Schmid Watson Specifications download pdf (Page 85)

Revision: 2006-04-27

8-1

8 SNMP

8.1 Introduction

The Watson 5 Ethernet plugin contains a built-in SNMP agent. The agent is accessible through the

front-panel Q interface connector or through Ethernet inband management, either from an Ethernet

user interface or over the DSL Ethernet payload, cf. 3.5.

The agent uses standardized Management Information Bases (MIBs) to represent the managed ob-

jects of the plugin, its interfaces, the DSL spans and the Ethernet bridging functions. All supported

variables are listed in chapter 8.2.

The Watson 5 Ethernet tabletop modem when connected as DSL slave to a Watson 5 Ethernet

plugin is manageable through the SNMP agent of the plugin. The tabletop modem is modeled with a

vendor-specific MIB (Schmid Telecom HDSL MIB, cf. 8.2.12).

If two Watson 5 Ethernet plugin modems are connected back to back then each is managed by its

own SNMP agent. In this situation the slave modem will normally use Ethernet inband manage-

ment.

8.1.1 AgentX

Several Watson 5 Ethernet plugin cards installed in the same subrack act as a single SNMP agent

towards the management system. The agents on the individual plugins cooperate to form one com-

mon data structure of the management information available on each plugin.

Within a subrack SNMP functions are divided between

! a single processing entity called the master agent, which sends and receives SNMP protocol

messages in an agent role

! several processing entities called subagents, which are "shielded" from the SNMP protocol

messages processed by the master agent, but which have access to management information.

From the management systems point of view this combination of one master agent and several

subagents behaves exactly as would a single agent that has access to the all management informa-

tion within the subrack.

The communication between master agent and subagents uses the AgentX protocol which has

been standardized as RFC 2741.

Subrack-wide information (e.g. inventory of subrack slots and the plugins contained in the slots) is

handled by a rack agent. This rack agent is a subagent residing on the same plugin as the master

agent.

1 2 ... 80 81 82 83 84 85 86 87 88 89 90 ... 102 103

No comments

Schmid Watson Specifications Page 85