4.3.3 L2 Sub-system
L2 sub-system mainly implements configuration management (management layer) of
data link layer, L2 protocol processing (control layer), and data forwarding (data layer or
service layer).
Figure 4-8 L2 system structure
4.3.4 NM and Maintenance Sub-system
Foreground network management and operation maintenance sub-system use TCP/IP to
work as SNMP network management agent. They use the executive body of managed
entity in lower layer to implement management. By network communication background
and foreground network management take management of foreground system and
realize separation of management network and transport network.
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