xStack Gigabit Layer 3 Switch Command Line Interface Manual
31
VRRP C
OMMANDS
VRRP
or
Virtual Routing Redundancy Protocol
is a function on the Switch that dynamically assigns responsibility for a virtual
router to one of the VRRP routers on a LAN. The VRRP router that controls the IP address associated with a virtual router is
called the Master, and will forward packets sent to this IP address. This will allow any Virtual Router IP address on the LAN to
be used as the default first hop router by end hosts. Utilizing VRRP, the administrator can achieve a higher available default
path cost without needing to configure every end host for dynamic routing or routing discovery protocols.
Statically configured default routes on the LAN are prone to a single point of failure. VRRP is designed to eliminate these
failures by setting an election protocol that will assign a responsibility for a virtual router to one of the VRRP routers on the
LAN. When a virtual router fails, the election protocol will select a virtual router with the highest priority to be the Master
router on the LAN. This retains the link and the connection is kept alive, regardless of the point of failure.
To configure VRRP for virtual routers on the Switch, an IP interface must be present on the system and it must be a part of a
VLAN. VRRP IP interfaces may be assigned to every VLAN, and therefore IP interface, on the Switch. VRRP routers within
the same VRRP group must be consistent in configuration settings for this protocol to function optimally.
The VRRP commands in the Command Line Interface (CLI) are listed, along with the appropriate parameters, in the following
table.
Command Parameters
enable vrrp
{ping}
disable vrrp
{ping}
create vrrp vrid
<vrid 1-255> ipif <ipif_name 12> ipaddress <ipaddr> {state
[enable | disable] | priority <int 1-254> | advertisement_interval
<int 1-255> | preempt [true | false] | critical_ip <ipaddr> |
critical_ip_state [enable | disable]}
config vrrp vrid
<vrid 1-255> ipif <ipif_name 12> {state [enable | disable] |
priority <int 1-254> | ipaddress <ipaddr> |
advertisement_interval <int 1-255> | preempt [true | false] |
critical_ip <ipaddr> | critical_ip_state [enable | disable]}
config vrrp ipif
<ipif_name 12> [authtype [none | simple authdata <string 8> | ip
authdata <string 16>]]
show vrrp
{ipif <ipif_name 12> {vrid <vrid 1-255>}
delete vrrp
{vrid <vrid 1-255> ipif <ipif_name 12>}
Each command is listed, in detail, in the following sections.
enable vrrp
Purpose
To enable the VRRP function on the Switch.
Syntax
enable vrrp {ping}
This command will enable the VRRP function on the Switch.
Parameters
{ping}
– Adding this parameter to the command will allow the virtual
IP address to be pinged from other host end nodes to verify
connectivity. This will only enable the ping connectivity check
function. To enable the VRRP protocol on the Switch, omit this
parameter. This command is disabled by default.
Description
265
