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parameter) must be used. The ISR traffic uses LLC Type 2 LAN frames. The
HPR traffic is handled in similar fashion to LLC Type 1 LAN frames and must
have a different SAP address.
The default SAP address for HPR traffic is X'C8'. If X'C8' has already been used
by another protocol on a port, the default must be overridden.
Note: There is only one APPN link station even though APPN ISR and HPR
traffic use different SAP addresses.
v For Frame Relay ports:
APPN ISR traffic and APPN HPR traffic transferred over a frame relay data link
connection supports both the RFC 1490 bridged frame format and the RFC 1490
routed frame format.
– RFC 1490 routed frame format
APPN ISR traffic will be transferred over a frame relay data link connection
using the connection-oriented multiprotocol encapsulation method defined in
RFC 1490 using:
- NLPID = X'08' (Q.933 encoding)
- L2PID = X'4C80' (Layer 2 protocol identifier indicating 802.2 LLC)
- L3PID = X'7083' (Layer 3 protocol identifier indicating SNA-APPN/FID2)
APPN HPR traffic transferred over a frame-relay data link connection does not
use IEEE 802.2 LLC. It uses a different multiprotocol encapsulation as defined
in RFC 1490 using:
- NLPID = X'08' (Q.933 encoding)
- L2PID = X'5081' (Layer 2 protocol identifier for no Layer 2 protocol)
- L3PID = X'7085' (Layer 3 protocol identifier indicating SNA-APPN/HPR)
APPN HPR does not use a SAP for traffic transferred using the RFC 1490
routed frame format because there is no Layer 2 protocol.
– RFC 1490 Bridged format
APPN HPR uses a SAP for traffic transferred using the RFC 1490 bridged
frame format.
v For PPP ports:
– APPN ISR traffic uses 802.2 LLC over the PPP connection.
– Since there is no layer 2 protocol used in HPR’s RFC 1490 encapsulation, no
SAP is used for HPR traffic.
v For ATM ports:
– APPN ISR traffic is not supported over native ATM ports. However, two types
of APPN traffic as defined by RFC 1483 are supported:
- During link station bring up, XIDs are transported using the following frame
format:
v NLPID = X'09'
v Layer 2 protocol ID = X'4C80' (802.2 LLC header present)
v Layer 3 protocol ID = X'7083' SNA APPN (FID2) including XID3
- HPR traffic is transported using the following frame format:
v NLPID = X'09'
v Layer 2 protocol ID = X'4C80' (802.2 LLC header present)
APPN
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MRS V3.2 Protocol Config Ref Vol 2