3Com 3C17705, Руководство пользователя

Страница: 114 / 184

114 C
HAPTER
8: S
TATUS
M
ONITORING AND
S
TATISTICS
Port Errors
The switch keeps track of errors for each port.
To view port transmit errors, use the following command:
show ports <portlist> txerrors
The following port transmit error information is collected by the system:
■
Link Status — The current status of the link. Options are
■
Ready (the port is ready to accept a link)
■
Active (the link is present at this port)
■
Transmit Collisions (TX Coll) — The total number of collisions seen
by the port, regardless of whether a device connected to the port
participated in any of the collisions.
■
Transmit Late Collisions (TX Late) — The total number of collisions
that have occurred after the port’s transmit window has expired.
■
Transmit Deferred Frames (TX Def) — The total number of frames
that were transmitted by the port after the first transmission attempt
was deferred by other network traffic.
■
Transmit Errored Frames (TX Err) — The total number of frames
that were not completely transmitted by the port because of network
errors (such as late collisions or excessive collisions).
To view port receive errors, use the following command:
show ports <portlist> rxerrors
The following port receive error information is collected by the switch:
■
Receive Bad CRC Frames (RX CRC) — The total number of frames
received by the port that were of the correct length, but contained a
bad FCS value.
■
Receive Oversize Frames (RX Over) — The total number of good
frames received by the port that were of greater than the supported
maximum length of 1,522 bytes.
■
Receive Undersize Frames (RX Under) — The total number of
frames received by the port that were less than 64 bytes long.
■
Receive Jabber Frames (RX Jab) — The total number of frames
received by the port that was of greater than the support maximum
length and had a Cyclic Redundancy Check (CRC) error.