Huawei NetEngine80E Configuration Manual - Reliability page 486

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
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Fault Association
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Issue 02 (2014-09-30)
Fault verification
– 802.1ag MAC ping
Similar to ping, 802.1ag MAC ping works by sending test packets and waiting for a
reply to test whether the destination device is reachable. 802.1ag MAC ping is initiated
by a MEP and destined for a MEP or MIP within an MA.
– GMAC ping
GMAC ping works similarly to 802.1ag MAC ping. A MEP, however, is not required
to initiate GMAC ping. The destination node does not need to be a MEP or a MIP.
GMAC ping can be implemented without configuring the MD, MA, or MEP on the
source device, the intermediate device, and the destination device.
– PBB-TE Ping
The Provider Backbone Bridging-Traffic Engineering (PBB-TE) ping operation is
performed to detect connectivity of the PBB-TE tunnel.
Fault location
– 802.1ag MAC trace
Similar to traceroute or tracert, 802.1ag MAC trace works by sending test packets and
waiting for a reply to test the path between the local device and the destination device
and to locate faults. 802.1ag MAC trace is initiated by a MEP and destined for a MEP
or MIP within an MA.
– GMAC trace
GMAC trace works similarly to 802.1ag MAC trace. A MEP, however, is not required
to initiate GMAC trace. The destination node does not need to be a MEP or a MIP. That
is, GMAC trace can be implemented without configuring the MD, MA, or MEP on the
source device, the intermediate device, and the destination device. All the intermediate
devices can respond with a Linktrace Reply (LTR).
– PBB-TE MAC trace
PBB-TE MAC trace locates the connectivity fault on the PBB-TE tunnel. PBB-TE MAC
trace is initiated by one end of the PBB-TE tunnel and destined for the other end.
Association between Ethernet CFM and an interface
When a MEP detects a connectivity fault between the MEP and a specified RMEP within
the same MA, the OAM management module performs the restart function, that is, shuts
down the interface on which the MEP resides for seven seconds and then starts it.
Association between Ethernet CFM and EFM
When the Ethernet CFM module detects a fault in an MA, the OAM management module
sends fault messages to the peer device enabled with EFM through the interface. When the
EFM module detects a fault, the OAM management module sends fault messages to the
MA through the interface.
– Ethernet CFM sends fault messages to EFM.
– EFM sends fault messages to Ethernet CFM.
– Ethernet CFM and EFM perform bidirectional transmission of fault messages.
Association between Ethernet CFM and Ethernet CFM
When the Ethernet CFM module detects a fault in an MA, the OAM management module
sends fault messages to the MA at the other side through the binding relationship.
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8 Ethernet OAM Configuration
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