H3C S9500E Series Configuration Manual page 48

RRPP domain
Interconnected switches with the same domain ID and control VLANs constitute an RRPP domain.
An RRPP domain contains the following elements: primary ring, subring, control VLAN, master
node, transit node, primary port, secondary port, common port, and edge port.
As shown in Figure 7, Domain 1 is an RRPP domain, including two RRPP rings: Ring 1 and Ring
2. All the nodes on the two RRPP rings belong to the RRPP domain.
RRPP ring
A ring-shaped Ethernet topology is called an RRPP ring. RRPP rings fall into two 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 level 0, while a subring is level 1. An RRPP domain contains
multiple RRPP rings, one serving as the primary ring and the others serving as subrings. A ring
can be in one of the following two 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 7, Domain 1 contains two RRPP rings: Ring 1 and Ring 2. The level of Ring 1
is set to 0, that is, Ring 1 is configured as the primary ring; the level of Ring 2 is set to 1, that is,
Ring 2 is configured as a subring.
Control VLAN and data VLAN
Control VLAN
1.
In an RRPP domain, a control VLAN is a VLAN dedicated to transferring RRPPDUs. On a
switch, 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.
Data VLAN
2.
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 switch on an RRPP ring is referred to as a node. The role of a node is configurable.
RRPP ring 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.
48