Digisol DG-FS4528P, Management Manual

Page: 767 / 973

C
HAPTER
37 | EAPS Commands
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Functional Description
Setting port status on the master node: When the master node is in the
Complete state, the primary and secondary ports will be set to the
status described below. On the CVLAN, the secondary port will trap
control messages to the CPU and not forward them to any port. On
Protected VLANs, the secondary port will block all data flow except for
EAPS domain control messages.
Setting port status on the transit node: The port on the domain ring will
periodically receive a control message. This message is copied to the
CPU and forwarded to the next port on the domain ring. When the port
on the domain ring link changes from up to down, this port will be
temporarily blocked on the Protected VLANs. This port is opened on the
Protected VLANs again only when the transit node in “pre-forwarding”
state receives a control frame instructing it to flush its bridging table
and unblock the previously blocked protected VLANs.
Handling a hardware link down event: If this event occurs on the
primary port of the master node, the master node will unblock the
blocked port on the Protected VLAN and send a message to flush the
forwarding database (FDB) to all transit nodes. If this event occurs on
the secondary port, the master node will enter failed state. If this event
occurs on a transit node, the transit node will send a link down control
message to the master node, and the master node will unblock the
blocked port and send a control message to make the transit nodes
flush their FDB. The master node also enters the failed state.
Handling a hardware link up event: If this event occurs on the master
node, the secondary port will be blocked on the Protected VLAN, and
the master node will send a message to flush the FDB to all transit
nodes. If this event occurs on a transit node, the new linked port will be
blocked until it receives RING-UP-FLUSH-FDB message.
Handling health-check packet hello timer events: The master node
sends a health-check packet to ensure the ring status, and starts the
health-check packet fail timer at once.
Handling health-check packet fail timer events: If this event occurs, the
ring topology has changed, and the link down control message lost. The
Primar y Port
Secondar y Port
(blocked unless primar y ring fails)
Master
Health Messages