H3C Technologies H3C S7500E Series Switches - Manual (Page 75)

7-4
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 7-1 , 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 information about Edge-Hello packets, refer to 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 called an edge node RRPP ring group, and
an RRPP ring group configured on an assistant-edge node is called 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 7-1 shows the types of RRPPDUs and their functions.
Table 7-1 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.
Link-Down
The transit node, the edge node or the assistant-edge node initiates
Link-Down packets to notify the master node of the disappearance of a ring
in case of a link failure.
Common-Flush-FDB
The master node initiates Common-Flush-FDB (FDB stands for Forwarding
Database) packets to instruct the transit nodes to update their own MAC
entries and ARP/ND entries when an RRPP ring transits to Disconnect
state.
Complete-Flush-FDB
The master node initiates Complete-Flush-FDB packets to instruct the
transit nodes to update their own MAC entries and ARP/ND entries, and
release blocked ports from being blocked temporarily when an RRPP ring
transits to Health state.