Linksys EG24M User Guide - Page 42

Linksys EtherFast® II Series • Warm start • Cold start • Link up • Link down • Authentication failure • Rising alarm • Falling alarm • Topology change MIB-2 defines a set of manageable objects in various layers of the TCP/IP protocol suites. MIB-2 covers all manageable objects from layer 1 to layer 4 and, as a result, is the major SNMP MIB supported by all vendors in the networking industry. The GigaSwitch supports a complete implementation of SNMP Agent and MIB-2. RMON MIB (RFC 1757) and Bridge MIB (RFC 1493) The GigaSwitch provides hardware-based RMON counters in the switch chipset. The switch manager CPU polls these counters periodically to collect the statistics in a format that complies with the RMON MIB definition. RMON GROUPS SUPPORTED The GigaSwitch supports the following RMON MIB groups defined in RFC1757: • RMON Statistics Group maintains utilization and error statistics for the switch port being monitored. • RMON History Group gathers and stores periodic statistical samples from the previous Statistics Group. • RMON Alarm Group allows a network administrator to define alarm thresholds for any MIB variable. An alarm can be associated with Low Threshold, High Threshold, or both. A trigger can trigger an alarm when the value of a specific MIB variable exceeds a threshold, falls below a threshold, or exceeds or falls below a threshold. • RMON Event Group allows a network administrator to define actions based on alarms. SNMP Traps are generated when RMON Alarms are triggered. The action taken in the Network Management Station depends on the specific network management application. 76 10/100 Managed 24-Port GigaSwitch BRIDGE GROUPS SUPPORTED The GigaSwitch supports the following four groups of Bridge MIB (RFC1493): • The dot1dBase Group a mandatory group that contains the objects appli- cable to all types of bridges. • The dot1dStp Group contains the objects that denote the bridge's state, with respect to the Spanning Tree Protocol. If a node does not implement the Spanning Tree Protocol, this group will not be implemented. This group is applicable to any transparent only, source route, or SRT bridge that implements the Spanning Tree Protocol. • The dot1dTp Group contains objects that describe the entity's transparent bridging status. This group is applicable to transparent operation only and SRT bridges. • The dot1dStatic Group contains objects that describe the entity's destination-address filtering status. This group is applicable to any type of bridge which performs destination-address filtering. 77