HP 5130 EI Switch Series, Руководство по настройке, Страница: 57 / 171

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Type Description
Edge-Hello
The edge node initiates Edge-Hello packets to examine the SRPTs between the edge
node 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 assistant edge node and edge node is disconnected.
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
Figure 17 , Ring 1 is configured as the primary ring of Domain 1 and Domain 2, which are
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.