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Community name is used as password for authenticating if the requesting network management unit
belongs to the same community group. If they both don’t have the same community name, they don’t
belong to the same group. Hence, the requesting network management unit can not access the device
with different community name via SNMP protocol; If they both have the same community name, they
can talk each other.
Community name is user-definable with a maximum length of 15 characters and is case sensitive.
There is not allowed to put any blank in the community name string. Any printable character is
allowable.
The community name for each function works independently. Each function has its own community
name. Say, the community name for GET only works for GET function and can’t be applied to other
function such as SET and Trap.
y
Default SNMP function : Enable
y
Default community name for GET: public
y
Default community name for SET: private
y
Default community name for Trap: public
y
Default Set function : Enable
y
Default trap host IP address: 0.0.0.0
y
Default port number :162
y
Trap:
In the switch, there are four trap hosts supported. Each of them has its own community name and IP
address; is user-definable. To set up a trap host means to create a trap manager by assigning an IP
address to host the trap message. In other words, the trap host is a network management unit with
SNMP manager receiving the trap message from the managed switch with SNMP agent issuing the
trap message. 6 trap hosts can prevent the important trap message from losing.
For each public trap, the switch supports the trap event Cold Start, Warm Start, Link Down, Link Up
and Authentication Failure Trap. They can be enabled or disabled individually. When enabled, the
corresponded trap will actively send a trap message to the trap host when a trap happens. If all public
traps are disabled, no public trap message will be sent. As to the Enterprise (no. 6) trap is classified as
private trap, which are listed in the Trap Alarm Configuration function folder.
Default for all public traps: Enable.
3.6 Loop Detection
Looping will always occur when the switches are connected as a cycle and a switch transmits the packets that
will go back to the transmitted switch. Loop Detection will prevent the looping from happening. Moreover, it
could remove the looping phenomenon per port. In general, you can unplug the cable connection to stop the
looping when a port causes the looping. The switch has powerful Looping Detection capability, which could
cease the looping immediately.
