This article provides an example and explanation for the support of group ID 0 with VRRP.
The technical documentation, Understanding VRRP, specifies that the VRRP group supports the range 0-255.
However, in RFC2338 and RFC3768, it specifies that the range is 1-255:
VRID Virtual Router Identifier. Configured item
in the range 1-255 (decimal). There is no
default.
VRID Virtual Router Identifier. Configurable item
in the range 1-255 (decimal). There is no
default.
Topology:
EX4300-1 ge-0/0/0 ---------------ge-0/0/0 EX4300-2
EX4300-1 Config
set vlans vlan10 vlan-id 10
set vlans vlan10 l3-interface irb.10
set interfaces ge-0/0/0 unit 0 family ethernet-switching interface-mode access
set interfaces ge-0/0/0 unit 0 family ethernet-switching vlan members 10
set interfaces irb unit 10 family inet address 10.10.10.5/24 vrrp-group 0 virtual-address 10.10.10.254
set interfaces irb unit 10 family inet address 10.10.10.5/24 vrrp-group 0 priority 110
EX4300-2 Config
set vlans vlan10 vlan-id 10
set vlans vlan10 l3-interface irb.10
set interfaces ge-0/0/0 unit 0 family ethernet-switching interface-mode access
set interfaces ge-0/0/0 unit 0 family ethernet-switching vlan members 10
set interfaces irb unit 10 family inet address 10.10.10.6/24 vrrp-group 0 virtual-address 10.10.10.254
set interfaces irb unit 10 family inet address 10.10.10.6/24 vrrp-group 0 priority 100
Output:
root@EX4300-1# run show vrrp
Interface State Group VR state VR Mode Timer Type Address
irb.10 up 0 master Active A 0.156 lcl 10.10.10.5
vip 10.10.10.254
root@EX4300-2# run show vrrp
Interface State Group VR state VR Mode Timer Type Address
irb.10 up 0 backup Active D 2.786 lcl 10.10.10.6
vip 10.10.10.254
mas 10.10.10.5
In Junos, the group ID 0 for VRRP is supported. This can be seen as an extension to the RFC.