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31.1.3 MRPP Protocol Operation System
1. Link Down Alarm System
When transfer node finds themselves belonging to MRPP ring port Down, it sends link Down packet to
primary node immediately. The primary node receives link down packet and immediately releases block
state of secondary port, and sends LINK-DOWN-FLUSH-FDB packet to inform all of transfer nodes,
refreshing own MAC address forward list.
2. Poll System
The primary port of primary node sends Hello packet to its neighbors timely according to configured
Hello-timer.
If the ring is health, the secondary port of primary node receives health detect packet, and the primary node
keeps secondary port.
If the ring is break, the secondary port of primary node can't receive health detect packet when timer is over
time. The primary releases the secondary port block state, and sends LINK-DOWN-FLUSH_FDB packet to
inform all of transfer nodes, to refresh own MAC address forward list.
3. Ring Restore
After the primary node occur ring fail, if the secondary port receives Hello packet sending from primary
node, the ring has been restored, at the same time the primary node block its secondary port, and sends its
neighbor LINK-UP-Flush-FDB packet.
After MRPP ring port refresh UP on transfer node, the primary node maybe find ring restore after a while.
For the normal data VLAN, the network maybe forms a temporary ring and creates broadcast storm. To
avoid temporary ring, transfer node finds it to connect to ring network port to refresh UP, immediately block
temporarily (only permit control VLAN packet pass), after only receiving LINK-UP-FLUSH-FDB packet from
primary node, and releases the port block state.
31.2 MRPP Configuration Task List
1) Globally enable MRPP
2) Configure MRPP ring
3) Display and debug MRPP relevant information
1) Globally enable MRPP
Global Mode
mrpp enable
no mrpp enable
Command
Explanation
Globally enable and disable MRPP.
31-10
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Troubleshooting
