H3C Technologies H3C S12500 Series Switches - Manual (Page 68)

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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.
1. In terms of functionality, the primary port and the secondary port of a master node have the
following differences:
{
The primary port and the secondary port are designed to play the role of sending and receiving
loop-detect packets, respectively.
{
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 from the control VLANs.
{
When an RRPP ring is in Disconnect state, the secondary port of the master node will forward
packets from data VLANs.
2. In terms of functionality, the primary port and the secondary port of a transit node are the same.
Both are designed for transferring protocol packets and data packets over an RRPP ring.
As shown in Figure 11 , 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 the primary port and the 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 11 , 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.
RRPP ring group
To reduce Edge-Hello traffic, you can configure a group of subrings on the edge node or assistant-edge
node. For more information about Edge-Hello packets, see " RRPPDUS ." You must configure a device as
the edge node of these subrings, and another device as the assistant-edge node of these subrings.
Additionally, the subrings of the edge node and assistant-edge node must connect to the same subring
packet tunnels in major ring (SRPTs), so that Edge-Hello packets of the edge node of these subrings travel
to the assistant-edge node of these subrings over the same link.
An RRPP ring group configured on the edge node is an edge node RRPP ring group, and an RRPP ring
group configured on an assistant-edge node is an assistant-edge node RRPP ring group. Up to one
subring in an edge node RRPP ring group is allowed to send Edge-Hello packets.
RRPPDUS
Table 18 RRPPDU types and their functions
Type Description
Hello
The master node initiates Hello packets to detect the integrity of a ring in a
network.
Fast-Hello
The master node initiates Fast-Hello packets to fast detect the integrity of a ring in
a network.