User guide

Managing Your Canopy Network March 2005
Through Software Release 6.1
Issue 1 Page 309 of 425
Canopy System User Guide
To monitor a network element (Canopy module), SNMPv2 supports
◦ the get command, which instructs the agent to send information about the
module to the manager in the NMS.
◦ traversal operations, which the manager uses to identify supported objects and to
format information about those objects into relational tables.
In a typical Canopy network, the manager issues these commands to the agents of more
than one module (to all SMs in the operator network, for example).
24.1.6 Traps from the Agent
When a specified event occurs in the module, the agent initiates a trap, for which the
agent sends an unsolicited asynchronous message to the manager.
24.2 MANAGEMENT INFORMATION BASE (MIB)
The MIB, the SNMP-defined data structure, is a tree of standard branches that lead to
optional,
non-standard positions in the data hierarchy. The MIB contains both
◦ objects that SNMP is allowed to control (bandwidth allocation or access, for
example)
◦ objects that SNMP is allowed to monitor (packet transfer, bit rate, and error data,
for example).
The path to each object in the MIB is unique to the object. The endpoint of the path is the
object identifier.
24.2.1 Cascading Path to the MIB
The standard MIB hierarchy includes the following cascading branch structures:
◦ the top (standard body) level:
− ccitt (0)
− iso (1)
− iso-ccitt (2)
◦ under iso (1) above:
− standard (0)
− registration-authority (1)
− member-body (2)
− identified-organization (3)
◦ under identified-organization (3) above:
− dod (6)
− other branches
◦ under dod (6) above:
− internet (1)
− other branches