30
Figure 4-15 Filter port MAC
Step 3
Click
Add
, and then enter the MAC address that needs to be filtered in
Add MAC Allowlist
window.
Step 4
Click
Save
.
5.5 Configuring SNMP
SNMP network includes two elements: NMS and Agent.
●
NMS (Network Management System) is the SNMP network administrator and provides user-
friendly interactive interface, which is suitable for the network administrator to complete the
most management work.
●
Agent is the object to be managed in the SNMP network, and receives, processes the NMS query
message. In some urgent situation such as when the port status has changed, Agent can
automatically send out the alarm information to the NMS.
5.5.1 SNMP Protocol Version
The Agent supports SNMPv1, SNMPv2 and SNMPv3.
●
SNMPv1 adopts community name to certify. The community name is like a password to restrict
the communication between the NMS and Agent. If the NMS community name and the managed
Switch community name are not the same, then the NMS and the Agent cannot establish the
SNMP connection, which means that the NMS cannot access the Agent and the NMS will discard
the warning information from the Agent.
●
SNMPv2 adopts the community name to certify. SNMPv2c expands the functions of the SNMPv1,
provided more operation types, supports more data types and provides more error codes.
Therefore, the errors can be accurately distinguished.
●
SNMPv3 adopts User-Based Security Model (USM) to certify. The network administrator can set
the authentication and encryption function. The authentication is to check the validity of the
message sender and to avoid the illegal access. The encryption is to encrypt the communication
messages between the NMS and the Agent in case there is eavesdrop. The authentication and
