ETH-CFM (802.1ag and Y.1731)
Page 78 7705 SAR OS Services Guide
• transparent pass-through of upper layer CFM messages
→ MD of the CFM messages that are higher than the one configured on the
7705 SAR
MIP functionality (that is, forwarding of CFM messages with the same MD level) is not
supported in Release 3.0 of the 7705 SAR. Only Down MEP functionality is supported on
Ethernet spoke SDPs (that is, termination of CFM messages that are ingress from the
Ethernet PW, or generation of CFM packets that are destined for the SR spoke SDP MEP-
ID).
In Figure 16, assuming that the MEP is enabled both on the SR and the 7705 SAR spoke
SDP endpoints, the 7705 SAR can generate CFM messages and can terminate any received
CFM messages that are destined for the 7705 SAR MEP-ID and have a matching configured
domain. Any 7705 SAR-generated CFM packets would traverse the Ethernet PW and would
be processed first by the SR node. The Ethernet PW running between the 7705 SAR and the
SR generates a pipe-like connectivity; thus, no intermediate Ethernet node can process the
CFM messages. All the CFM messages are transported over Ethernet PWs, and PW
termination only takes place on SR and 7705 SAR endpoints.
Figure 16: Dot1ag Down MEPs on Spoke SDPs
Metro Ethernet
NW
BTS
20476
7705 SAR
MEN
BSC
7750 SR
MEN
A
Ports
MEP
MEP
B C DEFGH I J K L
Ethernet (virtual) private line
Physical link
Ethernet PW
Legend:
Network Layer
(IP/MPLS)
dot1ag
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