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Sharing/active-active failover, Sharing/active-active failover 260, Figure 11-7: active-active high availability 260 – Nortel Networks WEB OS 212777 User Manual

Page 260: Table 11-2, Sharing active-active failover 260

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Web OS 10.0 Application Guide

260

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Chapter 11: High Availability

212777-A, February 2002

Sharing/Active-Active Failover

Web OS supports sharing of interfaces at both Layer 3 and Layer 4, as shown in

Figure 11-7

.

With sharing, an IP interface or a VIP address can be active simultaneously on multiple
switches, enabling active-active operation as shown in

Table 11-2

.

Figure 11-7 Active-Active High Availability

When sharing is used, incoming packets are processed by the switch on which they enter the
virtual router. The ingress switch is determined by external factors, such as routing and Span-
ning Tree configuration.

N

OTE

Sharing cannot be used in configurations where incoming packets have more than one

entry point into the virtual router—for example, where a hub is used to connect the switches.

Table 11-2 Sharing Active-Active Failover

Web Switch 1 Master-Active VR 1

VRID 2
VIP: 205.178.13.226
MAC address 00-00-5E-OO-01-02

Backup-Active VR 2
VRID 4
VIP: 205.178.13.240
MAC address 00-00-5E-OO-01-04

Master-Active VR 3
VRID 6
VIP: 205.178.13.110
MAC address 00-00-5E-OO-01-06

Web Switch 2 Backup-Active VR 1

VRID 2
VIP: 205.178.13.226
MAC address 00-00-5E-OO-01-02

Master-Active VR 2
VRID 4
VIP: 205.178.13.240
MAC address 00-00-5E-OO-01-04

Backup-Active VR 3
VRID 6
VIP: 205.178.13.110
MAC address 00-00-5E-OO-01-06

Internet

Router

Router

Backup-Active VR 1
Master-Active VR 2

Backup-Active VR 3

Master-Active VR 1

Backup-Active VR 2

Master-Active VR 3

Web Switch 1

Web Switch 2