Hello, everyone!
The HW ECC solution establishes ECC routes using the shortest path first algorithm. "Shortest path" means that the path contains the least number of NEs compared with other paths. It does not mean that the physical reach is the shortest. The following describes how an NE establishes an ECC route:
a. The physical layer of the NE maintains the status information for the DCC channel corresponding to a line port.
b. The MAC layer of the NE establishes the MAC connections leading to the adjacent NEs.
The NE periodically broadcasts the connection request frame (MAC_REQ) to the adjacent NEs.
When receiving the MAC_REQ frame, the adjacent NEs send back a response frame (MAC_RSP).
The NE establishes the MAC connection between itself and either adjacent NE when receiving the MAC_RSP frame within the specified time.
c. The network layer of the NE creates its network-layer routing table.
The NE creates an initial network-layer routing table based on the established MAC connections.
The NE periodically broadcasts its routing table to the adjacent NEs through the routing response message.
When receiving the routing response message, the adjacent NEs update their own network-layer routing tables based on the shortest path policy.
At the next routing broadcast time point, the NE broadcasts the current network-layer routing table.
ECC Network Division Principle
ECC Network Division Solution:
a. The suggested scale of an ECC subnet is within 50 NEs and the maximum scale is 100 NEs.
b. If the NEs on an ECC network exceed 50, it is suggested that gateways be added to divide the network into multiple subnets.
c. DCC channels are prohibited between ECC subnets.
d. When an ECC network is divided, an
external DCN must be planned.
e. The ECC route protection function cannot be affected in
the ECC network division.
Principle for the Extended ECC Plan:
a. The NE supporting the extended ECC feature is used and IP addresses must be in the same network segment.
b. A loop is not allowed when an extended ECC network is formed using hubs and serial ports of NEs.
c. When a hub is used in the extended ECC networking, it cannot
be connected to other devices.
d. The NEs (including servers and
clients) on an extended ECC network cannot exceed eight; otherwise, the NEs
will be reset. If the scale is no more than four, the ECC can be extended
automatically. If the scale is more than four, the ECC must be extended manually.
e. Extending ECC manually is recommended, because the manual
mode can reduce negotiations between NEs, and fewer resources are occupied.
f. When connected to the NMS using a hub, the gateway NE cannot automatically extend the ECC.
g. When the ECC is extended manually, the NE near to the NMS is recommended as the server for TCP connections and other NEs as clients. The port number ranges from 1601 to 1699.
That's all, thanks!
