H3C Technologies H3C S12500 Series Switches - Manual (Page 67)

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RRPP ring
A ring-shaped Ethernet topology is called an "RRPP ring". RRPP rings include the following types:
primary ring and subring. You can configure a ring as either the primary ring or a subring by specifying
its ring level. The primary ring is of level 0, and a subring is of level 1. An RRPP domain contains one or
multiple RRPP rings, one serving as the primary ring and the others serving as subrings. A ring can be in
one of the following states:
• Health state—All the physical links on the Ethernet ring are connected
• Disconnect state—Some physical links on the Ethernet ring are broken
As shown in Figure 11 , Domain 1 contains two RRPP rings: Ring 1 and Ring 2. The level of Ring 1 is set
to 0, and that of Ring 2 is set to 1. Ring 1 is configured as the primary ring, and Ring 2 is configured as
a subring.
Control VLAN and data VLAN
1. Control VLAN
In an RRPP domain, a control VLAN is a VLAN dedicated to transferring RRPP data units (RRPPDUs).
On a device, the ports accessing an RRPP ring belong to the control VLANs of the ring, and only
such ports can join the control VLANs.
An RRPP domain is configured with two control VLANs: one primary control VLAN, which is the
control VLAN for the primary ring; one secondary control VLAN, which is the control VLAN for
subrings. All subrings in the same RRPP domain share the same secondary control VLAN. After you
specify a VLAN as the primary control VLAN, the system automatically configures the VLAN whose
ID is the primary control VLAN ID plus one as the secondary control VLAN.
IP address configuration is prohibited on the control VLAN interfaces.
2. Data VLAN
A data VLAN is a VLAN dedicated to transferring data packets. Both RRPP ports and non-RRPP
ports can be assigned to a data VLAN.
Node
Each device on an RRPP ring is a node. The role of a node is configurable. RRPP has the following node
roles:
• Master node—Each ring has one and only one master node. The master node initiates the polling
mechanism and determines the operations to be performed after a change in topology.
• Transit node—Transit nodes include all nodes except the master node on the primary ring and all
nodes on subrings except the master nodes and the nodes where the primary ring intersects with the
subrings. A transit node monitors the state of its directly-connected RRPP links and notifies the master
node of the link state changes, if any. Based on the link state changes, the master node decides the
operations to be performed.
• Edge node—A special node residing on both the primary ring and a subring at the same time. An
edge node serves as a master node or transit node on the primary ring and an edge node on the
subring.
• Assistant-edge node—A special node residing on both the primary ring and a subring at the same
time. An assistant-edge node serves as a master node or transit node on the primary ring and an
assistant-edge node on the subring. This node works in conjunction with the edge node to detect the
integrity of the primary ring and perform loop guard.
As shown in Figure 11 , Ring 1 is the primary ring and Ring 2 is a subring. Device A is the master node
of Ring 1, Device B, Device C and Device D are the transit nodes of Ring 1. Device E is the master node
of Ring 2, Device B is the edge node of Ring 2, and Device C is the assistant-edge node of Ring 2.