Fast Ethernet interfaces on the VNswitch module are automatically enabled
when the module is installed. If you have previously disabled an interface, and need
to enable it, perform the following procedure.
By default, all Fast Ethernet interfaces on the module are enabled. You
might need to disable an interface, for example, if you want to logically disconnect a
portion of your network while making changes to the network segment's physical
environment.
The duplex mode is set automatically when the VNswitch module is installed
and the Fast Ethernet port is connected to the network. Automatic setting of the duplex
mode is a function of the auto-negotiation feature, which is enabled by default. If you do
not want to establish the duplex mode automatically through auto-negotiation, you can set
the duplex mode manually.
Typically, an interface is set for full-duplex mode if it is established
as a point-to-point connection to a single device, and for half-duplex if connected to a
shared medium supporting multiple devices.
Status |
Physical Address |
MAC address of the interface. |
PROM Address |
Permanent unique Ethernet address in the
programmable read-only memory (PROM) for this Fast Ethernet interface. |
Network Speed |
Maximum line speed supported by the
interface. |
Duplex Mode |
Currently selected duplex mode:
half-duplex or full-duplex. |
MAU Status |
Type |
Current operational type and mode of the
Medium Access Unit (MAU). Possible values are:
- 10Base-T full-duplex mode
- 10Base-T half-duplex mode
- 100Base-T full-duplex mode
- 100Base-T half-duplex mode
|
State |
Current operational state of the MAU
associated with the interface. Possible states are:
- Operational
- Not present
- Unknown
- Other
|
Media Avail.
State |
Status of the MAU's connection to the
physical medium. Possible states are:
- Available
- Not available
- Remote fault
- Unknown
- Other
|
Media Avail.
State Exits |
Number of times the MAU has been in the
media available state and then changed to another state. |
Connector |
Type of physical connector used by the MAU.
Possible connector types are RJ45 MMJs and fiber SC. |
Jabber State |
State to which the MAU transitions if it
transmits for an excessive period of time (26 milliseconds). While in jabber state, the
MAU disables any further transmission onto the medium until the interface stops
transmitting to the MAU for approximately 750 milliseconds. (Applicable to 10Base-T mode
only.) Possible states are:
|
Jabber State
Enters |
Number of times the MAU detected a jabber
condition. |
False Carrier |
The number of carrier sense is asserted
without a J/K symbol detection. |
Error Statistics: Input |
Oversized Frames |
Number of times the interface received a
frame that was larger than the maximum size of an Ethernet frame (1518 bytes). |
Alignment Error |
Number of alignment errors received on the
interface. |
Runts |
Number of runt packets (frames shorter than
64 bytes) received by the interface since the last restart. |
Internal H/W
Errors |
Number of internal hardware errors related
to packet reception that do not fall into any other category of counters listed in this
window. |
FCS Error |
Number of FCS errors received on the
interface. |
FIFO Overrun |
Number of times the Fast Ethernet chipset
is unable to store bytes in the local packet buffer as fast as they come off the wire. |
Missed Packets |
Number of times the interface attempted to
receive a packet, but the local packet buffer was full. This error indicates that
the network has more traffic than the interface can handle. |
Error Statistics: Output |
Deferred
Transmission |
Number of times the carrier sense mechanism
detects line activity causing the interface to defer transmission. |
Multiple
Collisions |
Number of packets involved in multiple
collisions before they are successfully transmitted. |
Excess
Collisions |
Number of packets for which transmission
fails due to 16 successive collisions on the interface. This error indicates a high
volume of network traffic or hardware problems with the network. |
Carrier Sense
Errors |
Number of times the carrier sense condition
was lost or never asserted when attempting to transmit a packet on the interface. This
error indicates a problem between the interface and its Fast Ethernet transceiver. |
Late Collisions |
Number of times that a collision is
detected later than 512 bit times into the transmission of a packet. This error
indicates that the interface failed to defer, or that the network is not configured
properly. |
Single
Collisions |
Number of packets that have experienced
exactly one collision and are then successfully transmitted. |
Total
Collisions |
Sum of single collisions plus multiple
collisions. |
FIFO Underrun |
Number of times a packet transmission fails
due to the inability of the interface to retrieve packets from the local packet buffer
fast enough to transmit them onto the network. |
SQE Test Error |
Number of times the interface sends a
packet but detects that the transceiver has no heartbeat. The packet is treated as
successfully transmitted because some transceivers do not generate heartbeats. |
Internal H/W
Errors |
Number of internal hardware errors related
to packet transmission that do not fall into any other category of counters listed in this
window. |
Fast Ethernet Interface Configuration |
Interface |
Specifies whether the interface is enabled
or disabled. |
Default Duplex
Mode |
Specifies the current duplex mode
configured on the interface. |