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Virtual Chassis Software Upgrade and Failover Features
EX4200 switches provide these features for increased resiliency in Virtual Chassis
configurations:
•
Virtual Chassis atomic software upgrade—When you upgrade software in a Virtual
Chassis configuration, the upgrade will either succeed or fail on all member switches,
preventing the situation in which only some of the Virtual Chassis member switches
are upgraded.
•
Virtual Chassis fast failover—A hardware-assisted failover mechanism that
automatically reroutes traffic and reduces traffic loss in the event of a link failure.
•
Virtual Chassis split and merge—If there is a disruption to the Virtual Chassis
configuration due to member switches failing or being removed from the configuration,
the Virtual Chassis configuration splits into two separate Virtual Chassis.
Link Aggregation
You can combine multiple physical Ethernet ports to form a logical point-to-point link,
known as a
link aggregation group (LAG)
or
bundle
. A LAG provides more bandwidth than
a single Ethernet link can provide. Additionally, link aggregation provides network
redundancy by load-balancing traffic across all available links. If one of the links should
fail, the system automatically load-balances traffic across all remaining links.
You can select up to eight Ethernet interfaces and include them within a LAG. In an
EX4200 Virtual Chassis configuration, the interfaces that form a LAG can be on different
members of the Virtual Chassis. See “Understanding Virtual Chassis Configurations and
Link Aggregation” on page 932.
Related
Documentation
•
For more information on high availability features, see the
Junos OS High Availability
Configuration Guide
at
http://www.juniper.net/techpubs/software/junos/index.html
.
•
Virtual Chassis Overview on page 921
•
Understanding Virtual Chassis Components on page 924
•
Understanding Virtual Chassis Configurations and Link Aggregation on page 932
•
Understanding VRRP on EX Series Switches on page 1671
1113
Copyright © 2010, Juniper Networks, Inc.
Chapter 50: Interfaces—Overview
Summary of Contents for JUNOS OS 10.3 - SOFTWARE
Page 325: ...CHAPTER 17 Operational Mode Commands for System Setup 229 Copyright 2010 Juniper Networks Inc ...
Page 1323: ...CHAPTER 56 Operational Mode Commands for Interfaces 1227 Copyright 2010 Juniper Networks Inc ...
Page 2841: ...CHAPTER 86 Operational Commands for 802 1X 2745 Copyright 2010 Juniper Networks Inc ...
Page 3367: ...CHAPTER 113 Operational Mode Commands for CoS 3271 Copyright 2010 Juniper Networks Inc ...
Page 3435: ...CHAPTER 120 Operational Mode Commands for PoE 3339 Copyright 2010 Juniper Networks Inc ...
Page 3529: ...CHAPTER 126 Operational Mode Commands for MPLS 3433 Copyright 2010 Juniper Networks Inc ...