250
AT-WR4500 Series - IEEE 802.11abgh Outdoor Wireless Routers
RouterOS v3 Configuration and User Guide
other configuration) active. A backup instance is not 'running', so all the settings attached to that interface
is inactive.
Property Description
arp
(disabled | enabled | proxy-arp | reply-only; default:
enabled
) - Address Resolution Protocol
authentication
(none | simple | ah; default:
none
) - authentication method to use for VRRP
advertisement packets
none
- no authentication
simple
- plain text authentication
ah
- Authentication Header using HMAC-MD5-96 algorithm
backup
(
read-only: flag
) - whether the instance is in the backup state
interface
(
name
) - interface name the instance is running on
interval
(
integer
: 1..255; default:
1
) - VRRP update interval in seconds. Defines how frequently the master
of the given cluster sends VRRP advertisement packets
mac-address
(
MAC address
) - MAC address of the VRRP instance. According to the RFC, any VRRP
instance should have its unique MAC address
master
(
read-only: flag
) - whether the instance is in the master state
mtu
(
integer
; default:
1500
) - Maximum Transmission Unit
name
(
name
) - assigned name of the VRRP instance
on-backup
(
name
; default:
""
) - script to execute when the node switch to backup state
on-master
(
name
; default:
""
) - script to execute when the node switch to master state
password
(
text
; default:
""
) - password required for authentication depending on method used can be
ignored (if no authentication used), 8-character long text string (for plain-text authentication) or 16-
character long text string (128-bit key required for AH authentication)
preemption-mode
(yes | no; default:
yes
) - whether preemption mode is enabled
no
- a backup node will not be elected to be a master until the current master fail even if the backup
node has higher priority than the current master
yes
- the master node always has the priority
priority
(
integer
: 1..255; default:
100
) - priority of the current node (higher values mean higher priority)
255
- RFC requires that the router that owns the IP addresses assigned to this instance had the priority
of 255
vrid
(
integer
: 0..255; default:
1
) - Virtual Router Identifier (must be unique on one interface)
All the nodes of one cluster must have the same
vrid
,
interval
,
preemption-mode
,
authentication
and
password
.
To add a VRRP instance on
ether1
interface, forming (because
priority
is
255
) a virtual router with
vrid
of
1
:
[admin@AT-WR4562] ip vrrp> add interface=ether1 vrid=1 priority=255
[admin@AT-WR4562] ip vrrp> print
Flags: X - disabled, I - invalid, M - master, B - backup
0 I name="vr1" interface=ether1 vrid=1 priority=255 interval=1
preemption-mode=yes authentication=none password="" on-backup=""
on-master=""
[admin@AT-WR4562] ip vrrp>
Note that the instance is active at once. This is because it has the priority of 255. The instance would
wait in backup mode for a new master election process to complete in its favour before assuming the
master role otherwise. This also means that there must not be other VRRP routers with the maximal
priority
