Upgrading From Vrrpv2 To Vrrpv3 - Juniper EX9200 Features Manual

Upgrading from VRRPv2 to VRRPv3

Copyright © 2017, Juniper Networks, Inc.
Chapter 13: Understanding How the VRRP Router Failover Mechanism Prevents Network Failures
5.3.8. Starting with Release 12.2, VRRP (IPv6) follows RFC 5798 and checksum is
calculated based on RFC 5798 section 5.2.8. Because of the differences in VRRP checksum
calculations, IPv6 VRRP configured on routers that use Junos OS Release 12.2 and later
releases does not interoperate with IPv6 VRRP configured in releases before Junos OS
Release 12.2.
To make the router with Junos OS Release 12.2 (or later Junos OS releases) IPv6 VRRP
interoperate with the router running Junos OS releases earlier than Release 12.2, include
the checksum-without-pseudoheader
hierarchy level in the router with Junos OS Release 12.2 or later.
Here are some general points to know about VRRP interoperability:
If you have configured VRRPv3 (IPv4 or IPv6) on routers that use Junos OS Release
12.2 or later releases, it will not operate with routers that use Junos OS Release 12.1 or
earlier releases. This is because only Junos OS Release 12.2 and later releases support
VRRPv3.
VRRP (IPv4 or IPv6) configured on routers that use Junos OS Release 12.2 and later
releases interoperate with VRRP (IPv4 or IPv6) configured on routers that use releases
earlier than Junos OS Release 12.2.
VRRPv3 for IPv4 does not interoperate with the previous versions of VRRP. If VRRPv2
IPv4 advertisement packets are received by a router on which VRRPv3 is enabled, the
router transitions itself to the backup state to avoid creating multiple masters in the
network. Due to this behavior, you must be cautious when enabling VRRPv3 on your
existing VRRPv2 networks. See
more information.
NOTE: VRRPv3 advertisement packets are ignored by the routers on which
previous versions of VRRP are configured.
Enable VRRPv3 in your network only if VRRPv3 can be enabled on all the VRRP routers
in your network.
Enable VRRPv3 on your VRRPv2 network only when upgrading from VRRPv2 to VRRPv3.
Mixing the two versions of VRRP is not a permanent solution.
Upgrading from VRRPv2 to VRRPv3 must be done very carefully to avoid traffic loss, due
to these considerations:
It is not possible to configure VRRPv3 on all routers simultaneously.
During the transition period, both VRRPv2 and VRRPv3 operate in the network.
Changing VRRP versions restarts the state machine for all VRRP groups.
VRRPv3 (for IPv4) routers default to the backup state when they get VRRPv2 (for
IPv4) advertisement packets.
configuration statement at the
"Upgrading from VRRPv2 to VRRPv3" on page 123
[edit protocols vrrp]
for
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