#
interface GigabitEthernet1/0/12
port link-type hybrid
undo port hybrid vlan 1
port hybrid vlan 49 untagged
port hybrid pvid vlan 49
voice-vlan 5 enable
stp edged-port
lldp compliance admin-status cdp txrx
poe enable
poe legacy enable
loopback-detection enable vlan 1 to 4094
#
#
interface GigabitEthernet2/0/47
port link-type hybrid
undo port hybrid vlan 1
port hybrid vlan 5 tagged
port hybrid vlan 49 untagged
port hybrid pvid vlan 49
stp edged-port
lldp compliance admin-status cdp txrx
poe enable
poe legacy enable
loopback-detection action block
#
Loop Protection
Architecture anti-loop
Self-device access loop prevention
SNMP
SNMP
SNMPv2
SNMPv3
V3 data messages are transmitted in ciphertext, and their actual content cannot be seen through packet capture tools such as wireshark/tcpdump
SNMP
poll
UDP Port 161
trap
UDP Port 162
SNMPv1-3
community
RO
public (read-only)
It means that the management terminal has read permission to the device, no write permission, and can only monitor the running status of the system
RW
private(read-write)
The management terminal is readable and writable to the device, which can monitor and perform operations such as modifying the configuration and changing the interface status
The community name must be the same, and the SNMP communication between the management device and the device can be carried out
NMS to Device example SolarWinds send 161 to switch
Device to NMS example switch send 162 to SolarWinds
