Junos® OS Ethernet Interfaces Configuration ... - Juniper Networks

Configuring Ethernet Loopback Capability
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By default, local aggregated Ethernet, Fast Ethernet, Tri-Rate Ethernet copper, Gigabit
Ethernet, and 10-Gigabit Ethernet interfaces connect to a remote system. To place an
interface in loopback mode, include the loopback statement:
loopback;
NOTE: If you configure a local loopback on a 1-port 10-Gigabit IQ2 and IQ2-E
PIC using the loopback statement at the [edit interfaces interface-name
gigether-options] hierarchy level, the transmit-path stops working, causing
the remote end to detect a link down.
To return to the default—that is, to disable loopback mode—delete the loopback
statement from the configuration:
[edit]
user@host# delete interfaces fe-fpc/pic/port fastether-options loopback
To explicitly disable loopback mode, include the no-loopback statement:
no-loopback;
You can include the loopback and no-loopback statements at the following hierarchy
levels:
Configuring Flow Control
Copyright © 2012, Juniper Networks, Inc.
• [edit interfaces interface-name aggregated-ether-options]
• [edit interfaces interface-name ether-options]
• [edit interfaces interface-name fastether-options]
• [edit interfaces interface-name gigether-options]
•
loopback on page 506
• Ethernet Interfaces Overview on page 35
• Junos® OS Ethernet Interfaces
By default, the router or switch imposes flow control to regulate the amount of traffic
sent out on a Fast Ethernet, Tri-Rate Ethernet copper, Gigabit Ethernet, and 10-Gigabit
Ethernet interface. Flow control is not supported on the 4-port Fast Ethernet PIC. This is
useful if the remote side of the connection is a Fast Ethernet or Gigabit Ethernet switch.
You can disable flow control if you want the router or switch to permit unrestricted traffic.
To disable flow control, include the no-flow-control statement:
no-flow-control;
Chapter 2: Configuring Ethernet Interfaces
45