Cisco Switch Threshold Groups Per VC Queueing Rm Threshold Group Table

1.3.6.1.4.1.9.10.10.1.9.1

The (conceptual) table containing information for Switch Threshold Groups. When cells are queued in the switch for a direction of cell traffic on an ATM connection (VC or VP), several functions related to queueing are dictated by the congestion state (fullness) of the Threshold Group. Each connection queue is a member of a Threshold Group. These functions include: - The limit on the number of cells that can be queued. Cells exceeding this limit are discarded. - The discard threshold, used for CLP/EPD discard when the fullness of the queue exceeds the threshold. - The marking threshold, used for EFCI marking. Each Threshold Group has a maximum number of cells that can be resident in it at any one time. The number of cells in a Group consists of the number of cells in all the queues that are a member of the Group. As the number of cells in a Group approaches the maximum number for the Group, the queue limits may be decreased. This limits the share of buffering available to each connection as cell-memory is used. On the Catalyst8540MSR platform, there are a maximum of 8 switching modules. Each switching module services a certain group of ports (this mapping is fixed in hardware). Each module also has its own cell memory (for per VC queueing), and hence performs its own congestion control, independent of any other switching module. Each switching module has its own set of Switch Threshold Groups, which are independently programmable and readable. This table is supported only on the Catalyst8540MSR platform.