30
Figure 3-22: SNMP Configuration Page
SNMP:
Used to Enable or Disable SNMP. The default is Enable.
Get/Set/Trap Community:
The community name is used as password for authentication. The switch will
only communicate with the SNMP manager if the community strings are the same. Community name is
user-definable with a maximum length of 15 characters and is case sensitive. Any characters other than
spaces are allowed.
Each function has its own community name. For example, the community name for GET only works for
GET functions and can’t be applied to other functions such as SET and Trap.
Set Community can be set to Disable to disallow setting of any switch settings by the SNMP management
software. The default is Enable.
Default community name for GET: public
Default community name for SET: private
Default community name for Trap: public
Default trap host IP address: 0.0.0.0
Default port number: 162
Trap:
The switch supports up to 6 trap hosts, each of them having its own community name, IP address
and port. Each host must be running an SNMP management software capable of receiving standard
SNMP traps. For each public trap, the switch supports the following trap events: Cold Start, Warm Start,
Link Down, Link Up and Authentication Failure Traps. They can be enabled or disabled individually. When
enabled, the corresponding trap will send a trap message to the trap host when a trap event occurs. If all
public traps are disabled, no public trap message will be sent. The Enterprise trap (number 6) is classified
as a private trap, and is listed in the Trap Alarm Configuration folder. The default for all public traps is
Enable.
3.7 IGMP
Snooping
The IGMP Snooping page (Figure 3-23) is used to establish the multicast groups to forward multicast
packets to, thereby avoiding wasting the bandwidth while IP multicast packets are running over the
network. Switches that do not support IGMP or IGMP Snooping cannot tell the difference between a
multicast packet from the broadcast packet, so it can only treat them all as the broadcast packets. Without
