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Figure 6-1
Basic mechanism of HSB
AMB
SMB
FIB
FIB
FIB
FIB
FIB
RIB
RPA MPLS
IFnet
IPC
FIB
RIB
RPA MPLS
IFnet
IPC
IPC
IPC
GR Capabiliby
Negotiation to support
Passive GR
Routing / MPLS Protocol
State Sync
Socket /TCP Link
Synchronize
configuration
and change
Heart Beat Check
Switch Fabric
Download
FIB
IO board
Interface
Incoming Packet
Outcoming Packet
When the system is restarted, the AMB backs up its static configurations on the SMB and the
SMB re-execute the static configurations.
When the system runs normally, any data changes in the AMB, including static and dynamic
data changes, are backed up to the SMB. Note that the AMB can download the routing
information from the data plane to the interface board but the SMB cannot download the routing
information. In addition, the SMB cannot receive any information from the interface board.
After the switchover, the SMB switches itself to the AMB and runs smoothly. All data on the
AMB is backed up; therefore, the sessions with other routers are not affected and other routers
are not aware of the switchover. That is, the HSB switchover is "self-contained".
The requirements for the hardware and software to implement the HSB are as follows:
l
Supporting two main boards that serve as the backup for each other
l
Providing a physical communication channel between the AMB and the SMB
l
Supporting AMB heart beat detection on hardware or software
The HSB performs the following functions:
l
Supporting backup of static configuration data from the AMB to the SMB
l
Supporting dynamic backup and update of protocol status data from the AMB to the SMB
l
Supporting the protocol-level GR capability
l
Supporting data smoothing between modules
HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
6 GR Configuration
Issue 02 (2014-09-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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