Allied Telesis AT-S99 - Manual (Page 45)

AT-S73 and AT-S99 Management Software User’s Guide
45
running a spanning tree protocol, the protocol might become confused as
the status of the device’s link to the media converter constantly changes.
OAM Visible
Mode
OAM is a set of tools and utilities for remotely monitoring, testing, and
troubleshooting a network. It provides network operators the ability to
monitor the condition of the network and determine the location of the
failing links or fault conditions. For background information, refer to the
IEEE 802.3ah standard.
AT-CM Line Cards set to the OAM visible operating mode support OAM on
port A, the fiber optic port. They can initiate and participate in the OAM
discovery process by sending and processing OAM control packets,
referred to as OAMPDUs, on the fiber optic ports.
Line cards set to this operating support several additional features, some
of which are part of the IEEE 802.3ah standard for OAM while others are
specific to the Converteon product line. These features are:
ˆ OAM loopback test to test the quality of the fiber optic cable that links
two AT-CM Line Cards.
ˆ Dying gasp to notify you when a remote AT-CV1203 Chassis loses
power.
ˆ Remote peer management for monitoring and configuring remote
AT-CM Line Cards through their local line card counterparts in a
managed chassis.
ˆ Downloads of new versions of the AT-S73 Management Software to
remote AT-CM Line Cards.
ˆ OAM variable retrievals to examine the values of MIB objects on OAM-
compliant devices.
For background information on these features, refer to “OAM-based
Features” on page 46.
OAM Bypass
Mode
Cards in this OAM operating mode ignore OAMPDUs and so do not
support any of the OAM features. Instead, they forward OAMPDUs as
normal network traffic.
Setting the
Operating Mode
There are two ways to set the operating modes on the AT-CM and AT-CV
Media Converter Line Cards. You can use the DIP switches on the line
cards or you can use the AT-CV5M02 Management Card. If you use the
management card, the DIP switches are deactivated, and reactivating
them requires the management card. For instructions on how to set the
operating modes of the line cards, refer to “Setting the Operating Mode” on
page 145.