Hello Team,
I found below SR-ERO validation in RFC 8664, 5.2.1
<https://datatracker.ietf.org/doc/html/rfc8664#section-5.2.1>. SR-ERO
Validation
The SR-ERO subobjects can be classified according to whether they
contain a SID representing an MPLS label value or an index value, or
no SID. If a PCC detects that the SR-ERO subobjects are a mixture of
more than one of these types, then it MUST send a PCErr message with
Error-Type = 10 ("Reception of an invalid object") and Error-value =
20 ("Inconsistent SIDs in SR-ERO/SR-RRO subobjects").
As per my understanding of the above text, there could be three types of
SIDs:
1. *SID index: *S-bit = 0, M = 0,C = 0
2. *SID as MPLS label:* S-bit = 0, M = 1, C = 0/1
3. *Null:* S-bit = 1
Now, if a LSP contains 3 SR-ERO subobjects then all those three should have
the same SID type, e.g. all may be type 1, or type 2 or type 3 and there
shouldn't be any combination of these 3 types.
Is this understanding correct? Please let me know.
Thanks,
Mrinmoy
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