Technical Documentation



path-trace trace-string;

Hierarchy Level

[edit interfaces interface-name sonet-options]

Release Information

Statement introduced before JUNOS Release 7.4.


For SONET/SDH interfaces and 10-Gigabit Ethernet interfaces in WAN PHY mode, configure a path trace identifier, which is a text string that identifies the circuit.

On SONET/SDH OC48 interfaces that are configured for channelized (multiplexed) mode (by including the no-concatenate statement at the [edit chassis fpc slot-number pic pic-number] hierarchy level), the bytes e1-quiet and bytes f1 options have no effect. The bytes f2, bytes z3, bytes z4, and path-trace options work correctly on channel 0 and work in the transmit direction only on channels 1, 2, and 3.

For DS3 channels on a channelized OC12 interface, you can configure a unique path trace for each of the 12 channels. Each path trace can be up to 16 bytes. For channels on a channelized OC12 IQ interface, each path trace can be up to 64 bytes.


trace-string—Text string that identifies the circuit. If the string contains spaces, enclose it in quotation marks. A common convention is to use the circuit identifier as the path trace identifier. If you do not configure an identifier, the JUNOS Software uses the system and interface names to construct the default trace-string. For all nonchannelized SONET/SDH interfaces, the default trace-string is system-name interface-name. For channelized SONET/SDH interfaces and 10–Gigabit Ethernet WAN-PHY interfaces, the default trace-string is interface-name.

Required Privilege Level

interface—To view this statement in the configuration.

interface-control—To add this statement to the configuration.

Published: 2010-04-20