Alteon Application Switch Operating System Application Guide
High Availability
574
Document
ID:
RDWR-ALOS-V2900_AG1302
Service-Based Session Failover
This section describes the following session failover-related topics:
•
Session Failover for Hot Standby Configurations, page 574
•
Operations During Session Mirroring on Reboot, page 575
•
Service-based Session Failover (Session Mirroring) Limitations and Recommendations, page 576
•
Service-Based Session Failover Commands, page 576
•
Automate Session Mirroring, page 577
•
Session Failover for Active-Standby Configurations, page 578
Session Failover for Hot Standby Configurations
Alteon supports the failover of a session based on a service. The Network Access, Authentication,
and Accounting protocol (NAAP) is used as the communication mechanism between the master and
backup. Since NAAP is a Layer 2 protocol, the Alteons need to be connected directly over the
interswitch link.
You must also enable the Spanning Tree protocol in hot standby configurations.
In ADC-VX, enabling and disabling the interswitch link for session mirroring is available per vADC. As
vADCs are completely independent instances, they are neither dependant on the physical attributes
of Alteon nor on the physical connectivity available. The vADC administrator decides whether to
enable the interswitch link feature. To use the feature, the vADC administrator selects one of the
assigned VLAN IDs and enables the functionality as follows:
Similar to a standalone Alteon, the vADCs must share a broadcast domain in order to send the
session updates the neighboring vADC.
>> SLB Port 1# intersw
Current inter-switch processing: disabled
Enter new inter-switch processing [d/e]: e
Enter new ISL VLAN: 200
