Cisco Catalyst 2950 Command Reference Manual page 317

Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands
Table 2-9 Transmit Field Descriptions (continued)
Field Description
Excessive collisions The number of frames that could not be sent on an interface because more than 16 collisions
occurred.
Total collisions The total number of collisions on an interface.
Control frames The number of control frames sent on an interface, such as STP
VLAN discard frames The number of frames dropped on an interface because the CFI
Too old frames The number of frames dropped on the egress port because the packet aged out.
Tagged frames The number of tagged frames sent on an interface.
Aborted Tx frames The number of aborted transmission attempts on the interface.
1. STP = Spanning Tree Protocol
2. BPDU = bridge protocol data unit
3. CFI = Canonical Format Indicator
Table 2-10 Receive Field Descriptions
Field
Bytes
Frames
FCS errors
Multicast frames
Broadcast frames
Control frames
Pause frames
Unknown opcode frames
Alignment errors
Length out of range
Symbol error frames
False carrier errors
Valid frames, too small
Valid frames, too large
Invalid frames, too small
0L-10102-01
Description
The total amount of memory (in bytes) used by frames received on an interface, including the
1
FCS value and the incorrectly formed frames. This value excludes the frame header bits.
The total number of frames received on an interface, including multicast frames, broadcast
frames, and incorrectly formed frames.
The total number of frames received on an interface that have a valid length (in bytes) but do not
have the correct FCS values.
The total number of frames successfully received on the interface that are directed to multicast
addresses.
The total number of frames successfully received on an interface that are directed to broadcast
addresses.
The number of control frames received on an interface, such as STP BPDUs.
The number of pause frames received on an interface.
The number of frames received with an unknown operation code.
The total number of frames received on an interface that have alignment errors.
The number of frames received on an interface that have an out-of-range length.
The number of frames received on an interface that have symbol errors.
The number of occurrences in which the interface detects a false carrier when frames are not sent
or received.
The number of frames received on an interface that are smaller than 64 bytes (or 68 bytes for
VLAN-tagged frames) and have valid FCS values. The frame size includes the FCS bits but
excludes the frame header bits.
The number of frames received on an interface that are larger than the maximum allowed frame
size.
The number of frames received that are smaller than 64 bytes (including the FCS bits and
excluding the frame header) and that have either an FCS error or an alignment error.
1
BPDUs
3
bit is set.
Catalyst 2950 and Catalyst 2955 Switch Command Reference
show controllers ethernet-controller
2
.
2-289