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Ethernet bridging
In-band management
In the in-band management mode, the management agent can be reached from the
data port at the local CMU, and (assuming that the wireless link is established) the
data port at the remote CMU. In this mode, the management port is disabled.
Management frames in the customer network are processed by the management
agent if (a) destination MAC address in the frame matches the CMU MAC address,
and (b) the VLAN ID in the frame matches the VLAN configuration of the
management agent.
If Local Packet Filtering is enabled, unicast frames forwarded to the management
agent are filtered, that is, not forwarded in the customer network.
In-band quality of service
Frames generated within the management agent may be assigned a configured
Ethernet priority in the same way as for out-of-band management. PTP 800
provides a dedicated management channel over the wireless link for locally-
generated management traffic similar to the out-of-band management mode.
Ethernet frames received at the Data port are classified into eight traffic classes
(one of which is assigned to management traffic) for transmission at the wireless
port.
Source address learning
If Local Packet Filtering is enabled, the management agent learns the location of
end stations from the source addresses in received management frames. The agent
filters transmitted management frames to ensure that the frame is transmitted at
the Ethernet (data or management) port, or over the wireless link as appropriate. If
the end station address is unknown, then management traffic is transmitted at the
Ethernet port and over the wireless link.
In out-of-band local management mode, management frames are not transmitted
over the wireless link, and so address learning is not active.
Wireless link down alert
The PTP 800 Series provides an optional indication of failure of the wireless link by
means of a brief disconnection of the Copper data port or the Fiber data port. The
Ethernet disconnection occurs at both ends of the link, even for a unidirectional
loss of the wireless link. The Ethernet disconnection normally occurs within 50 ms
of loss of the wireless link.
The Wireless link down alert can be used to trigger protection switching by
Spanning Tree Protocol (STP) or Ethernet Automatic Protection Switching (EAPS)
in a redundant network.
1-28
Chapter 1 Product description
phn-1478_005v000
Apr 2010
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