H3C Technologies H3C S7500E Series Switches - Manual (Page 73)

7-2
Basic Concepts in RRPP
Figure 7-1 RRPP networking diagram
RRPP domain
The interconnected devices 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, edge port, and so on.
As shown in Figure 7-1 , 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 of level 0, while 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 two states:
z Health state: All the physical links on the Ethernet ring are connected.
z Disconnect state: Some physical links on the Ethernet ring are broken.
As shown in Figure 7-1 , 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
1) Control VLAN
In an RRPP domain, a control VLAN is a VLAN dedicated to transferring Rapid Ring Protection
Protocol 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.