Allied-telesis AT-S70 Instrukcja Użytkownika Pobierz pdf (Strona 88)

Chapter 8: Operations, Administration, and Maintenance (OAM)

One important aspect of the IEEE 802.3ah OAM spec is that an OAM

entity may be in either Active or Passive mode.

 Active Mode – Active-mode stations forward OAM communications

and can send queries and commands to a remote station.

 Passive Mode – Passive-mode stations wait for the peer station to

forward OAM communications and then respond to commands and

queries. Generally, passive-mode do not initiate communications.

By default, the Converteon line card should come up in Passive mode for

OAM discovery (as per the IEEE 802.3ah). In order to initiate OAM

discovery, the line card needs to be configured in the Active mode by the

AT-CV5M01 CPM card. Therefore, if a line card is in a chassis with no

CPM card, it will come up in Passive mode.

The difference between the modes is that an OAM active-mode station

has more control on its peer than an OAM passive-mode station. For

example, an active-mode station can put a passive-mode station into

loopback mode, but not vice versa.

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Allied-telesis AT-S70 Instrukcja Użytkownika Strona 88