Cisco WS-C4003 Software Guide - Page 70
Sending and Receiving Pause Frames, Using Flow-Control Keywords, Switch Type, Module, Ports
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Understanding How Gigabit Ethernet Works Chapter 5 Configuring Gigabit Ethernet Switching Sending and Receiving Pause Frames All Catalyst Gigabit Ethernet ports can receive and process pause frames from other devices. However, not all Catalyst Gigabit Ethernet ports can transmit pause frames to other devices. Table 5-1 identifies the Catalyst Gigabit Ethernet switches, modules, and ports that can transmit pause frames to other devices. Table 5-1 Send Capability by Switch Type, Module, and Ports Switch Type Catalyst 4000 Catalyst 4000 Catalyst 4000 Catalyst 4000 Catalyst 4000 Catalyst 2948G Catalyst 2980 Module Ports All modules except WS-X4418-GB, All ports except for the WS-X4412-2GB-T, and oversubscribed ports listed below WS-X4416-2GB-TX WS-X4418-GB Uplink ports (1-2) WS-X4418-GB Oversubscribed ports (3-18) WS-X4412-2GB-T Uplink ports (13-14) WS-X4412-2GB-T Oversubscribed ports (1-12) All ports All ports All modules All ports Send No No Yes No Yes No No Using Flow-Control Keywords Table 5-2 describes guidelines for using different configurations of the send and receive keywords with the set port flowcontrol command. Table 5-2 Send and Receive Keyword Configurations Configuration send on send off send desired receive on receive off receive desired Description Enables a local port to send pause frames to a remote port. Use send on when a remote port is set to receive on or receive desired. Prevents a local port from sending pause frames to a remote port. Use send off when a remote port is set to receive off or receive desired. Indicates preference to send pause frames, but autonegotiates flow control. You can use send desired when a remote port is set to receive on, receive off, or receive desired. Enables a local port to process pause frames that a remote port sends. Use receive on when a remote port is set to send on or send desired. Prevents a local port from processing pause frames. Use receive off when a remote port is set to send off or send desired. Indicates preference to process pause frames, but autonegotiates flow control. You can use receive desired when a remote port is set to send on, send off, or send desired. Software Configuration Guide-Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4 5-2 78-12647-02