Huawei NetEngine80E Configuration Manual - Reliability page 63

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
Applicable Environment
Figure 3-4
link reliability. E-APS needs to be configured on these two devices dual-homed to RNCs. E-
APS provides higher security than single-chassis APS provides. Single-chassis APS means
interface-, subcard, and board-based APS.
Figure 3-4 Association between an E-APS group and PW redundancy
Node B
Pre-configuration Task
Before configuring E-APS, complete the following tasks:
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Data Preparation
To configure E-APS, you need the following data.
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Issue 02 (2014-09-30)
shows an E-APS network. Two network-side devices back up each other, improving
Router A
Configure an interface on the router and ensure that the link layer protocol between the
router and the RNC is Up.
Run the IGP protocol on the backbone network so that devices can communicate with each
other.
NOTE
In a PPP-based Layer 3 IP forwarding scenario, if devices use a dynamic routing protocol, the
dynamic routes have to be re-learned during an APS link switchover. In the route convergence
process, which lasts for dozens of seconds, service traffic may be lost. To prevent this problem,
configure static routes on the APS interfaces of the master, backup devices and the RNC. This
configuration can prevent traffic loss.
Data
ID of an APS group
IDs of the working and protection interfaces in an APS group
(Optional) WTR time set for an APS group
(Optional) Authentication string configured for the PGP message
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Router C
Bypass
E-APS
PW
Router B
3 APS Configuration
RNC
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