SmartEdge 600 Router Hardware Guide
3.3 CLI Commands for Hardware Troubleshooting
Required characters and keywords for commands are shown in bold; arguments
for which you must supply a value are shown in italic.
Table 32 CLI Commands for Hardware Troubleshooting
Task or Information Needed CLI Command Comments
Clear counters for a port
clear port counters slot/port
The clear port counters command
does not disable the port; use the shutdown
command to disable the port.
Enable loopback on an ATM, an FE,
or a GE port
port port-type slot/port
loopback loopback-type
No loopback type is specified for FE and GE
ports.
Disable loopback on an ATM, an FE,
or a GE port
port port-type slot/port
noloopback
Table 33 Loopback Types
Loopback Type Description
–
No loopback type is specified for Ethernet and Gigabit Ethernet ports.
internal
(1)
Loops the transmit line to the receive line; ATM OC and POS ports.
line
Loops the receive line to the transmit line; ATM OC and POS ports.
(1) The internal keyword for all ports, except a port on a second-generation ATM OC card, causes all transmitted
traffic to be looped back and not sent to the remote site; instead, the remote site receives a LOS. For a port on a
second-generation ATM OC card, the port software injects an alarm indication signal-line (AIS-L), and then resumes
transmitting traffic.
3.4 Values for CLI Input Arguments
Values for input arguments that are shown in bold must be entered in the
specified format.
Table 34 Values for CLI Input Arguments
Argument Range of Values/Description Restrictions
loopback-type
See the table of loopback types and the ports to
which they apply.
port
1 to 26.
The Ethernet management port is always port
1 in slot 1.
port-type
• atm—ATM OC port.
• ethernet—FE or GE port (any version).
slot
1—Slot in which the Ethernet management port
is configured.
2—Slot for all native ports.
52 27/153 30-CRA 119 1170/1 Uen A | 2010-04-09
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