Specifications

Chapter 1 Introduction Installation and Operation Manual
1-20 Functional Description MPW-1 MP-4100 Ver. 2.0
Each switching subsystem port is supported by an independent MAC controller
that performs all the functions required by the IEEE 802.3 protocol.
The local Ethernet switching subsystem performs classification and switching
functions among its ports. The Ethernet switch determines the destination of
each frame in accordance with the configured Ethernet flows. The classification
of each user network is based on the VLAN ID, or on the port, if no
customer-side VLAN ID (C-VLAN) is configured. The switch will directly forward
Ethernet traffic carrying locally-terminated pseudowires to local Ethernet ports;
any other traffic will be forwarded through the MPW-1 Fast Ethernet data bus to
the CL module, for processing by the CL module Ethernet traffic handling
subsystem.
Ethernet Termination and Processing
The Ethernet termination and processing function provides an interface between
the Ethernet switching subsystem and the local TDM cross-connect matrix: in the
transmit direction, the payload received from TDM media is packetized and
inserted in Ethernet frames for transmission to the appropriate Ethernet port.
The reverse operation is performed for the incoming Ethernet frames.
Controlling Pseudowire Routing
The Megaplex-4100 router function is used to route pseudowire packets
generated by the MPW-1 modules installed in the chassis to their destination. It
also provides ARP services.
The terms and parameters needed by the Megaplex-4100 router function to
support pseudowire routing are explained below:
• Router interfaces: the Megaplex-4100 router function supports up to 100
router interfaces, each assigned a unique index number. Each router interface
has its own IP address; you must also specify an IP subnet mask, and the
module and port on which interface is located.
For each router interface, you can also enable the use of VLAN tagging and
specify a VLAN ID, to enable differentiating the traffic carried by this router.
Note that when the router interface is located on a GbE port or a VCG, VLAN
tagging is always enabled.
Each MPW-1 supports up to 6 different router interfaces; additional
interfaces can be configured on any bridge port in the Megaplex-4100. The IP
address of the appropriate interface is automatically inserted as the
pseudowire source IP address.
For Megaplex-4100 equipped with CL.1 or CL.1/155 modules, you can define
router interfaces only on the Ethernet ports of the same MPW-1 module.
• Pseudowire peers: the pseudowire destination is referred to as the
pseudowire
peer . Megaplex-4100 supports up to 100 peers, each assigned a
unique index number. The index number is then used to specify the
pseudowire destination, instead of directly providing the necessary
destination information. To configure a peer, it is necessary to provide its IP
address, and as an option – the next hop IP address.
Pay attention to the following points:
Note