[RPRWG] OAM Proposal (ib_oamp_02)
Folks,
Looking at RPR OAM proposal and fault management there seems to be a
couple of issues. I appreciate it if the points below are clarified.
Thanks, Siamack
In "ib_oamp_02" the purpose of introducing MAC layer ping and continuity
check seems to be twofold:
- to detect problems between the Phy and the MAC layer
- to deal with an station which may "steal" packets addressed to some
other station e.g. a station with dual identity
Now since each station has an east and a west facing Phy, the ping test
can not pin-point the Phy-MAC interface failure. This failure may be
due to the west facing Phy-MAC of this station or the East facing
Phy-MAC of the next station on the ring. I believe the common practice
for detecting such problems is a set of local loop back tests.
In the second failure mode a dual identity station would simply reply to
a ping whether its is destined to it or its dual identity. I guess the
reason behind this packet "stealing" is not clear as one can figure a
number of plausible response scenarios where the ping is not successful.
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