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Terminology, When do you need it, Scenario 1 -- redundancy – ZyXEL Communications ES-4024A User Manual

Page 79

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ES-4024A Series Switch Support Notes


All contents copyright (c) 2006 ZyXEL Communications Corporation.

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handles all packets while the others are backup devices. When the master one

fails, the backup device with highest priority will take over the packet handling.

Terminology:

• VRRP Router: A router running the Virtual Router Redundancy

Protocol.

• Virtual Router: An abstract object managed by VRRP that acts as a

default router for hosts on a shared LAN.

• Virtual Router Master: VRRP Router with forwarding responsibility of a

VR.

• Virtual Router Backup: Set of VRRP Routers available to assume

forwarding responsibility when VR Master fails.

When do you need it?

VRRP is a L3 virtual routing protocol. For a network administrator, to ensure

serice/network always available without down time at gateway, VRRP can

benefit this and further provide load sharing if more than one uplink is applied.

Scenario 1 -- Redundancy

The network administrator Peter of ZyCompany wants to ensure the high

available of their server farm from LAN users. According to vendor’s

recommendation, they buy two ZyXEL ES-4024 switches and have the

configuration step by step as following.