Radware Alteon Application Manual page 537

To set the state for links that are used by VRRP to deliver updates
>> Main# /cfg/slb/port <port number> /intersw ena
Enter VLAN Number: 202
Current inter-switch processing: disabled
Enter new inter-switch processing [d/e]: e
The hot standby Alteon listens to the master's VRRP updates. After an interval has expired without
receiving a update, the backup takes over. The forwarding states of hot standby ports are controlled
much like the forwarding states of the hot standby (hotstan) approach. Enabling hot standby on a
port allows the hot standby algorithm to control the forwarding state of the port. If an Alteon is the
master, the forwarding states of the hot standby ports are enabled. If an Alteon is a backup, the hot
standby ports are blocked from forwarding or receiving traffic.
Note: The VRRP hot standby approach does not support single-link failover. If one hot standby port
loses a link, the entire Alteon must become the master to eliminate loss of connectivity.
The forwarding states of non-hot standby ports are not controlled via the hot standby algorithm,
allowing the additional ports to provide added port density. The client ports on both Alteons should
be able to process or forward traffic to the master.
The interswitch port state is only a place holder. It forces you to configure an interswitch link when
hot standby is globally enabled and prohibits the interswitch link from also being a hot standby link
for VRRP advertisements. These advertisements must be able to reach the backup Alteon.
Hot Standby Configuration
A hot standby configuration enables all processes to fail over to a backup if any type of failure
occurs. The primary application for hot standby redundancy is to avoid bridging loops when using
the Spanning Tree Protocol (STP), IEEE 802.1d. VRRP-based hot standby supports the default
spanning tree only. It does not support multiple spanning trees.
Figure 80 - Hot Standby Configuration, page 537
use redundancy. This topology contains bridging loops that require using STP. In the typical network,
STP failover time is 45-50 seconds, much longer than the typical failover rate using VRRP only.
Note: To use hot standby redundancy, Alteon peers must have an equal number of ports.
Figure 80: Hot Standby Configuration
Document ID: RDWR-ALOS-V2900_AG1302
Alteon Application Switch Operating System Application Guide
illustrates a classic network topology designed to
High Availability
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