





LLC2
The SNA services LLC2 implementation includes the following key features:
- Type II LLC communication
- SNA LAN communication (including XID and TEST retries)
- Support for primary or secondary link station roles
- Modulo 128 sequence numbering
- Provision of IBM's Dynamic Window Algorithm for controlled restart of I-frame traffic after LAN congestion
- Access to the underlying LANs for router-type applications
- Ethernet and frame relay MAC types:
- Auto-sensing of 802.3 and DIX2 Ethernet frame formats
- Boundary Access Node (BAN)