Hi Authors, (as individual contributor)
I reviewed the draft, and have the following questions: 1. About PSD definition, in section 3.2, there are the following texts: " A penultimate SRv6 Segment Endpoint node is one that, as part of the SID processing, copies the last SID from the SRH into the IPv6 Destination Address and decrements the Segments Left value from one to zero. " " The PSD operation *only takes place at the egress node *and does not happen at any transit node. When a SID of PSD flavor is processed at a transit node, the PSD behavior is not performed as described in the pseudocode below since Segments Left would not be 1 or 0. " so to my understanding, P2 is the penultimate endpoint in the example in Figure 1, correct? however there is "PSD-flavored SID" on PE3. Please clarify. 2. In Section 4, "After the configuration, PE1 determines that PE3's backup SID is PE4's VPN SID through the routing optimization strategy of BGP." . Can you please elaborate how PE1 decides PE4 to be the backup SID? What if the path for P2 to reach PE4 is P2->PE3->PE4? 3. In section 3.4, it mentions that P2 could be several hops away from the egress node. In this case, if PE3 fails, how does P2 detect the failure of PE3 quickly? What if a link between P2 and PE3 fails? Thanks, Yingzhen
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