Cisco WS-C2960-24TC-S-RF Software Guide - Page 62
Setting Ethernet and Fast Ethernet Port Debounce Timers, Delay Time, Port Type, With Debounce
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Configuring Ethernet and Fast Ethernet Ports Chapter 4 Configuring Ethernet and Fast Ethernet Switching Setting Ethernet and Fast Ethernet Port Debounce Timers You can set the port debounce timer on a per-port basis for Ethernet, Fast Ethernet, and Gigabit Ethernet ports. When you set the port debounce timer, the switch delays notifying the main processor of a link down; this delay in notification can decrease traffic loss due to network reconfiguration. Caution Enabling the port debounce timer will delay link-up and link-down detections, resulting in loss of data traffic during the debouncing period. This situation might delay the convergence and reconvergence of various Layer 2 and Layer 3 protocols. Table 4-2 lists the time delay that occurs before the switch notifies the main processor of a link down before and after the switch enables the debounce timer. Table 4-2 Switch Notification Delays for the Port Debounce Timer Port Type 10/100 ports 100BASE-FX ports 10/100/1000BASE-TX ports Gigabit TX ports Fiber Gigabit ports Delay Time With Debounce Timer Disabled 0 ms 0 ms 0 ms 0 ms 0 ms With Debounce Timer Enabled 3.1 sec 3.1 sec 3.1 sec 3.1 sec 3.1 sec Note The delay time is the time that the port is physically down, and once the port is up, the time the software needs to complete autonegotiation. To set the debounce timer on a port, perform this task in privileged mode: Task Step 1 Enable the debounce timer for a port. Step 2 Verify that the debounce timer of the port is configured correctly. Command set port debounce mod num/port num {enable | disable} show port debounce [mod | mod_num/port_num] This example shows how to enable the debounce timer for module 2 on port 1: Console> (enable) set port debounce 2/1 enable Debounce is enabled on port 2/1 Warning: Enabling port debounce causes Link Up/Down detections to be delayed. It results in loss of data traffic during debouncing period, which might affect the convergence/reconvergence of various Layer 2 and Layer 3 protocols. Use with caution. Console> (enable) Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 4-6 78-15486-01
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