HP 200 Series Services And Applications page 90

Bridging Service
Source-Routing Bridging
Token
Ring
Client
PC
Figure 26. Transparent WAN Backbone Topology
Figure 26 illustrates a common WAN topology that can use TRNSB. In this
case, the primary bridging technology is transparent bridging. Thus, the
WAN circuit group is not configured for source-routing bridging. Most traffic
crossing the WAN is TB traffic going to and from the Ethernets. The user
also has a need to print to the HP LaserJet printer on the Ethernet at site 2
from the client PC at site 1. The HP Router TR at site 1 will convert the
NetBEUI/SRB/802.5 frames to NetBEUI/TB/802.3 frames.
Client PC
HP Router
TR
Ethernet
Figure 27. Token Ring Backbone Topology
Figure 27 shows an example of a 16 Mbit/s token ring SRB backbone, used to
interconnect two distributed Ethernets. This topology is often found in envi-
ronments where many departments have installed their own LANs, while the
site services organization (often in coordination with the information tech-
nology organization) has specified token ring as the backbone technology.
2-38
Site 1
Transparent
HP Router
TR
Token
IBM
Ring
SRB
Site 2
HP Router
ER
Ethernet
Token
HP Router
Ring
TR
Ethernet
Server
PC
Server