Ring Initialization For Shared Interfaces; How Ring Breaks Are Detected And Healed Between Shared Interfaces - Dell PowerConnect B-RX Configuration Manual

14

Ring initialization for shared interfaces

Ring initialization for shared interfaces
FIGURE 72
For example, in
all nodes on Ring 2 is 2. Port 1/1 on node S1 and Port 2/2 on S2 have the IDs of 1 and 2 since the
interfaces are shared by Rings 1 and 2.
The ring's ID is also used to determine an interface's priority. Generally, a ring's ID is also the ring's
priority and the priority of all interfaces on that ring. However, if the interface is shared by two or
more rings, then the highest priority (lowest ID) becomes the priority of the interface. For example,
in Figure
a priority of 1. Likewise, all interfaces on Ring 2, except for Port 1/1 on node S1 and Port 2/2 on
node S2 have a priority of 2. Port 1/1 on S1 and Port 2/2 on S2 have a priority of 1 since 1 is the
highest priority (lowest ID) of the rings that share the interface.
If a node has interfaces that have different IDs, the interfaces that belong to the ring with the
highest priority become regular ports. Those interfaces that do not belong to the ring with the
highest priority become tunnel ports. In
Rings 1 and 2. Those interfaces with a priority of 1 are regular ports. The interfaces with a priority
of 2 are the tunnel ports since they belong to Ring 2, which has a lower priority than Ring 1.
How ring breaks are detected and healed between
shared interfaces
If the link between shared interfaces breaks, the secondary interface on Ring 1's master node
changes to a preforwarding state. The RHP packet sent by port 3/1 on Ring 2 is forwarded through
the interfaces on S4, then to S2. The packet is then forwarded through S2 to S3, but not from S2 to
S1 since the link between the two nodes is not available. When the packet reaches Ring 1's master
414
Interface IDs and types
1
1
C = customer port
Figure 72, the ID of all interfaces on all nodes on Ring 1 is 1 and all interfaces on
72, all interfaces on Ring 1, except for Port 1/1 on node S1 and Port 2/2 on node S2 have
1 2
1 T
2
1
S1
1,2 port1/1
Ring 2
Ring 1
port2/2
1,2
S2
1
2
T
1
1
2
Figure 72, nodes S1 and S2 have interfaces that belong to
2
2
2
2
BigIron RX Series Configuration Guide
53-1002253-01