HP 445946-001 - Manual (Page 176)

High availability
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Figure 26 Active-Active redundancy
HP 10GbE switch extensions to VRRP
This section describes VRRP enhancements that are implemented in switch software:
Tracking VRRP router priority
The HP 10GbE switch software supports a tracking function that dynamically modifies the priority of a
VRRP router, based on its current state. The objective of tracking is to have, whenever possible, the master
bidding processes for various virtual routers in a LAN converge on the same switch. Tracking ensures that
the selected switch is the one that offers optimal network performance. For tracking to have any effect on
virtual router operation, preemption must be enabled.
Switch software can track the attributes listed in the following table:
Table 23 VRRP tracking parameters
Parameter Description
Number of IP interfaces on the switch that are active (up)
/cfg/l3/vrrp/track/ifs
Helps elect the virtual routers with the most available
routes as the master. (An IP interface is considered
active when there is at least one active port on the same
VLAN.) This parameter influences the VRRP router's
priority in virtual interface routers.
Number of active ports on the same VLAN
/cfg/l3/vrrp/track/ports
Helps elect the virtual routers with the most available
ports as the master. This parameter influences the VRRP
router's priority in virtual interface routers.
Number of virtual routers in master mode on the switch
/cfg/l3/vrrp/track/vrs
Useful for ensuring that traffic for any particular client/
server pair is handled by the same switch, increasing
routing efficiency. This parameter influences the VRRP
router's priority in virtual interface routers.
Each tracked parameter has a user-configurable weight associated with it. As the count associated with
each tracked item increases (or decreases), so does the VRRP router's priority, subject to the weighting
associated with each tracked item. If the priority level of a standby is greater than that of the current
master, then the standby can assume the role of the master.
See “Configuring the Switch for Tracking” for an example on how to configure the switch for tracking
VRRP priority.