IBM BC-203 - Manual (Page 36)

Overview of IBM Networking
Enterprise Extender (HPR/IP)
BC-238
Cisco IOS Bridging and IBM Networking Configuration Guide
Figure 107 BX Functionality
Enterprise Extender (HPR/IP)
SNASw also supports the EE function. EE offers SNA HPR support directly over IP networks. EE also
uses connectionless User Datagram Protocol (UDP) transport. SNA COS and transmission priority are
maintained by mapping the transmission priority to the IP precedence and by mapping transmission
priority to separate UDP port numbers, allowing the IP network to be configured based on these
elements. Cisco’s IP prioritization technologies, such as weighted fair queueing (WFQ), prioritize the
traffic through the IP network. EE support on the IBM Communications Server for S/390 allows users
to build highly reliable SNA routed networks that run natively over an IP infrastructure directly to the
Enterprise servers. These network designs reduce points of failure in the network and provide reliable
SNA networks.
Figure 108 illustrates the EX functionality.
Figure 108 EX Functionality
CS/390
EN
CS/390
NN
Downstream
devices
SNASw
PU 2.0
EN
Cisco CIP
LEN
26186
Emulated
EN
Emulated
NN
CS/390
HPR EN
CS/390
HPR
Downstream
devices
HPR SNA
switch
PU 2.0
EN
IP
IP over channel
LEN
26187 SNA/HPR
directly over
IP/UDP