Rrppdus; Rrpp Timers - HP A5120 EI Configuration Manual

RRPPDUs

Table 17 RRPPDU types and their functions
Type
Hello
Link-Down
Common-Flush-FDB
Complete-Flush-FDB
Edge-Hello
Major-Fault
NOTE:
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.
NOTE:
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.
Description
The master node initiates Hello packets to detect the integrity of a ring in a
network.
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