System information

Troubleshooting Serial Line Problems 15-339
show interfaces serial
show interfaces serial
To display information about a serial interface, use the show interfaces serial privileged exec
command:
show interfaces serial [number] [accounting]
show interfaces serial [number [:channel-group] [accounting] (Cisco 4000 series)
show interfaces serial [slot | port [:channel-group]] [accounting] (Cisco 7500 series)
show interfaces serial [type slot | port-adapter | port] [serial] (ports on VIP cards in the
Cisco 7500 series)
show interfaces serial [type slot | port-adapter | port][:t1-channel][accounting | crb] (CT3IP in
Cisco 7500 series)
Syntax Description
• number—(Optional) Port number.
• accounting—(Optional) Displays the number of packets of each protocol type that have been
sent through the interface.
• :channel-group—(Optional) On the Cisco 4000 series with an NPM or a Cisco 7500 series with
a MIP, specifies the T1 channel-group number in the range of 0 to 23, defined with the
channel-group controller configuration command.
• slot—Refers to the appropriate hardware manual for slot information.
• port—Refers to the appropriate hardware manual for port information.
• port-adapter—Refers to the appropriate hardware manual for information about port adapter
compatibility.
• :t1-channel—(Optional) For the CT3IP, the T1 channel is a number between 1 and 28.
T1 channels on the CT3IP are numbered 1 to 28 rather than the more traditional zero-based
scheme (0 to 27) used with other Cisco products. This is to ensure consistency with telco
numbering schemes for T1 channels within channelized T3 equipment.
• crb—(Optional) Shows interface routing and bridging information.
Command Mode
Privileged exec
Usage Guidelines
This command first appeared in Cisco IOS Release 10.0 for the Cisco 4000 series. It first appeared
in Cisco IOS Release 11.0 for the Cisco 7000 series, and it was modified in Cisco IOS Release 11.3
to include the CT3IP.