Huawei NetEngine80E Configuration Manual - Reliability page 333

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
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Changing Detection Parameters Dynamically
After a BFD session is set up, detection parameters, such as the minimum sending interval,
minimum receiving interval, or detecting mode, can be changed without affecting the current
session status.
Binding a VPN Instance
On the NE80E/40E, a BFD session is bound to a VPN instance, allowing BFD Control packets
to be forwarded in a specified VPN.
Usage Scenario of BFD
The following
Table 5-1 The Usage Scenario of BFD
BFD for
everything
BFD for default-
ip
Issue 02 (2014-09-30)
– When the BFD session is Up, the BFD status on the interface bound to the BFD session
also goes Up.
This function helps the BFD detection results be reported more rapidly to an application.
Association between the BFD status and the status of a sub-interface of a main interface
bound to which the BFD session is bound
The BFD session must be bound to the main interface.
– If the BFD session goes Down, the BFD statuses on the bound interface and all sub-
interfaces go Down. The status change is reported to the application on the sub-interface.
The services such as L2VPN configured on the sub-interface use detection results of
the BFD session.
– If the BFD session goes Up, the BFD statuses on the interface to which the BFD session
is bound to and all the sub-interfaces also go Up.
This function saves the session resources in the system and provides reliability for more
applications. This function is typically used on the network where high reliability is required
and a great number of services are configured on the sub-interface, such as a large-scale
MAN Ethernet.
Table 5-1 give the usage scenario that bfd support.
Usage Scenario
A single-hop BFD session rapidly
detects faults on direct links over a
network. If the link interface is a
Layer 3 physical interface or Layer
2 interface that does not have an IP
address, configure static BFD for
default-ip for link detection.
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5 BFD Configuration
Configuration Reference
Configuring Single-hop BFD
316