Huawei NetEngine80E Configuration Manual - Reliability page 403

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
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EFM OAM Extension
Generally, a CE accesses an IP network by connecting the two PEs in master/slave mode. This
can ensure the reliability of IP services. To be specific, the CE usually accesses the two PEs in
a Router Redundancy Protocol (VRRP) backup group. The VRRP access, however, is originally
designed for PC terminals, and therefore cannot guarantee the carrier-class reliability and
performance.
Ethernet in the First Mile, Operation, Administration and Maintenance (EFM OAM), a link-
detecting technology operative either on Layer 3 networks, such as the IP and MPLS, or Layer
2 networks, such as Provider Backbone Transport-Traffic Engineering (PBT-TE), Transport
MPLS (T-MPLS), and Virtual Private LAN Service (VPLS), is currently supported on various
vendors' devices.
An EFM OAM extension Protocol Data Unit (PDU) carries the flag bit that indicates the link
state. The router that receives the PDU can control the status of the access link according to the
flag bit. By associating EFM OAM extension with interfaces or static routes, you can control
the traffic flow and achieve the primary/bypass link failover, which can ensure the carrier-class
reliability in network access.
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Issue 02 (2011-09-10)
– EFM OAM and BFD perform bidirectional transmission of fault messages.
Association between EFM OAM and MPLS OAM
When the EFM OAM module detects a fault, the OAM management module sends fault
messages to MPLS OAM through the interface. When MPLS OAM detects a fault, the
OAM management module sends fault messages to EFM OAM through the interface.
– EFM OAM sends fault messages to MPLS OAM.
– MPLS OAM sends fault messages to EFM OAM.
As shown in Figure 8-1.
Figure 8-1 Networking diagram of EFM OAM extension for VRRP
RouterA
interface IP
UNI interface
by EFM OAM
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Copyright © Huawei Technologies Co., Ltd.
IP/MPLS
VLANIF/VPLS
VRRP
link detection
extension
SoftX
8 Ethernet OAM Configuration
RouterB
interface IP
link detection
by EFM OAM
extension
Master link
Slave link
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