Juniper JUNOS OS 10.3 - SOFTWARE Manual page 1218

Complete Software Guide for Junos
Requirements
Overview and Topology
1122
®
OS for EX Series Ethernet Switches, Release 10.3
This example describes how to overlay LACP on the LAG configurations that were created
in "Example: Configuring Aggregated Ethernet High-Speed Uplinks Between a Virtual
Chassis Access Switch and a Virtual Chassis Distribution Switch" on page 970:
Requirements on page 1122
Overview and Topology on page 1122
Configuring LACP for the LAGs on the Virtual Chassis Access Switch on page 1123
Configuring LACP for the LAGs on the Virtual Chassis Distribution Switch on page 1123
Verification on page 1124
Troubleshooting on page 1125
This example uses the following software and hardware components:
Junos OS Release 9.0 or later for EX Series switches
Two EX4200-48P switches
Two EX4200-24F switches
Four EX Series XFP uplink modules
Before you configure LACP, be sure you have:
Set up the Virtual Chassis switches. See "Example: Configuring a Virtual Chassis with
a Master and Backup in a Single Wiring Closet" on page 947.
Configured the uplink ports on the switches as trunk ports. See "Configuring Gigabit
Ethernet Interfaces (CLI Procedure)" on page 1153.
Configured the LAGs. See "Example: Configuring Aggregated Ethernet High-Speed
Uplinks Between a Virtual Chassis Access Switch and a Virtual Chassis Distribution
Switch" on page 970
This example assumes that you are already familiar with the Example: Configuring
Aggregated Ethernet High-Speed Uplinks between Virtual Chassis Access Switch and
Virtual Chassis Distribution Switch. The topology in this example is exactly the same as
the topology in that other example. This example shows how to use LACP to enhance
the LAG functionality.
LACP exchanges are made between actors (the transmitting link) and partners (the
receiving link). The LACP mode can be either active or passive.
NOTE: If the actor and partner are both in passive mode, they do not exchange
LACP packets, which results in the aggregated Ethernet links not coming up.
By default, LACP is in passive mode. To initiate transmission of LACP packets
and responses to LACP packets, you must enable LACP in active mode.
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