Subject: MH-PW forwarder identification

From: [email-masked]
Date: Sun, 6 Mar 2005 20:37:15 -0000

Luca, et al

[1] From draft-ietf-pwe3-control-protocol-15.txt: “The Attachment Identifier must be unique in the context of the PE router in which the Forwarder resides.  The combination <PE router, AI> must be globally unique.”

[2] From draft-martini-pwe3-pw-switching-02.txt: “The PWID is a unique number between each pair of PEs. Hence Each SH-PW that forms a MH-PW may have a different PWID. In the case of The Generalized PW FEC, the AGI/SAI/TAI may have to also be different for some, or sometimes all, SH-PWs.”

If AIs are allowed to be reused for different MH-PW segments as implied by the phrase “may be different” in [2], then the requirement in [1] that the combination <PE router, AI> must be globally unique will not be met. Instead only the combination <PE source router, PE destination router, AI> will be unique. We should not loose the ability (particularly for troubleshooting purposes) to uniquely identify a forwarder based on the <PE router, AI combination>. Therefore, IMO the MH-PW switching document should state that MH-PWs segments must (not may) use different AIs (i.e. PWIDs, or SAII/TAIIs).

What is the reasoning behind stating in [2] that they may be different for some or sometimes all SH-PWs?

Regards,
Richard

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