Concept Guide

Status Denition
OK Status:
Terminated
TDR test is complete, no fault is detected on the cable, and the test is terminated.
Length: 92 (+/- 1)
meters, Status:
Shorted
A short is detected on the cable. The location, in this Example is 92 meters. The short is
accurate to plus or minus one meter.
Length: 93 (+/- 1)
meters, Status:
Open
An opening is detected on the cable. The location, in this Example is 93 meters. The open
is accurate to plus or minus one meter.
Status: Impedance
Mismatch
There is an impedance mismatch in the cables.
Example
Related Commands tdr-cable-test — Runs the TDR test.
Enhanced Validation of Interface Ranges
You can avoid specifying spaces between the range of interfaces, separated by commas, that you congure by using the interface
range
command. For example, if you enter a list of interface ranges, such as interface range fo 2/0-1,te 10/0,fa 0/0, this
conguration is considered valid. The comma-separated list is not required to be separated by spaces in between the ranges. You can
associate multicast MAC or hardware addresses to an interface range and VLANs by using the mac-address-table static
multicast-mac-address vlan vlan-id output-range interface command.
UDP Broadcast
The user datagram protocol (UDP) broadcast feature is a software-based method to forward low throughput (not to exceed 200 pps)
IP/UDP broadcast trac arriving on a physical or VLAN interface.
Important Points to Remember
• Routing information protocol (RIP) is not supported with the UDP Broadcast feature.
• If you congure this feature on an interface using the ip udp-helper udp-port command, the ip directed-broadcast
command becomes ineective on that interface.
• The existing show interface command has been modied to display the congured broadcast address.
debug ip udp-helper
Enable UDP debug and display the debug information on a console.
Syntax
debug ip udp-helper
To disable debug information, use the no debug ip udp-helper command.
Defaults Debug disabled.
Command Modes
• EXEC
Interfaces 587