R3102-R3103-HP 6600/HSR6600 Routers High Availability Configuration Guide

4
Technology
Introduction
Reference
RPR
RPR is a new MAC layer protocol designed for transferring mass
data services over MANs. It can operate on SONET/SDH,
DWDM and Ethernet to provide flexible and efficient networking
schemes for broadband IP MANs carriers.
"Configuring RPR"
RRPP
RRPP is a link layer protocol designed for Ethernet rings. RRPP can
prevent broadcast storms caused by data loops when an Ethernet
ring is healthy, and rapidly restore the communication paths
between the nodes in the event that a link is disconnected on the
ring.
"Configuring RRPP"
FRR
FRR provides a quick per-link or per-node protection on an LSP.
Once a link or node fails on a path, FRR reroutes the path to a
new link or node to bypass the failed link or node. This can
happen as fast as 50 milliseconds minimizing data loss. Protocols
such as RIP, OSPF, IS-IS, static routing, and RSVP-TE support this
technology.
Layer 3—IP Routing
Configuration Guide,
MPLS Configuration
Guide, and
configuration guide
of the corresponding
protocols
GR
GR ensures the continuity of packet forwarding when a protocol,
such as BGP, IS-IS, OSPF, LDP, or RSVP-TE, restarts, or during an
active/standby switchover process. It needs other devices to
implement routing information backup and recovery.
Related chapters in
Layer 3—IP Routing
Configuration Guide
and MPLS
Configuration Guide
NSR
NSR ensures non-stop data transmission during an active/standby
switchover by backing up IP/MPLS forwarding information from
the active MPU to the standby MPU. Upon an active/standby
switchover, NSR can complete link state recovery and route
re-generation without requiring the cooperation of other devices.
IS-IS supports this feature.
Layer 3—IP Routing
Configuration Guide
Stateful failover
Two devices back up the services of each other to ensure that the
services on them are consistent. If one device fails, the other
device can take over the services by using VRRP or dynamic
routing protocols. Because the other device has already backed
up the services, service traffic can pass through the other device,
avoiding service interruption.
"Configuring stateful
failover"
VRRP
VRRP is an error-tolerant protocol, which provides highly reliable
default links on multicast and broadcast LANs such as Ethernet,
avoiding network interruption due to failure of a single link.
"Configuring VRRP"