Possible Contradiction re use of GAL in pwe3-static-pw-status
2010-06-02 13:57:13 GMT
The section 5.4.1 of the static-pw-status draft appears to allow me to use the GAL on a PW which is not using the control word, that’s nice, since some PWs do not use the CW.
5.4.1. Label stack for a message destined to the next PEA PE that needs to forward a PW OAM status message to the adjacent PE across the PSN tunnel, MUST set the PW label TTL field to 1. Furthermore if the control word is not in use on the particular PW, the PE MUST also place the GAL reserved label [RFC5586], below the PW label also with the TTL field set to 1.
However from RFC 5586 I see.
RFC 5586 4.2. GAL Applicability and Usage
In MPLS-TP, the GAL MUST be used with packets on a G-ACh on LSPs,
Concatenated Segments of LSPs, and with Sections, and MUST NOT be
used with PWs. It MUST always be at the bottom of the label stack
(i.e., S bit set to 1).
This appears to preclude the use of the GAL on a PW.
So, how can I run pw-status on a PW and not violate RFC 5586. I’m sure there’s some subtlety I am missing here so hoping for clarity.
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