Hi, As I had mentioned at the mic, the IPv6-SR-header draft proposes to use an ordered list of IPv6 addresses to represent an explicit path. In this way, there is no need for any IGP extension. That's fine although I don't know whether such a trade-off is much worthwhile (i.e., encapsulation overhead vs control plane change). However, in the IGP extension for SR drafts, there are still some descriptions about the 32-bit SID. Does it mean we may come back someday to consider how to use an ordered list of SIDs instead of an ordered list of IPv6 addresses to represent an explicit path. If so, I wonder why not directly use an ordered list of (MPLS) labels rather than an order list of 32-bit SIDs. By using an ordered list of labels (i.e., a label stack) in the packet, the underlay could be IPv4, IPv6 and even MPLS. In other words, such an SR header is transport-independent. In a word, I just wonder whether we do need so many various solutions.
Best regards, Xiaohu
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