Juniper JUNOS OS 10.3 - SOFTWARE Manual page 1073

Troubleshooting
Problem
Solution
Related
Documentation
Example: Configuring Aggregated Ethernet High-Speed Uplinks with LACP Between
a Virtual Chassis Access Switch and a Virtual Chassis Distribution Switch
Copyright © 2010, Juniper Networks, Inc.
Troubleshooting a LAG That Is Down
The show interfaces terse
Check the following:
Verify that there is no configuration mismatch.
Verify that all member ports are up.
Verify that a LAG is part of family ethernet switching (Layer 2 LAG) or family inet (Layer
3 LAG).
Verify that the LAG member is connected to the correct LAG at the other end.
Verify that the LAG members belong to the same switch (or the same Virtual Chassis).
Example: Configuring a Virtual Chassis with a Master and Backup in a Single Wiring
Closet on page 947
Example: Configuring Aggregated Ethernet High-Speed Uplinks with LACP Between
a Virtual Chassis Access Switch and a Virtual Chassis Distribution Switch on page 977
Example: Connecting an Access Switch to a Distribution Switch on page 1320.
Virtual Chassis Cabling Configuration Examples for EX4200 Switches
Installing an Uplink Module in an EX3200 or EX4200 Switch
EX Series switches allow you to combine multiple Ethernet links into one logical interface
for higher bandwidth and redundancy. The ports that are combined in this manner are
referred to as a link aggregation group (LAG) or bundle. The number of Ethernet links
you can combine into a LAG depends on your EX Series switch model. See "Understanding
Aggregated Ethernet Interfaces and LACP" on page 1099 for more information. EX Series
switches allow you to further enhance these links by configuring Link Aggregation Control
Protocol (LACP).
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 978
Overview and Topology on page 978
Configuring LACP for the LAGs on the Virtual Chassis Access Switch on page 978
Configuring LACP for the LAGs on the Virtual Chassis Distribution Switch on page 979
Chapter 44: Virtual Chassis—Configuration Examples
command shows that the LAG is down:
977