Configuring the ECN330-switch
2631553-KDU 137 365 Uen D 2006-06-16
• 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 fair 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
master node enters failed state and sends a control message to make
all transit nodes flush their FDB.
• Handling EAPS control message events: Control messages are sent to
nodes on the domain ring to maintain ring status. The master node
sends health-check packets to ensure that the domain ring is
unchanged. The master node sends RING-DOWN-FLUSH-FDB and
RING-UP-FLUSH-FDB messages to inform the transit nodes to flush
their FDB. Transit nodes sends a link-down message to the master node
to make master enter failed state immediately.
Note: The port MAC address, not the system MAC address, is used as the
source address for all EAPS protocol packets.
Configuration Limitations for EAPS
The following configuration limitations apply to EAPS:
• One ECN330-switch only supports two EAPS domains – each domain
must have one control VLAN and at most nine Protected VLANs.
• Either Gigabit Ethernet or Fast Ethernet ports can be configured as
EAPS ring ports, but these ports should not be a member of any trunk.
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