Brocade Multi-Service IronWare Administration Guide (Supporting R05.6.00) - Manual (Page 210)

192 Multi-Service IronWare Administration Guide
53-1003028-02
IEEE 802.3ah EFM-OAM
6
• Critical Event: When a critical event occurs, the device is unavailable as a result of malfunction,
and it is to be restarted by the user. The critical events can be sent immediately and
continually.
When the dying gasp or critical event occurs, the device driver will call a special API in the EFMOAM
implementation.
The link fault applies only when the physical sublayer is capable of independent transmission and
reception.
When a link receives no signal from its peer at the physical layer (for example, if the peer’s laser is
malfunctioning), the local entity sets this flag to let the peer know that its transmit path is
inoperable. The link-down API will be called by the device driver in order to notify the remote device
of the link fault.
Since the above conditions are severe, when they are set in the flag, the OAMPDU is not subject to
normal rate limiting policy.
Remote loopback
An OAM entity can put its remote entity into loopback mode using a loopback control OAMPDU. This
helps users ensure quality of links during installation or when troubleshooting. In loopback mode,
each frame received is transmitted back on that same port except for OAMPDUs and pause frames.
The periodic exchange of OAMPDUs must continue while in the loopback state to maintain the OAM
session. The loopback command is acknowledged by responding with an Information OAMPDU with
the loopback state indicated in the state field. This allows to estimate if a network segment can
satisfy an SLA.
Enabling and disabling EFM-OAM
The link-oam command, in Protocol Configuration mode, enables and disables the EFM-OAM
protocol and enters into the EFM-OAM Protocol Configuration mode. The link-oam disable and
enable command resets all link-oam parameters to default values.
By default, EFM-OAM is disabled.
To enable EFM-OAM, enter a command such as the following:
Brocade(config)link-oam
Brocade(config-link-oam)#enable
Syntax: [no]link-oam
Syntax: enable
The no form of the command sets the 802.3ah EFM-OAM to the disabled state.
Specifying the timeout value
The timeout command is a hold down timer that specifies the number of seconds before it declares
that the other side has stopped sending OAMPDUs.
Brocade(config-link-oam) #timeout 10
Syntax: [no] timeout value
The no form of the command restores the default value of 5 OAMPDUs.
The value parameter specifies the number of seconds before declaring the remote as down. in the
range of 1-10.