3Com 3500 - page 493

ip vrrp define 493
■When you define a Primary router on a VLAN that contains a single
interface, the single interface is automatically chosen as the primary
address when you select IP-address as the Address mode.
■When you define a Backup virtual router, selecting auto-learn as
the address mode configures the Backup router to lear n the IP
addresses that are associated with the virtual router by means of VRRP
advertisements from the Primary router. The Primary router must be up
for backup routers to auto-learn the addresses that are associated
with the specified VRID.
■When you define Backup virtual routers, t he auto-learn address mode
option enables auto address learning for the specified VRI D. If a new
interface is added to the VLAN on a primary virtual router, the new IP
address is sent out in VRRP advertisements so that the Backup routers
in auto-learn mode can learn the new a ddress without having to
manually add the new address to each backup router.
Advertisement
Intervals
■The smaller the advertisement interval, the smaller the failover time if
the master fails.
■The advertisement interval must be the same across the set of VRRP
routers that are associated with a single VRID. Backup routers must
have the same advertisement interval as the Master router.
Options
Prompt Description Possible Values [Default]
Virtual router type Type of virtual router
that you want to
define
■Primary
■Backup
Primary
VLAN interface
index
Index number of the
virtual LAN (VLAN) on
which you want to
define the virtual
router
■Index number of an IP
virtual LAN (VLAN) that
is defined on the
system.
■? (for a list of selectable
indexes)
Index
number of
first
available
VLAN
VRID Virtual router
identifier. Identifi es
the virtual router that
you want to define on
the LAN.
1 – 255 1
Address mode Method by which th e
virtual router you
want to define learns
its IP addresses
■auto-learn
■IP address
auto-learn