Nortel Networks WEB OS 212777 - Manual (Page 263)

Web OS 10.0 Application Guide
Chapter 11: High Availability n 263
212777-A, February 2002
High Availability Configurations
Alteon Web switches offer flexibility in implementing redundant configurations. This section
discusses a few of the more useful and easily deployed configurations:
n
“Active-Standby Virtual Server Router Configuration” on page 263
n
“Active-Active VIR and VSR Configuration” on page 265
n
“Active/Active Server Load Balancing Configuration” on page 267
n
“VRRP-Based Hot-Standby Configuration” on page 275
Active-Standby Virtual Server Router Configuration
Figure 11-8 shows an example configuration where two Alteon Web switches are used as
VRRP routers in an active-standby configuration, implementing a virtual server router. Active-
standby redundancy should be used in configurations that cannot support sharing, that is, con-
figurations where incoming packets will be seen by more than one switch, such as instances
where a hub is used to connect the switches. In this configuration, when both switches are
healthy, only the master responds to packets sent to the virtual server IP address.
Figure 11-8 Active-Standby High-Availability Configuration
Although this example shows only two switches, there is no limit on the number of switches
used in a redundant configuration. It is possible to implement an active-standby configuration
across all the VRRP-capable switches in a LAN.
Each VRRP-capable switch in an active-standby configuration is autonomous. Switches in a
virtual router need not be identically configured.
Internet
Router
Router
Backup-Standby
VRID 2
VIP: 205.178.13.226
MAC address 00-00-5E-00-01-02
Server 4
RIP 1: 205.178.13.104
RIP 2: 205.178.13.108
Master-Active
VRID 2
VIP: 205.178.13.226
MAC address 00-00-5E-00-01-02
Server 3
RIP 1: 205.178.13.103
RIP 2: 205.178.13.107
Server 2
RIP 1: 205.178.13.102
RIP 2: 205.178.13.106
Server 1
RIP 1: 205.178.13.101
RIP 2: 205.178.13.105
Web Switch 1
Web Switch 2