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Table 4 Description on the possible physical states of a Ethernet interface
Field Description
UP
The interface is physically up.
DOWN
The interface is physically down, because no physical connection exists.
Possible reason: The network cable is disconnected or faulty.
DOWN ( Administratively )
The interface is physically down, because it was shut down with the
shutdown
command. To restore its physical state, use the
undo
shutdown
command.
DOWN ( Link-Aggregation
interface down )
The interface is physically down, because the aggregate interface
corresponding to the aggregation group to which it belongs was shut down
with the
shutdown
command.
DOWN ( OAM connection
failure )
The interface is physically down, because an OAM connection fails to be
established on it or the OAM connection is disconnected.
DOWN ( DLDP connection
failure )
The interface is physically down, because a DLDP connection fails to be
established on it or the DLDP connection is disconnected.
DOWN ( Loopback
detection-protected )
The interface is shut down, because a loop is detected on it.
DOWN ( BPDU-protected )
The interface is shut down by the BPDU guard function.
DOWN ( Monitor-Link uplink
down )
The interface is physically down, because the uplink of the monitor link
group to which it belongs is down.
# Display brief information about all interfaces.
<Sysname> display interface brief
The brief information of interface(s) under route mode:
Link: ADM - administratively down; Stby - standby
Protocol: (s) - spoofing
Interface Link Protocol Main IP Description
NULL0 UP UP(s) --
Vlan1 UP UP 192.168.0.85
Vlan2 DOWN DOWN --
Vlan1010 DOWN DOWN --
The brief information of interface(s) under bridge mode:
Link: ADM - administratively down; Stby - standby
Speed or Duplex: (a)/A - auto; H - half; F - full
Type: A - access; T - trunk; H - hybrid
Interface Link Speed Duplex Type PVID Description
BAGG1 DOWN auto A A 1
Eth1/0/1 DOWN auto A A 1
Eth1/0/2 DOWN auto A A 1
Eth1/0/3 DOWN auto A A 1
Eth1/0/4 DOWN auto A A 1
Eth1/0/5 DOWN auto A A 1
Eth1/0/6 DOWN auto A A 1
Eth1/0/7 DOWN auto A A 1
Eth1/0/8 DOWN auto A A 1