3Com DSA-3CV1100-02 service manual This section describes central management

80MANAGING THE VCN ACCESS CONCENTRATOR

Central	This section describes central management.
Management

Overview The management agent in the card, in VCN AC slot 1, performs central management of the VCN AC through a proprietary protocol. The management agent supports monitoring and control of all 24 VCN AC ports.

Figure 56 Central Management Message Flow

Statistics and

Status M essages

Q ueries and

C ontrol M essages

M anagem ent Agent (Slot 1)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

Starting with hardware release 2.0, management messages between card 1 and the other 23 VCN AC cards are carried over an internal serial link. Central management message flow is displayed in Figure 56. The internal serial link is not shown in the figure.

In previous releases, management messages between card 1 and the other 23 VCN AC cards are carried over the Ethernet through the Ethernet switch to which the VCN AC is connected. The flows in Figure 56 pass through the Ethernet switch to which the VCN AC is connected. The Ethernet links used by management messages are not shown in the figure.

There are two user interfaces for central management:

■A terminal emulating computer attached to the LMA port in VCN AC slot1

■A Telnet session between a management computer and the VCN AC

The user commands cause the Management Agent in VCN AC slot 1 to issue queries and control messages to all the cards in the VCN AC. The