Hi, >> Having said that, the text about motivating PSP reads: >> PSP allows, for example, for an egress PE to receive a packet >> with a segment in the DA of the outer header without any need to >> process the SRH. >> is a very weak and confusing explanation. Given that 8200 requires >> nodes to be able to ignore any routing header with SL=0, the text as >> written seems to be without benefit. > > Joel, how do you know whether you can ignore a routing header? > I believe that the only option is for the router to process the routing > header to check whether the Segments Left value is equal to zero. > PSP avoids any routing header processing at the egress PE, as the quoted text > above states. Hence the benefit.
What benefit? Sander PS: Just because PSP removed a routing header doesn't mean the egress PE doesn't have to look for any remaining routing headers. From 8200: "Each extension header should occur at most once…". That is a should, not a must And: "IPv6 nodes must accept and attempt to process extension headers in any order and occurring any number of times in the same packet…" That is a must, not a should.
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