Reliability Technologies For Ip Networks; Failure Detection For Ip Networks; Protection Switching For Ip Networks - Huawei NetEngine80E Configuration Manual - Reliability

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
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1.2 Reliability Technologies for IP Networks

This section describes two typical reliability technologies, failure detection and switchover.

1.2.1 Failure Detection for IP Networks

Fault detection technologies are divided into special detection technologies and common
detection technologies.
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The fault detection mechanism is available to each layer of the TCP/IP reference module,
including:
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Fault detection has the following modes:
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1.2.2 Protection Switching for IP Networks

The standard time of protection switching on a data communication network is 50 ms. Link
redundancy is a basis of protection switching.
Link protection involves:
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The trigger mode includes BFD trigger mode and Fast Reroute (FRR) trigger mode.
Issue 02 (2011-09-10)
convergence layer and core layer alternatively. Devices of core layer are enabled with full
interconnection or half interconnection. In this manner, two devices are reachable to each
other with one route at a fast traffic rate, avoiding multi-interconnection.
On the same layer, multi-interconnection is recommended; multi-device is applicable to a
single node.
The lower-layer devices are dual-homed or multi-homed to single nodes or multiple nodes
of devices on the upper layer.
Adjustment should be taken according to traffic.
Special fault detection technologies include:
– Automatic Protection Switching (at the transport layer)
– Eth-OAM (at the link layer)
– MPLS OAM (for MPLS)
Common fault detection technologies include the Bidirectional Forwarding Detection
(BFD) that detects faults at all layers, such as the data link layer and the network layer.
Transport/Physical layer: Automatic Protection Switching (APS)
Data link layer: MPLS OAM, Eth-OAM, STP, RSTP, MSTP, and RRPP
Network layer: Hello mechanism for protocols, VRRP, and GR
Application layer: Heartbeat mechanism and retransmission mechanism for protocols
Asynchronous mode: Detection packets are sent periodically.
Query mode: A series of packets for confirmation are sent.
Echo mode: The received packet is sent back to the sender without any change.
End-to-end protection: 1:1, 1+1, 1:N, and M:N
Local protection: BFD trigger, FRR technology, and OAM technology
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1 Reliability Overview
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