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User Guide: PTP 800 Licensed Ethernet Microwave
Ethernet bridging
Customer network
Transparent Ethernet service
The PTP 800 Series provides an Ethernet service between the data port at a local
CMU and the data port at an associated remote CMU. The Ethernet service is
based on conventional layer two transparent bridging, and is equivalent to the
Ethernet Private Line (EPL) service defined by the Metro Ethernet Forum (MEF).
The service is transparent to untagged frames, standard VLAN frames, priority-
tagged frames, provider bridged frames, and provider backbone bridged frames. In
each case, the service preserves MAC addresses, VLAN ID, Ethernet priority and
Ethernet payload in the forwarded frame. The maximum frame size for bridged
frames in the customer network is 9600 octets.
Layer two control protocols
The PTP 800 Series is transparent to layer two control protocols (L2CP) including:
x
Spanning tree protocol (STP), rapid spanning tree protocol (RSTP)
x
Multiple spanning tree protocol (MSTP)
x
Link aggregation control protocol (LACP)
x
Link OAM, IEEE 802.3ah
x
Port authentication, IEEE 802.1X
x
Ethernet local management interface (E-LMI), ITU-T Q.933.
x
Link layer discovery protocol (LLDP)
x
Multiple registration protocol (MRP)
x
Generic attribute registration protocol (GARP)
PTP 800 handles IEEE 802.3 Pause frames as a special case; each CMU can be
configured to either forward (tunnel) or discard Pause frames received at the Data
port. PTP 800 discards all Pause frames received at the Management port.
The PTP 800 Series does not generate or respond to any L2CP traffic.
phn-1478_005v000
Apr 2010
Ethernet bridging
1-25
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