Operation Manual – RPR
H3C S9500 Series Routing Switches
Chapter 1 RPR Configuration
1-3
I. Unicast transmission
Transit
Strip
Strip
Transit
Copy from
ringlet 1
Copy from
ringlet 0
Insert to
ringlet 0
Insert to
ringlet 1
Transit
Strip
Figure 1-2
Unicast transmission on an RPR ring
Figure 1-2
shows how a unicast data frame is transmitted on an RPR ringlet:
1) Source station inserts the unicast frame into the data stream on Ringlet 0 or
Ringlet 1.
2)
Transit stations transit the frame.
3)
The frame is copied and stripped when it reaches the destination station or when
its time to live (TTL) expires.
Different from traditional ring technologies where unicast frames are removed from the
ring at the source station, RPR adopts destination stripping to remove unicast frames
from the ring at the destination station. This increases bandwidth utilization and spatial
bandwidth reuse efficiency.
II. Broadcast transmission
Copy from
ringlet 0
Copy from
ringlet 0
Copy from
ringlet 0
Copy from
ringlet 0
Strip
Strip
Insert to
ringlet 0
Figure 1-3
Broadcast/flooded transmission on an RPR ring
Figure 1-3
shows how a frame is flooded or broadcasted on an RPR ringlet:
1)
Source station inserts the frame into the data stream on Ringlet 0 or Ringlet 1.
