H3C S9500E Series Configuration Manual page 49

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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.
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Edge node: A node residing on both the primary ring and a subring at the same time. An
edge node is a special transit node that serves as a transit node on the primary ring and an
edge node on the subring.
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Assistant-edge node: A node residing on both the primary ring and a subring at the same
time. An assistant-edge node is a special transit node that serves as a 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 7 on Page 47, 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 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.
Primary port and secondary port
Each master node or transit node has two ports connected to an RRPP ring, one serving as the
primary port and the other serving as the secondary port. You can determine the role of a port.
In terms of functionality, the difference between the primary port and the secondary port of a
1.
master node is:
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The primary port and the secondary port are designed to play the role of sending and
receiving loop-detect packets respectively.
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When an RRPP ring is in Health state, the secondary port of the master node will
logically deny data VLANs and permit only the packets of the control VLANs.
○
When an RRPP ring is in Disconnect state, the secondary port of the master node will
permit data VLANs, that is, forward packets of data VLANs.
In terms of functionality, there is no difference between the primary port and the secondary
2.
port of a transit node. Both are designed for transferring protocol packets and data packets
over an RRPP ring.
As shown in Figure 7 on Page 47, Device A is the master node of Ring 1. Port 1 and Port 2 are
the primary port and the secondary port of the master node on Ring 1 respectively. Device B,
Device C, and Device D are the transit nodes of Ring 1. Their Port 1 and Port 2 are primary ports
and secondary port on Ring 1 respectively.
Common port and edge port
The ports connecting the edge node and assistant-edge node to the primary ring are common
ports. The ports connecting the edge node and assistant-edge node only to the subrings are edge
ports.
As shown in Figure 7, Device B and Device C lie on Ring 1 and Ring 2. Device B's Port 1 and
Port 2 and Device C's Port 1 and Port 2 access the primary ring, so they are common ports.
Device B's Port 3 and Device C's Port 3 access only the subring, so they are edge ports.
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