Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual page 1007

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Chapter 37: EX4200 Virtual Chassis—Overview, Components, and Configurations
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 EX4200 Switch Uplink Module Port as a Virtual Chassis Port (CLI
Procedure)" on page 994 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.
EX4200 Virtual Chassis Overview on page 891
Understanding Aggregated Ethernet Interfaces and LACP on page 1244
Example: Configuring Aggregated Ethernet High-Speed Uplinks Between an EX4200
Virtual Chassis Access Switch and an EX4200 Virtual Chassis Distribution Switch on
page 940
Example: Configuring Aggregated Ethernet High-Speed Uplinks with LACP Between
an EX4200 Virtual Chassis Access Switch and an EX4200 Virtual Chassis Distribution
Switch on page 947
Example: Configuring an EX4200 Virtual Chassis Interconnected Across Multiple Wiring
Closets on page 932
Example: Configuring Link Aggregation Groups Using EX4200 Uplink Virtual Chassis
Ports on page 969
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