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Send success: 0 Receive success: 0
Master MPU receive from LPU: 0 Slave MPU send to LPU: 0
Receive fail: 0 Send fail: 0
Receive success: 0 Send success: 0
------------------------------------------------------------
IO board:(Slot 2)
Master LPU send to MPU: 0 Slave LPU receive from MPU: 0
Send fail:0 Receive fail: 0
Send success: 0 Receive success: 0
11.7 Configuring L2TP Two-node Hot Backup
L2TP two-node hot backup can be configured on LACs, improving L2TP access reliability.
L2TP two-node hot backup allows users to get online again without re-dialing up if a network
fault occurs.
Context
NOTE
The X1 and X2 models of NE80E/40Es do not support RUI; therefore, they do not support L2TP two-node
hot backup.
The RADIUS server cannot deliver the Tunnel-Client-Endpoint attribute during L2TP hot backup
configuration.
11.7.1 Before You Start
Before configuring L2TP two-node hot backup, familiarize yourself with the usage scenario,
complete the pre-configuration tasks, and obtain the required data.
Applicable Environment
L2TP tunnels can be used to provide enterprise user access services and wholesale services. As
these services are the major services that operators provide and have high user experience
requirements, L2TP tunnels must support high reliability. L2TP two-node hot backup, in
addition to BRAS user information backup, is required on the master and slave routers.
In the scenario where an L2TP tunnel is used to transmit access services of enterprise users, a
remote terminal sends a dialup request to a local operator gateway, and the gateway relays the
request to the enterprise network along an L2TP tunnel. The operator can provide two LAC
gateways. One LAC is the master and the other is the backup. If the master LAC fails, the backup
LAC takes over access services for a terminal. During this process, services are interrupted and
the terminal re-dials up and then resumes services.
In the scenario where L2TP tunnels are used to transmit wholesale services, an ISP network
connects two LNSs to a LAC on a bearer network, improving tunnel reliability. One LNS is the
master and the other is the backup. If LNS1 fails, an L2TP tunnel between the LAC and LNS2
takes over services. To implement rapid service restoration in the scenario where an active L2TP
tunnel and a standby L2TP tunnel are established between two LNSs and a LAC, the LNSs and
LAC must support a set of packets and processing defined in RFC 4951. In this scenario,
terminals can rapidly restore services without re-dialing up if an LNS fails.
On the network as shown in
, L2TP two-node hot backup is configured on two LACs,
improving L2TP service reliability. Terminals can rapidly restore services without re-dialing up
HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
11 Multi-node Backup Configuration
Issue 02 (2014-09-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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