Media Links MD8000 Series, Руководство по эксплуатации

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MD8000 Rev. H MD8000 Series Transport System Summary 2.33
Dual SWCNT Operation
Overview
The MD8000 system allows a 1+1 redundant configuration with two (2) SWCNT boards
installed in a chassis, where the two boards continuously monitor the state of the other board
as Active or Stand-by communicating with the HA (High Availability) function.
Table 2-13 shows SWCNT functions that can be performed by the SWCNT ( O ), or cannot be
performed by the SWCNT ( X ), in the Active/Standby state.
Figure 2-29: SWCNT Operation
Table 2-13: SWCNT Operation
Function Active Standby
CPU Part Receiving the route control information from the
supervisory terminal
O X
Monitoring and controlling the Channel Service boards
O X
Monitoring and controlling the Trunk boards
O X
Transmitting information to the other SWCNT board
O X
Receiving information from the other SWCNT board
X O
Setting the L2SW table in its own SWCNT board
O X
Setting the L2SW table in the other SWCNT board
O X
L2SW Part Dynamic routing of Data packets
O X
Static routing of Stream packets
O O
MD8000
SWCNT Active
Switch-
ing
Hub or
Network
CPU L2SW
Memory
MIB/Web Access
PC
Control
Store
Channel
Service
Boards
Control
Ether
Ether
SWCNT Stand-by
CPU
L2SW
Memory
HA
Discard - Channel
Control Information
through the Ethernet I/F
Receive – Channel
Control Information
through the HA function
Store
The Stand-by SWCNT
receives and uses the
Channel Control Information
given through the HA function
instead of the one given
through the Ethernet interface.
Control