Line > Distance Extension


Use the Distance Extension subtab to provision the distance extension parameters for the MXP_MR_2.5G and MXPP_MR_2.5G cards.

Item

Description

Port

The card port number.

Enable Distance Extension

If checked, allows additional distance by providing a generic framing procedure (GFP-T) based flow control scheme. It enables the node to be a part of a SAN with long-distance, remote nodes. If left unchecked, the remaining options are not available for editing. If Distance Extension is enabled, set the connected Fibre Channel switches to Interop or Open Fabric mode, depending on the Fibre Channel switch. By default, the MXP cards will interoperate with the Cisco MDS storage products.

Auto Detect Credits

If checked, enables the node to detect the transmit credits from a remote node. Credits are used for link flow control and for Extended Link Protocol (ELP) login frames between Fibre Channel/FICON Switch E ports.

Credits Available

Sets the number of credits if a ELP login frame setting is missing or if the ELP login frame cannot be detected. Possible values are 2 through 256 in multiples of 2. Credits Available is editable only if Auto Detect Credits is unchecked.

Note     Longer distances between connected devices need more credits to compensate for the latency introduced by the long-distance link. The value should never be greater than the number of credits supported by the Fibre Channel/FICON port.

Autoadjust GFP Buffer Threshold

If checked, guarantees the best utilization of the SONET/SDH transport in terms of bandwidth and latency.

GFP Buffers Available

Sets the GFP buffer depth. Possible values are 16 through 1200 in multiples of 16. GFP Buffers Available is editable if Autoadjust GFP Buffer Threshold is unchecked. For shorter SDH transport distances, Cisco recommends lower values to decrease latency. For longer SDH transport distances, Cisco recommends higher values to provide higher bandwidth.

Apply

Applies changes made to the fields in the tab.

Reset

Cancels any changes to the tab and returns the fields to their last-saved settings.

Help

Displays context-sensitive help.