High availability 147
Active-Active redundancy
In an active-active configuration, shown in the following figure, two switches provide redundancy for each other, with
both active at the same time. Each switch processes traffic on a different subnet. When a failure occurs, the remaining
switch can process traffic on all subnets.
The following figure shows an Active-Active configuration example.
Figure 26 Active-Active redundancy
GbE2c extensions to VRRP
This section describes VRRP enhancements that are implemented in GbE2c software:
Tracking VRRP router priority
GbE2c 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.
GbE2c software can track the attributes listed in the following table:
Table 24 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/vr
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.
Virtual router deployment considerations
Review the following issues described in this section to prevent network problems when deploying virtual routers:
• Assigning VRRP Virtual Router ID
• Configuring the Switch for Tracking
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