Example: Configuring Nonstop Software Upgrade On Ex Series Switches - Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual

Complete Software Guide for Junos

Example: Configuring Nonstop Software Upgrade on EX Series Switches

Requirements
Overview and Topology
1186
®
OS for EX Series Ethernet Switches, Release 10.4
Understanding Nonstop Active Routing on EX Series Switches on page 1175
You can use nonstop software upgrade (NSSU) to upgrade the software on EX8200
switches with redundant Routing Engines. NSSU allows you to upgrade both Routing
Engines with a single command and with minimal disruption to network traffic during
the upgrade. To reduce the time an NSSU takes, you can configure line-card upgrade
groups.
This example shows how to configure line-card upgrade groups for use with NSSU:
Requirements on page 1186
Overview and Topology on page 1186
Configuration on page 1187
This example uses the following hardware and software components:
An EX8200 switch with redundant Routing Engines
Junos OS Release 10.4 or later for EX Series switches
Before you begin to configure line-card upgrade groups, ensure that you have configured
the link aggregation groups (LAGs). See "Overview and Topology" on page 1186 for details.
In its default configuration, NSSU upgrades each line card one at a time. Traffic continues
to flow through the other line cards while a line card is being restarted as part of the
upgrade. This behavior allows you minimize disruption to traffic by configuring link
aggregation groups (LAGs) such that the member links of each LAG reside on different
line cards. When one member link of a LAG is down, the remaining links are up, and traffic
continues to flow through the LAG.
Because the default configuration upgrades each line card one at a time, the upgrade
can take some time to complete. You can reduce the time it takes to perform an NSSU
by configuring line-card upgrade groups. Instead of being upgraded sequentially, the line
cards in an upgrade group are upgraded simultaneously. To achieve minimal traffic
disruption, you must define the line-card upgrade groups such that the member links of
the LAGs reside on line cards that are in different upgrade groups.
This example uses an EX8200 switch that has five line cards installed in slots 0 through
4. Two LAGs have been configured:
—has two member links, one on the line card in slot 0 and one on the line card in
ae0
slot 1.
ae1 —has two member links, one on the line card in slot 2 and one on the line card in
slot 3.
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