Nonstop Software Upgrade; Understanding Vrrp On Ex Series Switches; Overview Of Vrrp On Ex Series Switches - Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual

Complete Software Guide for Junos

Nonstop Software Upgrade

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Understanding VRRP on EX Series Switches

Overview of VRRP on EX Series Switches

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OS for EX Series Ethernet Switches, Release 10.4
Nonstop software upgrade (NSSU) is available on EX8200 switches with redundant
Routing Engines. NSSU takes advantage of graceful Routing Engine switchover and
nonstop active routing to enable upgrading the Junos OS version running on a switch
with no disruption to the control plane. In addition, NSSU upgrades line cards one at time,
permitting traffic to continue to flow through the line cards that are not being upgraded.
By configuring LAGs such that the member links reside on different line cards, you can
achieve minimal traffic disruption when performing an NSSU.
For more information on high availability features, see the Junos OS High Availability
Configuration Guide.
EX4200 Virtual Chassis Overview on page 891
EX8200 Virtual Chassis Overview on page 1071
Understanding VRRP on EX Series Switches on page 1172
Understanding Aggregated Ethernet Interfaces and LACP on page 1244
Understanding Nonstop Active Routing on EX Series Switches on page 1175
Understanding Nonstop Software Upgrade on EX Series Switches on page 1176
Juniper Networks EX Series Ethernet Switches support the Virtual Router Redundancy
Protocol (VRRP) and VRRP for IPv6. This topic covers:
Overview of VRRP on EX Series Switches on page 1172
Examples of VRRP Topologies on page 1173
You can configure the Virtual Router Redundancy Protocol (VRRP) or VRRP for IPv6 on
Gigabit Ethernet interfaces, 10-Gigabit Ethernet interfaces, and logical interfaces on EX
Series switches. When VRRP is configured, the switches act as virtual routing platforms.
VRRP enables hosts on a LAN to make use of redundant routing platforms on that LAN
without requiring more than the static configuration of a single default route on the hosts.
The VRRP routing platforms share the IP address corresponding to the default route
configured on the hosts. At any time, one of the VRRP routing platforms is the master
(active) and the others are backups. If the master routing platform fails, one of the backup
routing platforms becomes the new master, providing a virtual default routing platform
and enabling traffic on the LAN to be routed without relying on a single routing platform.
Using VRRP, a backup EX Series switch can take over a failed default switch within a few
seconds. This is done with minimum loss of VRRP traffic and without any interaction
with the hosts.
VRRP for IPv6 provides a much faster switchover to an alternate default routing platform
than IPv6 Neighbor Discovery (ND) procedures. VRRP for IPv6 does not support the
authentication-type or authentication-key statements.
Copyright © 2010, Juniper Networks, Inc.