Radware Alteon Application Manual page 517

Alteon Application Switch Operating System Application Guide
High Availability
If failover occurs on a customer link, only the group of virtual routers associated with that
customer's vrgroup will fail over to the backup. Other vrgroups configured for other customers do
not fail over. For example, if a vrgroup is configured to track ports, a port failure will decrease the
priority of the vrgroup. The lowered priority causes this vrgroup to fail over to its equivalent vrgroup
on the other Alteon.
For an example on how to configure Alteon for tracking VRRP priority, see Service-Based Virtual
Router Groups, page 543.
VRRP Holdoff Timer
When an Alteon becomes the VRRP master at power up or after a failover operation, it may begin to
forward data traffic before the connected gateways or real servers are operational. Alteon may
create empty session entries for the coming data packets and the traffic cannot be forwarded to any
gateway or real server.
Alteon supports a VRRP holdoff timer, which pauses VRRP instances from starting or changing to
master state during the initialization.The VRRP holdoff timer can be set from 0 to 255 seconds. The
VRRP master waits the specified number of seconds before forwarding traffic to the default gateway
and real servers.
To set the VRRP holdoff timer
>> Main# /cfg/l3/vrrp/holdoff <0-255 seconds>
OSPF Cost Update
Starting with version 28.1.50.0, Alteon supports OSPF cost updates based on VRRP status. This
includes new VRRP tracking options and OSPF cost awareness.
Using cost updating, the entire OSPF path remains consistent across multiple links, ensuring that
services are not interrupted.
Figure 77 - OSPF VRRP Topology Using Cost Updating, page 517 illustrates an example of OSPF
VRRP topology using cost updating.
Figure 77: OSPF VRRP Topology Using Cost Updating
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Document ID: RDWR-ALOS-V2900_AG1302