R3303-HP HSR6800 Routers High Availability Configuration Guide

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T
yp
e Descri
p
tion
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.
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 of 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
VLANs and sending Common-Flush-FDB packets to instruct all transit nodes to update their own
MAC entries and ARP/ND entries.