Cisco Catalyst 2950 Command Reference

2-289
Catalyst 2950 and Catalyst 2955 Switch Command Reference
0L-10102-01
Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands
show controllers ethernet-controller
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
1
BPDUs
2
.
VLAN discard frames The number of frames dropped on an interface because the CFI
3
bit is set.
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 Description
Bytes The total amount of memory (in bytes) used by frames received on an interface, including the
FCS
1
value and the incorrectly formed frames. This value excludes the frame header bits.
Frames The total number of frames received on an interface, including multicast frames, broadcast
frames, and incorrectly formed frames.
FCS errors The total number of frames received on an interface that have a valid length (in bytes) but do not
have the correct FCS values.
Multicast frames The total number of frames successfully received on the interface that are directed to multicast
addresses.
Broadcast frames The total number of frames successfully received on an interface that are directed to broadcast
addresses.
Control frames The number of control frames received on an interface, such as STP BPDUs.
Pause frames The number of pause frames received on an interface.
Unknown opcode frames The number of frames received with an unknown operation code.
Alignment errors The total number of frames received on an interface that have alignment errors.
Length out of range The number of frames received on an interface that have an out-of-range length.
Symbol error frames The number of frames received on an interface that have symbol errors.
False carrier errors The number of occurrences in which the interface detects a false carrier when frames are not sent
or received.
Valid frames, too small 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.
Valid frames, too large The number of frames received on an interface that are larger than the maximum allowed frame
size.
Invalid frames, too small 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.
Table 2-9 Transmit Field Descriptions (continued)
Field Description

Cisco Catalyst 2950 Specifications

General

Forwarding Bandwidth	8.8 Gbps
Switching Capacity	13.6 Gbps
Forwarding Rate	6.6 Mpps
Weight	3.6 kg
RAM	16 MB
Flash Memory	8 MB
Operating Humidity	10% to 85% non-condensing
Uplink Ports	2 x 10/100/1000Base-T
Dimensions	4.4 cm x 44.5 cm x 24.2 cm
Remote Management Protocol	SNMP, Telnet, HTTP
Features	Quality of Service (QoS), VLAN support
Compliant Standards	IEEE 802.3, IEEE 802.3u, IEEE 802.1D, IEEE 802.1Q, IEEE 802.1p
Status Indicators	system
Operating Temperature	0 to 45°C
Ports	24 x 10/100 Ethernet ports
MAC Address Table Size	8, 192 entries
Power Supply	Internal 100-240V AC, 50-60Hz