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JUNOS 10.1 Network Interfaces Configuration Guide
Figure 55: Remote and Local E3 Loopback
To configure loopback capability on an E3 interface, include the
at the
Packets can be looped on either the local router or the remote CSU.
To exchange BERT patterns between a local router and a remote router, include the
loopback remote
link. From the local router, you issue the
For more information about configuring BERT, see "Interface Diagnostics" on page 146.
For more information about using operational mode commands to test interfaces,
see the JUNOS System Basics and Services Command Reference.
To turn off the loopback capability, remove the
configuration:
You can determine whether there is an internal problem or an external problem by
checking the error counters in the output of the
command:
Example: Configuring E3 Loopback Capability
To determine whether a problem is internal or external, loop packets on both the
local and the remote router. To do this, include the
cisco-hdlc
loopback local
level. With this configuration, the link stays up, so you can loop ping packets to a
remote router. The
PIC just before the data reaches the transceiver.
574
Configuring E3 Loopback Capability
[edit interfaces interface-name e3-options]
[edit interfaces interface-name e3-options]
loopback (local | remote);
statement in the interface configuration at the remote end of the
[edit]
user@host# delete interfaces e3-fpc/pic/port e3-options loopback
user@host> show interfaces interface-name extensive
statements at the
statement at the
loopback local
[edit interfaces]
e3-1/0/0 {
no-keepalives;
encapsulation cisco-hdlc;
hierarchy level:
test interface
loopback
show interface interface-name extensive
no-keepalives
[edit interfaces interface-name]
[edit interfaces interface-name e3-options]
statement causes the interface to loop within the
statement
loopback
command.
statement from the
and
encapsulation
hierarchy level and the
hierarchy
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