show ports collisions

show ports {mgmt | port_list |tag tag} collisions {no-refresh | refresh }


Displays real-time collision statistics.

Syntax Description


Specifies the management port.


Specifies one or more ports or slots and ports.


Specifies an 802.1Q or 802.1ad tag value.


Specifies a static snapshot of data.

refresh Continuous refresh of output.


Real-time statistics.

Usage Guidelines

If you do not specify a port number, range of ports, or tag value, statistics are displayed for all ports. To clear the counters, use the clear counters ports command. The default display is a constantly refreshing real-time display. If you specify the no-refresh parameter, the system displays a snapshot of the data at the time you issue the command.

The tag value may be associated with either a VMAN or a VLAN.

This status information may be useful for your technical support representative if you have a network problem.


The following command displays real-time collision statistics on ports 1 and 2 on a switch:

show ports 1-2 collisions

Following is sample output from this command:

Port Collision Monitor
Port        Link           Collision Histogram
State 1   2   3   4   5   6   7   8   9  10  11  12  13  14  15  16
1     A      0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0
2     R      0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0
Link State: A-Active R-Ready, NP-Port not present, L-Loopback

The numbers 1 to 16 represent the number of collisions encountered prior to successfully transmitting the packet; this is applicable only for half-duplex links.


This command was first available in ExtremeXOS 10.1.

The no-refresh variable was added in ExtremeXOS 11.3.

The tag value was added in ExtremeXOS 12.4.4.

The refresh keyword was added in ExtremeXOS 16.1.

Platform Availability

This command is available on ExtremeSwitching X435, X440-G2, X450-G2, X460-G2, X465, X590, X620, and X695 series switches.