ZyXEL Communications ZyXEL Dimension ES-4124 - Manual (Page 86)

ES-4124 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.