Interface Configuration Guide 7705 SAR Interfaces
Edition: 01 3HE 11011 AAAC TQZZA 83
3.2.8.1 Ethernet OAM Overview
802.3ah Clause 57 (EFM OAM) defines the Operations, Administration, and
Maintenance (OAM) sublayer, which is a link level Ethernet OAM that is supported
on 7705 SAR Ethernet ports and DSL ports configured as network or access ports.
It provides mechanisms for monitoring link operations such as remote fault indication
and remote loopback control. EFM OAM is not supported on the 7705 SAR-M GPON
module.
Ethernet OAM gives network operators the ability to monitor the status of Ethernet
links and quickly determine the location of failing links or fault conditions.
Because some of the sites where the 7705 SAR will be deployed will only have
Ethernet uplinks, this OAM functionality is mandatory. For example, mobile operators
must be able to request remote loopbacks from the peer router at the Ethernet layer
in order to debug any connectivity issues. EFM OAM provides this capability.
EFM OAM is supported on network and access Ethernet and DSL ports, and is
configured at the port level. The access ports can be configured to tunnel the OAM
traffic originated by the far-end devices.
EFM OAM has the following characteristics.
• All EFM OAM, including loopbacks, operate on point-to-point links only.
• EFM loopbacks are always line loopbacks (line Rx to line Tx). Line loopbacks
are not supported on DSL ports.
• When a port is in loopback, all frames (except EFM frames) are discarded. If
dynamic signaling and routing is used (dynamic LSPs, OSPF, IS-IS, or BGP
routing), all services also go down. If all signaling and routing protocols are static
(static routes, LSPs, and service labels), the frames are discarded but services
stay up.
The following EFM OAM functions are supported:
• OAM capability discovery
• configurable transmit interval with an Information OAMPDU
• active or passive mode
• OAM loopback
• OAMPDU tunneling and termination (for Epipe service)
• dying gasp at network and access ports
For information on Epipe service, refer to the 7705 SAR Services Guide, “Ethernet
VLL (Epipe) Services”, and the 7705 SAR OAM and Diagnostics Guide, “Ethernet
OAM Capabilities”.
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