Rrpp Timers; How Rrpp Works - HPE FlexFabric 5700 Series Configuration Manual

Type
Edge-Hello
Major-Fault

RRPP timers

When RRPP determines the link state of an Ethernet ring, it uses the following timers:
•
Hello timer—Specifies the interval at which the master node sends Hello packets out of the
primary port.
•
Fail timer—Specifies the maximum delay of Hello packets sent from the primary port to the
secondary port of the master node. If the secondary port receives the Hello packets sent by the
local master node before the Fail timer expires, the ring is in Health state. Otherwise, the ring
transits to Disconnect state.
In an RRPP domain, a transit node learns the Fail timer value on the master node through the
received Hello packets. This ensures that all nodes in the ring network have consistent Fail timer
settings.

How RRPP works

Polling mechanism
The polling mechanism is used by the master node of an RRPP ring to examine the Health state of
the ring network.
The master node sends Hello packets out of its primary port at the Hello interval. 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 receives Hello packets before the
Fail timer expires. The master node keeps the secondary port blocked.
•
If the ring is disconnected, the secondary port of the master node fails to receive Hello packets
before the Fail timer expires. The master node releases the secondary port from blocking data
VLANs. It sends Common-Flush-FDB packets to instruct all transit nodes to update their own
MAC address entries and ARP/ND entries.
Load balancing
In a ring network, traffic from multiple VLANs might be transmitted at the same time. RRPP can
implement load balancing by transmitting traffic from different VLANs along different paths.
You can configure multiple RRPP domains for a ring network. Each RRPP domain transmits the
traffic from the specified VLANs (protected VLANs). Traffic from different VLANs can be transmitted
according to different topologies in the ring network for load balancing.
As shown in
configured with different protected VLANs. Device A is the master node of Ring 1 in Domain 1.
Device B is the master node of Ring 1 in Domain 2. With such configurations, traffic from different
VLANs can be transmitted on different links for load balancing in the single-ring network.
Description
Complete-Flush-FDB packets for the following purposes:
•
Instruct the transit nodes, edge nodes, and assistant edge nodes to update
their MAC address entries and ARP/ND entries.
•
Instruct the transit nodes to release temporarily blocked ports.
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 assistant edge node and edge node is
disconnected.
Figure 17, Ring 1 is configured as the primary ring of Domain 1 and Domain 2, which are
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