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Technology
Introduction
GR ensures the continuity of packet forwarding when a protocol,
such as BGP, IS-IS, OSPF, IPv6 BGP, IPv6 IS-IS, or OSPFv3
restarts, or during an active/standby switchover process. It needs
GR
other devices to implement routing information backup and
recovery.
NSR is a new feature used to ensure non-stop data transmission
during an active/standby switchover. Devices that have formed
an IRF fabric support this feature. It backs up IP forwarding
NSR
information from the master to the subordinate. Upon an
active/standby switchover, NSR can complete link state recovery
and route re-generation without requiring the cooperation of
other devices. IS-IS and OSPF support this feature.
VRRP is an error-tolerant protocol that provides highly reliable
VRRP
default links on multicast and broadcast LANs such as Ethernet,
avoiding network interruption due to failure of a single link.
A single availability technology cannot solve all problems. Therefore, to enhance network availability,
use a combination of availability technologies, chosen on the basis of detailed analysis of network
environments and user requirements. For example, connect access-layer devices to distribution-layer
devices over redundant links, and fully mesh core-layer devices. Also, consider network availability
during planning before you build a network.
10
Reference
Layer 3—IP Routing
Configuration
Guide/Configuration
Guide of the
corresponding
protocols
Layer 3—IP Routing
Configuration Guide
/Configuration
Guide of the
corresponding
protocols
VRRP configuration in
High Availability
Configuration Guide

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