Overview of IBM Networking
LLC2 and SDLC Parameters
modifying the control field parameters, you can determine the number of acknowledgments sent for frames received and the level of polling used to determine available stations. In this manner, you can set the amount of resources used for frame checking and optimize the network load.
SDLC is used as the primary SNA
The Cisco Implementation of LLC2
The Cisco LLC2 implementation supports the following features:
•Local acknowledgment for RSRB
This feature is used in our implementation of RSRB as described in the chapter “Configuring
Because LANs are now connected through RSRB and WAN backbones, the delays that occur are longer than LLC2 allows for bidirectional communication between hosts. Our local acknowledgment feature addresses the problem of delays, resending, and loss of user sessions.
•IBM LNM support
Routers using 4- or
LNM support is described in the chapter “Configuring
•SDLLC media translation
The SDLLC feature provides media translation between the serial lines running SDLC and Token Rings running LLC2. SDLLC consolidates the IBM SNA networks running SDLC into a
SDLLC is described in the chapter “Configuring IBM Network Media Translation.”
•ISO
The Cisco CMNS implementation runs X.25 packets over LLC2 so that X.25 can be extended to Ethernet, FDDI, and Token Ring media.
| Cisco IOS Bridging and IBM Networking Configuration Guide |
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