ETH-CFM (802.1ag and Y.1731)
Page 76 7705 SAR OS Services Guide
MEP Support (802.1ag and Y.1731)
The 7705 SAR supports Up and Down maintenance association endpoints (MEPs) on
Ethernet SAPs for both 802.1ag and Y.1731. It also supports Down MEPs on Ethernet spoke
SDPs for 802.1ag only.
802.1ag MEP Support on Ethernet SAPs
The 7705 SAR supports Up and Down MEPs on Ethernet SAPs. Figure 14 shows that the
7705 SAR can terminate and respond to CFM messages received from connected devices,
such as base stations, when port B is a Down MEP on a SAP. A CFM message coming from
port A would be terminated on port B of the 7705 SAR. Conversely, port B on the
7705 SAR can generate and send a CFM message towards port A.
Figure 15 shows how a Down MEP on an Ethernet SAP might be used. In this example, an
Ethernet network connects to an access Ethernet port on the 7705 SAR and there are
multiple SAPs on that port (that is, multiple endpoints). Since CFM offers OAM capabilities
on a per-service basis, which in this case means per SAP (or endpoint), each service can run
CFM. Note that if BSC end devices were directly connected to the 7705 SAR (and a VLAN
was not used to separate services from each other), EFM would offer capabilities similar to
CFM for Ethernet OAM.
Figure 14: MEP on Ethernet Access
Metro Ethernet
NW
BTS
20474
7705 SAR
MEN
BSC
7750 SR
MEN
A
Ports
B C DEFGH I J K L
Ethernet (virtual) private line
Legend:
MEP
Physical link
To Next Page
Loading...
