Chassis Member - Juniper JUNOS OS 10.3 - SOFTWARE Manual

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load-balancing traffic across all available links. If one of the links fails, the system
automatically load-balances traffic across all remaining links.
You can select up to four uplink module ports or SFP network ports on an EX4200-24F
switch that have been configured as Virtual Chassis ports (VCPs) to form a LAG. When
you set uplink module ports or SFP network ports on Virtual Chassis member switches
as uplink VCPs, connect at least two of those uplink VCPs on one member to at least
two uplink VCPs on another member, and configure those uplink VCPs to operate at the
same link speed, the uplink VCPs automatically form a LAG and each LAG is assigned a
positive-integer identifier called a trunk ID.
A LAG over uplink VCPs provides higher overall bandwidth for forwarding traffic between
the member switches connected by the uplink VCPs, faster management communications,
and greater redundancy of operations among the members than would be available
without the LAG. All Juniper Networks EX4200 Ethernet Switches have two dedicated
VCPs. A LAG over uplink VCPs provides an additional Virtual Chassis link throughput of
20 Gbps for the EX4200-24P, EX4200-24T, EX4200-48P, and EX4200-48T models
and additional throughput of 28 Gbps for the EX4200-24F model. Up to eight Virtual
Chassis LAGs can be created per member.
See "Setting an Uplink Module Port as a Virtual Chassis Port (CLI Procedure)" on page 1023
for information about configuring uplink module ports and SFP network ports on
EX4200-24F switches as uplink VCPs.
To verify that the LAG has been created, view the output of the command
.
virtual-chassis vc-port
NOTE: The interfaces that are included within a bundle or LAG are sometimes
referred to as member interfaces. Do not confuse this term with member
switches, which refers to EX4200 switches that are interconnected as a
Virtual Chassis. It is possible to create a LAG that is composed of member
interfaces that are located in different member switches of a Virtual Chassis.
Virtual Chassis Overview on page 921
Understanding Aggregated Ethernet Interfaces and LACP on page 1099
Example: Configuring Aggregated Ethernet High-Speed Uplinks Between a Virtual
Chassis Access Switch and a Virtual Chassis Distribution Switch on page 970
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: Configuring a Virtual Chassis Interconnected Across Multiple Wiring Closets
on page 963
Example: Configuring Link Aggregation Groups Using Uplink Virtual Chassis Ports on
page 999
Chapter 43: Virtual Chassis—Overview, Components, and Configurations
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