TEG1210P 10-Port Gigabit Intelligent PoE Switch User Guide
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2. SNMP Working Scheme
SNMP consists of NMS and Agent:
NMS
（
Network Management Station
）
is a workstation that runs client programs.
Agent is the server software that is run in network devices (such as a switch).
NMS sends GetRequest, GetNextRequest and SetRequest frames to Agent and the
agent, upon receiving the frames, according to frame types, performs Read or Write
operation on MIB and generates and returns Response frames to NMS.
3. Versions of SNMP
This switch is compatible with SNMP v1 and SNMP v2c and uses community name for
authentication, thus a SNMP frame with the community name that is not recognized by
the switch will be discarded. The community name defines the relationship between
SNMP NMS and SNMP Agent. It functions equivalently as a password that can restrict
SNMP NMS from accessing SNMP Agent in a switch.
4. Trap
Trap is the message that is actively sent by a managed device to NMS to report some
important and urgent events (such as the managed device is rebooted, etc).
¾
VLAN
1. Overview of VLAN
VLAN, virtual local network, can be used to logically instead of physically partition
network devices on a local network into several network segments so as to implement
virtual workgroup technology. It allows network administrators to logically partition a
physical LAN into various broadcast domains (namely, VLANs). Each VLAN consists of a
group of PCs with the same demands. Since VLAN is logically instead of physically
partitioned, PCs in the same VLAN do not need to be confined to the same physical
space; in other words, these PCs do not necessarily (don’t need to) belong to the same
physical LAN net segment.
2. Tag VLAN Port
After 802.1Q VLAN mode is enabled, all ports will have default VIDs, namely PVID,which
can only influence switch’s external actions but can not affect its internal forwarding rule
at all. For tagged frames matching the port’s PVID, any type of ports adopts the same
