Huawei NetEngine80E Configuration Manual - Reliability page 331

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
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One-arm Echo Function
If BFD-capable device is directly connected to a BFD-incapable device, a BFD session with the
one-arm Echo function is configured on the BFD-capable device to rapidly detect a fault in a
link between the two devices. The BFD-capable device initiates a request by sending a BFD
Echo packet to the BFD-incapable device. After receiving the packet, the BFD-incapable device
directly loops back the packet, allowing BFD to detect faults in the direct link between the two
devices.
Issue 02 (2014-09-30)
NOTE
IP-Trunk cannot be configured on the X1 and X2 models of the NE80E/40E.
Layer 3 physical interfaces
Ethernet sub-interfaces (including Eth-Trunk sub-interfaces)
If a physical Ethernet interface has multiple sub-interfaces, BFD sessions are separately
set up on the physical Ethernet interface and every sub-interface.
Sub-interfaces for Dot1q VLAN tag termination and sub-interfaces for QinQ VLAN tag
termination
IP-Trunk
– IP-Trunk link
– IP-Trunk member link
Separate BFD sessions can be established to detect faults on an IP-Trunk interface and its
member interfaces.
Eth-Trunk
– Layer 2 Eth-Trunk link
– Layer 2 Eth-Trunk member link
– Layer 3 Eth-Trunk link
– Layer 3 Eth-Trunk member link
Separate BFD sessions can be established to detect faults on an Eth-Trunk and its member
interfaces.
NOTE
l Both IP-Trunk and Eth-Trunk links are composed of member links, providing high bandwidth and
reliability.
l When the number of trunk member links that are Up reaches a certain value, the trunk link keeps Up.
l For information about the IP-Trunk configuration, refer to the HUAWEI NetEngine80E/40E Router
Configuration Guide - WAN Access; for information about the Eth-Trunk configuration, refer to the
HUAWEI NetEngine80E/40E Router Configuration Guide - LAN Access and MAN Access.
VLANIF
– Ethernet member links in a VLAN
– VLANIF interface
BFD sessions are separately created on a VLANIF interface and its VLANIF member
interfaces to detect faults in the VLANIF and VLANIF member interfaces simultaneously.
NOTE
The one-arm Echo function is applicable to only single-hop BFD sessions.
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