Radware Alteon Application Manual page 516

Alteon Application Switch Operating System Application Guide
High Availability
Parameters and Commands
Number of physical ports that have active Layer
4 processing.
• To enable tracking on Layer 4 ports:
/cfg/l3/vrrp/vr/track/l4pts/ena
• To change the Layer 4 ports tracking
increment:
/cfg/l3/vrrp/track/l4pts <[0-
254]>
Number of healthy real servers behind the
virtual server IP address that is the same as the
IP address of the virtual server router on
Alteon.
/cfg/l3/vrrp/track/reals
In networks where the Hot Standby Router
Protocol (HSRP) is used for establishing router
failover, the number of Layer 4 client-only ports
that receive HSRP advertisements.
/cfg/l3/vrrp/track/hsrp
Tracking HSRP on VLAN.
/cfg/l3/vrrp/track/hsrv
Each tracked parameter is associated with a user-configurable weight. 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 backup is greater than that of
the current master, then the backup can assume the role of the master.
For an example on how to configure Alteon for tracking VRRP priority, see
page 542.
Tracking Service-Based Virtual Router Groups
Alteon supports a tracking function that dynamically modifies the priority of a service-based virtual
router group (vrgroup), which contains one or more virtual routers. Once a VRRP router is added to
a vrgroup, the group's tracking configuration overrides an individual VRRP router's tracking.
Alteon allows for the independent failover of individual virtual router groups on the same Alteon.
When Web hosting is shared between two or more customers on a single VRRP device, several
virtual routers can be grouped to serve the high availability needs of a specific customer.
Each vrgroup is treated as a single entity regardless of how many virtual routers belong to the
vrgroup. When Alteon tracks a vrgroup, it measures the resources contained in this group, and
updates all members of the vrgroup with the same priority. When any of the tracked parameters
changes the priority for one of the virtual routers belonging to the vrgroup, then the entire vrgroup
will fail over.
Tracking can be configured for each vrgroup, with the same resources tracked on individual virtual
routers (see Table 48 - VRRP Tracking Parameters, page
tracked on a vrgroup basis is the number of virtual routers.
516
Table 48: VRRP Tracking Parameters (cont.)
Description
Helps elect the main Layer 4 Alteon as the
master. This parameter influences the VRRP
router's priority in both virtual interface routers
and virtual server routers.
Helps elect the Alteon with the largest server pool
as the master, increasing Layer 4 efficiency. This
parameter influences the VRRP router's priority in
virtual server routers only.
Helps elect the Alteon closest to the master HSRP
router as the master, optimizing routing
efficiency. This parameter influences the VRRP
router's priority in both virtual interface routers
and virtual server routers.
A hot standby router on VLAN (HSRV) is used in
VLAN-tagged environments. Enable this option to
increment only that VRRP instance that is on the
same VLAN as the tagged HSRP master flagged
packet. This command is disabled by default.
Tracking Virtual Routers,
515). The only resource that cannot be
Document ID: RDWR-ALOS-V2900_AG1302