that we have to follow what is mentioned in the section  3.5.10,
> since it makes sense for the upstream(MsgSource) to release the Label
> explicitly based on its retention mode. Let me know how do U think ??
> 
> 
> Thanks
> Chetan S


LAbR.6 handles the following situation:


   MsgSource ------ LSR ------ R ...

where:

- LSR has received a label mapping for FEC from R;
- LSR has not yet sent a label mapping for FEC to MsgSource;

In this case LSR may need to release the label mapping it
received from R.

So far as LSR is concerned this situation is identical to one where it
had sent a label mapping for FEC to MsgSource and subsequently
received a label release for FEC from MsgSource.  Therefore, this
situation can be handled by LSR by behaving as if it has received a
label release for FEC from MsgSource.


Bob