Characteristics Of The Interface Backup Supported By The Ne80E/40E - Huawei NetEngine80E Configuration Manual - Reliability

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
Standby Interface
The standby interface does not transmit services and is often in the standby mode. The standby
interface backs up the active interface, such as if1 and if3 in
Any physical interface (POS , AUX Ethernet or ATM interface for example) on a router serves
as a standby interface.
2.1.2 Characteristics of the Interface Backup Supported by the
NE80E/40E
Interface backup can be performed in active/standby mode or load balancing mode.
Active/Standby Mode
Figure 2-2
Figure 2-2 Active/standby mode
In the active/standby mode, only one interface transmits services transmission all the time.
l
l
l
Load-Balancing Mode
In the load-balancing mode, the interfaces share the flow.
l
Issue 02 (2011-09-10)
NOTE
l An active interface is backed up by several standby interfaces. When the active interface fails, the
standby interface with the highest priority takes over services from the active interface.
l The same standby interface backs up only one active interface.
l ISDN BRI/PRI interfaces that have multiple physical channels provide backup for multiple active
interfaces through the Dialer route in the Dial Control Center (DCC) configuration.
shows that if2 serves as the active interface.
LAN
When the active interface works normally, all traffic flows pass through the active interface;
the standby interfaces like if1 and if3 remain in the standby mode even if the active interface
is overloaded.
The standby interface with the highest priority takes over the work of the active interface
and transmits all traffic flows only when the active interface fails.
When the failed active interface is restored, it transmits traffic again.
When the data flow of the active interface reaches the specified upper limit, the router
automatically enables an available standby interface with the highest priority. Both
interfaces undertake the transmission together and share the load.
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if1
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if2 if4
if3
2 Interface Backup Configuration
Figure 2-1.
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