Huawei Quidway S3700 Series Configuration Manual page 62

Quidway S3700 Series Ethernet Switches
Configuration Guide - Reliability
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Hello Timer and Fail Timer
When RRPP detects the link status on the Ethernet ring, the master node sends Hello packets
according to the Hello timer and determines whether the secondary interface receives the Hello
packets according to the Fail timer.
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RRPP Multi-Instance
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Issue 01 (2011-10-26)
Different from a control VLAN, a data VLAN is used to transmit data packets. The data
VLAN can contain both the RRPP ports and non-RRPP ports.
Master node
On an Ethernet ring, each switch is called a node. Each RRPP ring must have only one
master node.
Transit node
On an RRPP ring, all nodes except the master node are transit nodes.
A transit node monitors the status of its directly connected RRPP links. When the link status
changes, the transit node informs the master node. The master node then determines the
policy for reacting to the change of the link status.
Edge node and assistant edge node
An edge node or assistant edge node is configured on a subring. It functions as a transit
node on the major ring.
On a subring, either of the two nodes that are on the crossed points of the major ring and
subring can be configured as the edge node. A subring must have only one edge node. Then,
the other node is the assistant edge node.
Primary interface and secondary interface
On the master node and transit nodes, you can configure one of the two interfaces connected
to the Ethernet ring as the primary interface and the other as the secondary interface.
Common interface and edge interface
On an edge node or an assistant edge node, the interface shared by the subring and major
ring is called the common interface. An interface located only on a subring is called an
edge interface.
The value of the Hello timer specifies the interval at which the master node sends Hello
packets from the primary interface.
The Fail timer specifies the maximum interval between two Hello packets received on the
secondary interface.
Multi-instance
In the RRPP networking, one RRPP ring contains only one master node. When the master
node is in Complete state, the blocked secondary interface rejects all the data packets. In
this manner, all the data packets are transmitted through the same path on the RRPP ring.
The link of the secondary interface on the master node is idle, which wastes bandwidth.
The RRPP multi-instance feature is implemented based on domains. In the RRPP domain,
all the interfaces, nodes, and topologies conform to the RRPP principle. In the RRPP multi-
instance networking, multiple domains can be configured on an RRPP ring.
Each domain contains one or more instances, and each instance represents a VLAN range.
The VLANs in a domain are protected VLANs in the RRPP domain. A protected VLAN
can be a data VLAN, the control VLAN on the major ring, or the control VLAN on a subring
in the RRPP domain.
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3 RRPP Configuration
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