Rrpp Timers; How Rrpp Works - HP A5830 series Configuration Manual

Type
Link-Down
Common-Flush-FDB
Complete-Flush-FDB
Edge-Hello
Major-Fault
RRPPDUs of subrings are transmitted as data packets in the primary ring, and RRPPDUs of the primary
ring can only be transmitted within the primary ring.

RRPP timers

When RRPP checks the link state of an Ethernet ring, the master node sends Hello packets out the
primary port according to the Hello timer and determines whether its secondary port receives the Hello
packets based on the Fail timer.
The Hello timer specifies the interval at which the master node sends Hello packets out the primary
•
port.
The Fail timer specifies the maximum delay between the master node sending Hello packets out the
•
primary port and the secondary port receiving the Hello packets from the primary port. If the
secondary port receives the Hello packets sent by the local master node before the Fail timer
expires, the overall ring is in the Health state. Otherwise, the ring transits into the Disconnect state.
In an RRPP domain, a transit node learns the Hello timer value and the Fail timer value on the master
node through the received Hello packets, ensuring that all nodes in the ring network are consistent in the
two timer settings.

How RRPP works

Polling mechanism
The polling mechanism is used by the master node of an RRPP ring to check the Health state of the ring
network.
The master node sends Hello packets out its primary port periodically, and these Hello packets travel
through each transit node on the ring in turn.
If the ring is complete, the secondary port of the master node will receive Hello packets before the
•
Fail timer expires and the master node will keep the secondary port blocked.
If the ring is torn down, the secondary port of the master node will fail to receive Hello packets
•
before the Fail timer expires. The master node will release the secondary port from blocking data
Description
The transit node, the edge node, or the assistant-edge node initiates Link-Down
packets to notify the master node of the disappearance of a ring in case of a
link failure.
The master node initiates Common-Flush-FDB (FDB stands for Forwarding
Database) packets to instruct the transit nodes to update their own MAC
entries and ARP/ND entries when an RRPP ring transits to Disconnect state.
The master node initiates Complete-Flush-FDB packets to instruct the transit
nodes to update their own MAC entries and ARP/ND entries and release
blocked ports from being blocked temporarily when an RRPP ring transits to
Health state.
The edge node initiates Edge-Hello packets to examine the SRPTs between the
edge node and the assistant-edge node.
The assistant-edge node initiates Major-Fault packets to notify the edge node
of SRPT failure when an SRPT between edge node and assistant-edge node is
torn down.
57