H3C S7500 Series Operation Manual page 939

Operation Mannual – RRPP
H3C S7500 Series Ethernet Switches
1. Switch B and Switch C are edge nodes because they are both on ring 2. You can
specify one of them as an edge node, and the other as an assistant edge node.
V. Primary port and secondary port
The master node and each of the transit nodes are connected to an Ethernet ring
through two ports, of which one is the primary port and the other is the secondary port.
The node roles are determined by user configuration.
The primary port and secondary port of the master node
The primary port of the master node transmits the loop detection packet, and the
secondary port of the master node receives the loop detection packet.
When an Ethernet ring is in the healthy state, the secondary port of the master node
allows only RRPP packets to pass, but logically blocks data packets in data VLANs.
When the Ethernet ring is in the broken state, the secondary port of the master node
stops blocking the data VLAN and begins to forwards data packets in data VLANs.
The primary and secondary ports of a transit node are functionally the same.
The node roles are determined by user configuration. As shown in
is the master node of Ring 1. Port 1 and Port 2 of Switch A are the primary port and
secondary port respectively. Switch B, Switch C, and Switch D are the transit nodes on
ring 1, and their respective port 1 and port 2 are the primary port and secondary port on
ring 1.
Subring protocol messages are processed as data packets in the primary ring. Thus,
when the secondary port on the master node of the primary ring, or the RRPP ports
(including the primary and secondary ports) on the transit node are blocked, both data
packets and subring protocol messages cannot pass through the port. After the ports
are unblocked, these packets or messages can pass through the ports.
VI. Common port and edge port
Of the two ports connecting an edge node (or assistant edge node) to a subring, one is
the common port and the other is the edge port of the node. The common port connects
the edge node to the primary ring and a subring at the same time. An edge port is
connected only with a subring.
Conceptually, a common port is not treated as a port on the subring. Instead, it is a part
of the primary ring. In another word, the common link is a link on the primary ring
instead of the subring. Status change of a public link is only reported to the master node
of the primary ring and the master node of the subring needs not know about the
change.
The node roles are determined by user configuration. As shown in
and Switch C are on ring 1 and ring 2 at the same time. Port 2 of Switch B and Port 1 of
Switch C connect the primary and a subring, so they are common ports. Port 3 of
Switch B and Port 3 of Switch C connect only the subring, so they are edge ports.
1-3
Chapter 1 RRPP Configuration
Figure 1-1, Switch A
Figure 1-1, Switch B