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Configuring Line-Card Upgrade Groups for Nonstop Software Upgrade (CLI Procedure)

Nonstop software upgrade (NSSU) enables you to upgrade the software running on an EX Series switch with redundant Routing Engines, on most EX Series Virtual Chassis, QFX3500, QFX3600, and QFX5100 Virtual Chassis, and Virtual Chassis Fabric by using a single command and with minimal disruption to network traffic.

In its default configuration, NSSU upgrades each line card in a switch or Virtual Chassis or Virtual Chassis Fabric 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 to 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.

To reduce the time an NSSU takes, you can configure line-card upgrade groups on an EX6200 or EX8200 switch with redundant Routing Engines, EX8200 Virtual Chassis, QFX3500, QFX3600, and QFX5100 Virtual Chassis, and Virtual Chassis Fabric.

Note: NSSU line-card upgrade groups are not supported for NSSUs on EX3300 Virtual Chassis, EX4200 Virtual Chassis, EX4300 Virtual Chassis, EX4500 Virtual Chassis, EX4550 Virtual Chassis, or any mixed Virtual Chassis composed of EX4200, EX4500, or EX4550 switches.

When you define an upgrade group, NSSU upgrades the line cards in the upgrade group at the same time instead of sequentially. 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. For information on how to configure LAGs, see Configuring Aggregated Ethernet Links (CLI Procedure).

• To create an upgrade group and add a line card to it:

  [edit chassis]
  user@switch# set nssu upgrade-group group-name fpcs slot-number

  For example, to create an upgrade group called group3 and add the line card in slot 5 to it:

  [edit chassis]
  user@switch# set nssu upgrade-group group3 fpcs 5

  If group3 already exists, this command adds line card 5 to group3.

• To create an upgrade group and add multiple line cards to it:

  [edit chassis]
  user@switch# set nssu upgrade-group group-name fpcs (NSSU Upgrade Groups) [list-of-slot-numbers]

  For example, to create an upgrade group called primary and add line cards in slots 1, 4, and 7 to it:

  [edit chassis]
  user@switch# set nssu upgrade-group primary fpcs [1 4 7]

  If primary already exists, this command adds line cards in slots 1, 4, and 7 to primary.

• To create an upgrade group and add a line card on a Virtual Chassis member to it:

  [edit chassis]
  user@switch# set nssu upgrade-group group-name member (NSSU Upgrade Groups) member-id fpcs slot-number

  For example, to create an upgrade group called primary-ny and add the line card on member 1 in slot 5 to it:

  [edit chassis]
  user@switch# set nssu upgrade-group primary-ny member 1 fpcs 5

  If primary-ny already exists, this command adds line card 5 on member 1 to primary-ny.

• To create an upgrade group that contains multiple line cards on a Virtual Chassis member:

  [edit chassis]
  user@switch# set nssu upgrade-group group-name member member-id fpcs [list-of-slot-numbers]

  For example, to create an upgrade group called primary-ny that contains the line cards in slots 1 and 2 on member 0 and in slots 3 and 4 on member 1:

  [edit chassis]
  user@switch# set nssu upgrade-group primary-ny member 0 fpcs [1 2]
  
  [edit chassis]
  user@switch# set nssu upgrade-group primary-ny member 1 fpcs [3 4]

• To create an upgrade group and add a line card member on a Virtual Chassis Fabric to the upgrade group:

  [edit chassis]
  user@switch# set nssu upgrade-group group-name primary fpcs value

  For example, to create an upgrade group called vcf and add a line card member:

  [edit chassis]
  user@switch# set nssu upgrade-group vcf primary fpcs 2

  If vcf already exists, this command adds line card 2 to vcf.

• To create an upgrade group that contains multiple line cards on a Virtual Chassis Fabric:

  [edit chassis]
  user@switch# set nssu upgrade-group group-name primary fpcs [list-of-slot-numbers]

  For example, to create an upgrade group called vcf that contains line cards 1 and 2:

  [edit chassis]
  user@switch# set nssu upgrade-group vcf primary fpcs [1 2]