Ericsson ECN330, User Manual

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Configuring the ECN330-switch
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If the ring is complete, the master node prevents a loop by logically
blocking all data traffic in the transmit and receive directions on its
secondary port. If the master node subsequently detects a break in the
ring, it unblocks its secondary port and allows data traffic to be
transmitted and received through it.
The secondary port must be removed from an EAPS domain, before
specifying a new secondary port.
• Hello Timer (1-3 secs) – The interval at which the master node sends
hello-check packets. (Default: 1 second)
The hello time should be set on the master node. Once set, the master
node will send a hello-check packet at the interval specified by this timer
to all transit nodes. The transit nodes check for a health-check packet at
the interval specified by the fail time.
• Fail Timer (3-9 secs) – The interval after which a node declares a link
down if no hello-check packet is received. (Default: 3 seconds)
The fail time should be set on the master node. Once set, the master
node will send the newly configured fail time to all transit nodes, forcing
each node to update its fail timer. The transit nodes then check for a
health-check packet at the interval specified by the fail time, and report
a link down event to the master node if a health-check packet is not
received during this interval.
On transit nodes, the default value for the fail time can be used until
receiving a control message from the master node to update their
timers.
• EAPS Mode – This parameter configures the ECN330-switch as a
master node or transit node on the ring.
• Master – The master node is the control node of the EAPS domain.
This node actively monitors ring integrity and sends health check
and state change messages to transit nodes. Only one master node
can be set for a domain.
• Transit – Transit nodes receive master control messages, detect
ring topology changes, and send status messages to the master
node. The transit node also receives control messages from the
master node to synchronize the hello and fail timers. Note that all
other configuration parameters for a transit node should be
configured to be the same as that the EAPS domain’s master node.