User`s guide

XSR User’s Guide 41
Chapter 2 Network Management through SNMP
Managing the XSR
Variables to be configured include: community name, traps, and host. SNMP v3
support includes options to specify an engineID, security values for users and
groups, and associated
show commands. Also, the snmp-server view
command is an especially powerful tool to display SNMP objects either via
their SNMP term or numerical ID. SNMP v3 data is stored in the
private-
config file in Flash. Although SNMP is disabled by default, entering any
SNMP configuration command except
snmp-server disable will enable the
SNMP server.
For a full description of SNMP commands, refer to the XSR CLI Reference
Guide. Also refer to NetSight Atlas Router Services Manager v2.0
documentation to query and change SNMP values. Because the SNMP
manager is disabled at boot-up, you must either manually enable the SNMP
manager using the CLI, or enable it in
startup-config.
NOTE
The XSR allows a total of 20 read-only and 20 write-only communities.
Shaping Trap Traffic
Two controls are available to manage network traffic caused by SNMP traps.
The first, set by the
snmp-server min-trap-spacing command, configures
minimum spacing between successive traps to ensure that they are spaced
without causing delay.
The second control defines the maximum number of traps that can be sent in
a given time window. The time window is a moving sum of the number of
traps sent to the network. If the number of traps sent in the previous window-
time is less than the value set by the
snmp-server max-traps-per-window
command, then more traps can be sent.
Both methods work simultaneously and independently and only when both
are satisfied will a trap be sent. Otherwise, traps will be queued and sent as
soon as conditions satisfy both traffic shaping methods.
NOTE
The XSR permits a total of 20 trap servers.