3Com SuperStack II 9300 Command Reference Manual page 496

C 17: V
496
HAPTER IRTUAL
Advertisement
Intervals
R R (VRRP)
OUTER EDUNDANCY
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 learn 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, the auto-learn address mode
option enables auto address learning for the specified VRID. 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 address without having to
manually add the new address to each backup router.
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
VLAN Index number of the
interface virtual LAN (VLAN) on
index which you want to
define the virtual
router
VRID Virtual router
identifier. Identifies
the virtual router that
you want to define on
the LAN.
Virtual Type of virtual router
router type that you want to
define
Address Method by which the
mode virtual router you
want to define learns
its IP addresses
Possible Values
Index number of an IP
virtual LAN (VLAN) that is
defined on the system.
? (for a list of selectable
indexes)
1 – 255
Primary
Backup
auto-learn
IP address
[Default]
Index
number of
first available
VLAN
1
Primary
auto-learn