Network Management through SNMP
2-40 Managing the XSR
Alarm Management (Traps)
The following events are supported by SNMP traps: snmpTrapColdStart, snmpTrapWarmStart,
snmpTrapLinkDown, snmpTrapLinkUp, snmpTrapAuthFailure, entityTrapConfigChange,
frameRelayTrapfrDLCIStatusChange, ospfTrapIfStateChange, ospfTrapVirtIfStateChange,
ospfTrapNbrStateChange, ospfTrapVirtNbrStateChange, ospfTrapIfConfigError,
ospfTrapVirtIfConfigError, ospfTrapIfAuthFailure, ospfTrapVirtIfAuthFailure, ospfTrapIfRxBadPacket,
ospfTrapVirtIfRxBadPacket, ospfTrapTxRetransmit, ospfTrapVirtIfTxRetransmit, ospfTrapOriginateLsa,
ospfTrapMaxAgeLsa, ospfTrapLsdbOverflow, ospfTrapLsdbApproachingOverflow, bgpTrapEstablished,
and bgpTrapBackwardTransition.
SNMP alarms are listed in Appendix A: “Alarms/Events, System Limits, and Standard ASCII
Tabl e” on page A-1.
Network Monitoring via Service Level Agreement Agent
The XSR supports a Service Level Agreement (SLA) agent to monitor network performance based
on configurable latency, jitter, and packet loss metrics as well as to query the results. You can
schedule measurements between the XSR and any remote host which supports the type of
operation - ICMP echo - used to perform the measurement.
There are two management interfaces which operators can choose from to perform monitoring:
CLI or SNMP. The SLA agent supported via the CLI is based on the de facto industry standard
whereas the supported MIB provided by the SNMP interface is based on the Enterasys-Service-
Level-Reporting-MIB (SLR). This MIB in turn is based on the IP Performance Monitoring Reporting
MIB, now in RFC draft form.
The SLR MIB classifies network performance by network and aggregate measurements as follows:
•Network measure - Performs several metric measurements per packet exchange: each
measurement step produces a single result per metric.
•Aggregate measure - Summarizes the results of previous network or aggregated
measurements.
For example, metrics such as packet loss and round-trip delay are classified as network
measurements while round-trip delay average and jitter metrics, which are calculated based on
previous results, are classified as aggregate measurements. This is described further in the
following sections.
For more inform ation on SLA-relat ed CLI commands, re fer to the XSR CLI Reference Guide. Refer
to Appendix: B “Service Level Reporting MIB Tables” on pageB-1 for a list of XSR-supported
fields and tables from the Enterasys Service Level Reporting MIB.

Measuring Performance Metrics

XSR performance metrics are measured as follows:
•D(i) - the value for the ith measurement
•Ri - receive time for the ith measurement
•Si - sending time for the ith measurement
Note: The SLA agent provides statistics based on round-trip measurements only and includes XSR
processing time.