Hi Qin, Ive reviewed this draft. I think one of the advantages of DNS based PCE discovery is its query-response mechanism. Compared with OSPF based or ISIS based PCE discovery, which uses advertisement mechanism, using query-response mechanism can avoid unnecessary advertisement and reduce a large amount of unwanted traffic, especially when PCE information needs frequent changes. It would be good to further explain the query-response mechanism of DNS based PCE discovery in the draft.
Thanks and Regards, Claire
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