Alcatel-Lucent 7750 - 802.3 Ah OAM

802.3ah OAM
Page 152 7750 SR Interface Configuration Guide
802.3ah OAM
802.3ah Clause 57 (efm-oam) defines the Operations, Administration, and Maintenance (OAM)
sub-layer, which provides mechanisms useful for monitoring link operation such as remote fault
indication and remote loopback control. In general, OAM provides network operators the ability to
monitor the health of the network and quickly determine the location of failing links or fault
conditions. efm-oam described in this clause provides data link layer mechanisms that
complement applications that may reside in higher layers.
OAM information is conveyed in slow protocol frames called OAM protocol data units
(OAMPDUs). OAMPDUs contain the appropriate control and status information used to monitor,
test and troubleshoot OAM-enabled links. OAMPDUs traverse a single link, being passed between
peer OAM entities, and as such, are not forwarded by MAC clients (like bridges or switches).
The following efm-oam functions are supported:
• efm-oam capability discovery.
• Active and passive modes.
• Remote failure indication — Handling of critical link events (link fault, dying gasp, etc.)
• Loopback — A mechanism is provided to support a data link layer frame-level loopback
mode. Both remote and local loopback modes are supported.
• efm-oam PDU tunneling.
• High resolution timer for efm-oam in 100ms interval (minimum).
• efm-oam kink monitoring
When the efm-oam protocol fails to negotiate a peer session or encounters a protocol failure
following an established session the Port State will enter the Link Up condition. This port state is
used by many protocols to indicate the port is administratively UP and there is physical
connectivity but a protocol, such as efm-oam, has caused the ports operational state to enter a
DOWN state. A reason code has been added to help discern if the efm-oam protocol is the
underlying reason for the Link Up condition.
show port
===============================================================================
Ports on Slot 1
===============================================================================
Port Admin Link Port Cfg Oper LAG/ Port Port Port C/QS/S/XFP/
Id State State MTU MTU Bndl Mode Encp Type MDIMDX
-------------------------------------------------------------------------------
1/1/1 Down No Down 1578 1578 - netw null xcme
1/1/2 Down No Down 1578 1578 - netw null xcme
1/1/3 Up Yes Link Up 1522 1522 - accs qinq xcme
1/1/4 Down No Down 1578 1578 - netw null xcme
1/1/5 Down No Down 1578 1578 - netw null xcme
1/1/6 Down No Down 1578 1578 - netw null xcme
# show port 1/1/3