Radware Alteon Application Manual page 536

Alteon Application Switch Operating System Application Guide
High Availability
Switch-Centric Virtual Router Group
Hot standby requires all virtual routers on an Alteon to fail over together as a group. For more
information about the switch-based virtual router groups, see
page 514.
When enabled, the switch-centric virtual router group aggregates all virtual routers as a single
entity. All virtual routers fail over as a group, and cannot fail over individually. As members of a
group, all virtual routers on Alteon (and therefore Alteon itself), are either the master or a backup.
To enable a switch-based virtual router group
>> Main# /cfg/l3/vrrp/group ena
Layer 4 Port States
When Alteon changes from master to backup, it does not process any traffic destined to the virtual
server routers configured on that Alteon. However, Layer 4 processing is still enabled. An Alteon that
has become the backup can still process traffic addressed to its virtual server IP address. Filtering is
also still functional.
Each VRRP advertisement can include up to 1024 addresses, and is therefore is not limited to a
single virtual router IP address. A VRRP advertisement packet that contains all virtual routers are
advertised in the same packet, thus conserving processing and buffering resources.
Hot Standby and Interswitch Port States
The hot standby configuration includes two Layer 4 port states: hotstan (hot standby), and intersw
(interswitch).
Notes
• A port cannot be configured to support both hot standby and interswitch links.
• The interswitch setting for hot standby is not the same as Cisco's ISL protocol.
To set the state for links that attach to the standby Alteon
>> Main# /cfg/slb/port x/hotstan
When the hotstan option is enabled and all hot standby ports have a link, the virtual router group's
priority is incremented by the track other virtual routers value. This lets the Alteons fail over
when a hot standby port loses a link. Other enabled tracking features have an effect only when all
hot standby ports on Alteon have a link. The default virtual routers tracking value is 2 seconds. This
is an automatic process that cannot be turned off.
Note: All ports with hot standby enabled must be connected to another Alteon.
536
Switch-Based VRRP Groups,
Document ID: RDWR-ALOS-V2900_AG1302