Services Overview
7705 SAR OS Services Guide Page 79
Y.1731 MEP Support on Ethernet SAPs
As shown in Figure 17, the 7705 SAR supports Y.1731 Up and Down MEPs on Ethernet
SAPs that are bound to an Ethernet PW service.
Figure 17 also shows an 802.1ag Down MEP on an Ethernet spoke SDP in order to illustrate
that when performing CFM tests on the 7705 SAR, a Y.1731 Up MEP on an Ethernet SAP
should be used instead of an 802.1ag Down MEP on an Ethernet spoke SDP. Using a Y.1731
SAP Up MEP means that CFM packets verify the switching fabric and SAP status before the
packet is processed, because the SAP is on the access side of the 7705 SAR whereas a spoke
SDP is on the network side. If a spoke SDP Down MEP is used, packets are terminated and
extracted on the network side without being switched through the switching fabric.
Figure 17: Y.1731 MEP Support on the 7705 SAR
A
Ports
BCDEFGHIJKL
Metro Ethernet
NW
BTS
20849
7705 SAR
BSC
7750 SR
Ethernet (virtual) private line
Physical link
Ethernet PW
Legend:
Y.1731 SAP
Down MEP
Y.1731 SAP
Up MEP
802.lag
Spoke SDP
Down MEP
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