While the node is "asserting" that the two are the same, if you use
different SIDs for OAM compared with data traffic then you are not
actually checking the same forwarding path. You are not using the same
FIB entries. Sure, if everything works right they are the same. But
the whole point of OAM is for when not everything is working right.
Yours,
Joel
On 3/1/2020 8:07 AM, Robert Raszuk wrote:
Nope.
Node can advertise two SIDs or PSP in a given network may be a well know
function (to limit IGP burden) Example: odd SID includes PSP and even
SID does not.
O*A*M packets can use on the exact same path but the penultimate hop
traversal is directed by even SID and is not subject to PSP.
Done.
Thx,
R.
On Sun, Mar 1, 2020 at 5:50 AM Joel M. Halpern <j...@joelhalpern.com
<mailto:j...@joelhalpern.com>> wrote:
Presuming that by "OEM" you mean "OAM", then no, this does not work.
If the OAM is intended to monitor a path that has a last SID whose
flavor is PSP, then something will break. The monitoring will monitor
something else, or it won't monitor the last hop, or...
Given the point that was made that ignoring a source route (SRH or
otherwise) with segments-left = 0 is a mandatory behavior of 8200, I am
really left puzzled as to what use case justifies the contortion of PSP.
Yours,
Joel
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