7705 SAR Interfaces
90
Interface Configuration Guide
3HE 11011 AAAC TQZZA Edition: 01
3.2.9.2.1 CFM Loopback Overview
Connectivity fault management (CFM) loopback support for loopback messages
(LBMs) on Ethernet ports allows operators to run standards-based Layer 1 and Layer
2 OAM tests on ports receiving unlabeled packets.
The 7705 SAR supports CFM MEPs associated with different endpoints (that is,
spoke SDP Down MEPs, network interface facility MEPs, and SAP Up and SAP
Down MEPs). In addition, for traffic received from an uplink (network ingress), the
7705 SAR supports CFM LBM for both labeled and unlabeled packets. CFM
loopbacks are applied to the Ethernet port.
Refer to the 7705 SAR OAM and Diagnostics Guide, “Ethernet OAM Capabilities”,
for information on CFM MEPs.
Figure 7 shows an application where an operator leases facilities from a transport
network provider in order to transport traffic from a cell site to their MTSO. The
operator leases a certain amount of bandwidth between the two endpoints (the cell
site and the MTSO) from the transport provider, who offers Ethernet Virtual Private
Line (EVPL) or Ethernet Private Line (EPL) PTP service. Before the operator offers
services on the leased bandwidth, the operator runs OAM tests to verify the SLA.
Typically, the transport provider (MEN provider) requires that the OAM tests be run
in the direction of (towards) the first Ethernet port that is connected to the transport
network. This is done in order to eliminate the potential effect of queuing, delay, and
jitter that may be introduced by a spoke SDP or SAP.
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