[mpls] draft-ihle-mpls-mna-stateless-egress-protection-00 - alternative approach
Stewart Bryant <stewart.bryant@gmail.com> Wed, 06 November 2024 13:37 UTC
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From: Stewart Bryant <stewart.bryant@gmail.com>
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Date: Wed, 06 Nov 2024 13:37:17 +0000
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Subject: [mpls] draft-ihle-mpls-mna-stateless-egress-protection-00 - alternative approach
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An alternative strategy to encoding the alternate path labels “strangely” in the MNA header and then needing to construct a new stack by reformatting the MNA data into real labels is to have an MNA action : IF no repair POP n else ignore (or POP) action. So the stack looks like LSE to PLR MNA Action POP n if no repair LSE to C’ LSE to C’' Etc Note that delivery is not the only thing you need to worry about you need worry about the application labels which both egress nodes need to worry about. So what happens At the PLR it is determined if the link to C is up and C is alive. If C is OK POP (or cleans) MNA header and the labels to the value n in its parameter. In the above case n = 2. If C is not OK POP (or cleans) MNA header At this point we now have a set of LSEs at TOS that will execute the repair and get the packet to the alternate exit for C. Note that the solution needs to consider what happens to the MNA header if more than one MNA action is present (proposed solution and this alternate) and what happens to application labels which need to be understood at C and the alternate to C. This seems simpler and much more aligned with the existing MPLS architecture. Best regards Stewart
- [mpls] draft-ihle-mpls-mna-stateless-egress-prote… Stewart Bryant
- [mpls] Re: draft-ihle-mpls-mna-stateless-egress-p… Fabian Ihle