Ti-Inactivity Timer

SNA Status and Conﬁguration

IDBLK

This parameter is used in conjunction with the IDNUM parameter (see below) in generating the Node Þeld in an XID (Exchange IdentiÞcation) frame (format 0 or

3)to establish a link station connection to the host. If both IDBLK and IDNUM are set to 0, the Node Þeld of the XID frame will be provided by the attached SDLC device. The node will send an XID command to the remote node to indicate that the SDLC device should be polled for an XID.

IDNUM

This parameter is used in conjunction with the IDBLK parameter (see above) in generating the Node Þeld in an XID frame (format 0 or 3) to establish a link station connection to the host. If both IDBLK and IDNUM are set to 0, the Node Þeld of the XID frame will be provided by the attached SDLC device. The node will send an XID command to the remote node to indicate that the SDLC device should be polled for an XID.

This timer is used by the link station to detect an inoperative condition in either the remote link station or the transmission medium. The timer will be started if the T1-LLC2 Reply Timer has been reset (see below), if additional LLC protocol data units (LPDUs) have been sent by the remote link station, and if there are no outstanding acknowledgments or responses from the local link station.

If the local station does not receive an LPDU before the Ti-Inactivity Timer expires, the station must send an LPDU with the P bit set to BÕ1Õ to solicit the remote stationÕs status. Recovery then proceeds as described under T1-LLC2 Reply Timer.

The value is the amount of time in seconds; the default value is 30.

T1-LLC2 Reply Timer

The Reply Timer is used to detect the failure to receive a required acknowledgment or response from the remote link station. The link station will start the timer when it transmits either an Information LPDU or a Command LPDU with the P bit set to BÕ1Õ. (If the LPDU is sent while the timer is already running, the link station will reset the timer.)

The link station will reset the T1-LLC2 Reply Timer when it receives one of these:

¥An REJ (Reject) LPDU, provided a Command LPDU with P bit set to BÕ1Õ is not outstanding;

¥A Response LPDU with the F bit set to BÕ1Õ;

¥An Information or Supervisory LPDU with an NR greater than the last NR received and less than or equal to the line stationÕs VS, provided a Command LPDU with P bit set to BÕ1Õ is not outstanding.

If additional LPDUs are set from the remote link station after the local station has reset theT1 timer, the timer will be restarted if acknowledgments of, or responses to, those LPDUs are outstanding. If no acknowledgments/responses are outstanding, the link station will start the Ti Inactivity Timer (see above).

7-12	Conﬁguring SNA Ports

1800, FRX4000, FRX6000 specifications

Cabletron Systems, a leading player in network management and telecommunications solutions during the late 20th century, introduced several innovative products that played a crucial role in shaping enterprise networking. Among these were the Cabletron FRX6000, FRX4000, and the FRX1800, which delivered advanced features aimed at enhancing network performance, security, and scalability.

The Cabletron FRX6000 was designed as a robust multi-layer switch, ideal for large-scale enterprise environments. It supported extensive routing capabilities, allowing organizations to manage traffic efficiently even under heavy loads. The FRX6000 boasted high throughput rates and low latency, making it suitable for demanding applications. With support for various network protocols, including IP, IPX, and AppleTalk, its adaptability made it a versatile choice for diverse networking needs. Moreover, security features like VLAN support and Access Control Lists (ACLs) provided enhanced protection against potential threats.

Moving to the FRX4000, this model offered a balance between performance and cost-effectiveness. The FRX4000 maintained many of the essential features of its larger counterpart while catering to medium-sized enterprises. It provided Layer 3 routing and could handle multiple simultaneous connections, ensuring seamless communication across departments. The modular design allowed for easy upgrades, enabling businesses to expand their network infrastructure without significant overhauls. This made the FRX4000 an attractive option for organizations looking to optimize their network investments.

Lastly, the FRX1800, designed for small to medium businesses, focused on simplicity and ease of use while still incorporating powerful network management capabilities. Its user-friendly interface made it accessible for organizations lacking extensive IT resources. The FRX1800 provided essential functionalities such as Integrated Layer 2 switching and routing, network monitoring, and basic security features, ensuring that even smaller companies could maintain efficient, reliable networking without overwhelming complexity.

All three models utilized advanced technologies, including a high bandwidth backbone and state-of-the-art switching architecture, to enable fast and reliable data transfer. They also supported Quality of Service (QoS) mechanisms, allowing businesses to prioritize critical applications and ensure consistent performance across the network.

In summary, the Cabletron FRX6000, FRX4000, and FRX1800 were pivotal in enhancing network capabilities, providing organizations with scalable, secure, and high-performance options tailored to their specific needs.

Cabletron Systems FRX6000, FRX4000, 1800 manual Ti-Inactivity Timer, T1-LLC2 Reply Timer

Models: 1800 FRX4000 FRX6000

SNA Status and Conﬁguration

IDBLK

IDNUM