R3102-R3103-HP 6600/HSR6600 Routers High Availability Configuration Guide

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RRPPDUs
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.
Table 18 RRPPDU types and their functions
Type
Description
Hello
The master node initiates Hello packets to detect the integrity of a ring in a
network.
Link-Down
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.
Common-Flush-FDB
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.
Complete-Flush-FDB
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.
Edge-Hello
The edge node initiates Edge-Hello packets to examine the SRPTs between the
edge node and the assistant-edge node.
Fast-Edge-Hello
The edge node initiates Fast-Edge-Hello packets to fast examine the SRPTs between
it and the assistant-edge node.
Major-Fault
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.
RRPP timers
When RRPP checks the link state of an Ethernet ring, the master node sends Hello packets out of 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 of the
primary port.
 The Fail timer specifies the maximum delay between the master node sending Hello packets out
of 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 Health state. Otherwise, the ring transits into 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.