Figure 16: Dot1Ag Down Meps On Spoke Sdps - Alcatel-Lucent 7705 Service Manual

ETH-CFM (802.1ag and Y.1731)
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).
MEP
BTS
Ports
A B
Network Layer
(IP/MPLS)
Legend:
Ethernet (virtual) private line
Ethernet PW
Physical link
In
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.
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• transparent pass-through of upper layer CFM messages
→ MD of the CFM messages that are higher than the one configured on the
7705 SAR

Figure 16: Dot1ag Down MEPs on Spoke SDPs

7705 SAR
MEN
C D
Figure 16, assuming that the MEP is enabled both on the SR and the 7705 SAR spoke
Metro Ethernet
NW
MEN
E F G H
dot1ag
7705 SAR OS Services Guide
MEP
7750 SR
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BSC
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