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If the network layer protocol state of an interface is shown as UP, but its link is
an on-demand link or not present at all, its protocol attribute includes the
spoofing flag (an s in parentheses). This attribute is typical of interface Null 0
and the loopback interfaces.
Physical link state of the interface:
UP—Link is up.
DOWN—Link is down physically.
ADM—Link has been shut down administratively. To recover its physical
state, perform the undo shutdown command.
Stby—Interface is a standby interface.
Protocol connection state of the interface, which can be UP, DOWN, or UP(s).
The brief information of
interfaces under bridge
mode:
Brief information about Layer 2 interfaces.
Speed or Duplex: (a)/A -
auto; H - half; F - full
If the speed of an interface is negotiated automatically, its speed attribute
includes the auto negotiation flag, letter a in parentheses.
If the duplex mode of an interface is negotiated automatically, its duplex mode
attribute includes the following options:
(a)/A—Auto negotiation
H—Half negotiation
F—Full negotiation
Type: A - access; T - trunk;
H – hybrid
Link type options for Ethernet interfaces.
Duplex mode of the interface:
A—Auto-negotiation
F—Full duplex
F(a)—Auto-negotiated full duplex
H—Half duplex
H(a)—Auto-negotiated half duplex
Link type of the interface:
A—Access
H—Hybrid
T—Trunk
Port VLAN ID of the interface.
Causes for the physical state of an interface to be DOWN. For more
information, see Table 7.
Table 7 Causes for the physical state of an interface to be DOWN
No physical connection exists (possibly because the network cable is
disconnected or faulty).
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