[rbridge] last call comment
jeffpick at broadcom.com
Wed Jul 1 10:53:34 PDT 2009
"When building the tree number j, remember all possible equal cost
parents for node N. After calculating the entire "tree" (actually,
directed graph), for each node N, if N has "p" parents, then order
the parents according to 7-byte ID. For tree j, choose N's parent as
choice j mod p."
I really dont like the idea of keeping all P parents, esp in an environment
like fat tree where there may be dozens (64?) of upstream equal cost parents (times thousands of nodes).
To require this will be a huge overhead. That said, we should at least say whether "order the parents"
means starting with lowest or highest.
"In this case, R1-R2 adjacencies are ordered as follows, with
the one "most preferred" adjacency being the one that R1 transmits
to R2 on, and the one that R2 accepts traffic from R1 on:"
The way I read this, the statement is meaningless, R1 and R2 both transmit to each other. So
either the intent is to say R1 (or R2) is the RB closer to the root. Or the intent is to say that depending
on whether traffic is flowing towards or away for the root, you may choose a different adjacency. Whichever
interpretation is intended should be clarified.
"Most preferred are those established by P2P Hellos with tie-
breaking among those based on preferring the one with the
numerically highest Extended Circuit ID."
According to rfc 5303, there is no concept of a shared extended circuit ID, only the ext cid advertised by
each side. So this should be state which RBs ext cid is intended.
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