User guide

S
UMMIT
S
WITCH
I
NSTALLATION AND
U
SER
G
UIDE
12-9
P
ORT
M
ONITORING
D
ISPLAY
K
EYS
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.
• Receive Alignment Errors (RX Align) — The total number of frames received by the
port that occurs if a frame has a CRC error and does not contain an integral number
of octets.
• Receive Frames Lost (RX Lost) — The total number of frames received by the port
that were lost because of buffer overflow in the switch.
P
ORT
M
ONITORING
D
ISPLAY
K
EYS
Table 12- 2 describes the keys used to control the displays that appear when you issue
any of the
show port
commands.
Table 12-2:
Port Monitoring Display Keys
Key(s) Description
U Displays the previous page of ports.
D Displays the next page of ports.
[Esc] or [Return] Exits from the screen.
0 Clears all counters.
[Space] Cycles through the following screens:
■
Packets per second
■
Bytes per second
■
Percentage of bandwidth
Available using the
show port
utilization
command only.
Summit.bk : 12STATUS.FM Page 9 Thursday, June 18, 1998 9:27 AM