Cisco Catalyst 4500 Series Software Configuration Guide

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Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS
Chapter 9 Configuring Interfaces
Configuring Optional Interface Features
For example, before setting the per-interface MTU for interface gi1/1, you enter the system mtu 1550 command to change the
MTU for gi1/1 to 1550 bytes. You enter the per-interface mtu command to change the MTU for gi1/1 to 9198 bytes. If you
change the baby giant MTU to 1540 bytes with the command system mtu 1540, the MTU for gi1/1 remains unchanged at 9198
bytes.
Configuring the Port Debounce Timer
Note You can only configure port debounce on 10-Gigabit Ethernet ports.
The port debounce timer suppresses notification of short link-down events. Link-down events that are shorter than the port
debounce timer are not notified to Layer 2 or Layer 3 protocols, decreasing traffic loss due to network reconfiguration. You
can configure the port debounce timer separately on each LAN port.
Caution Enabling the port debounce timer causes a delay in link down detections, resulting in loss of traffic
during the debouncing period. This situation might affect the convergence and reconvergence of some
Layer 2 and Layer 3 protocols.
To configure the debounce timer on a port, perform this task:
Note The default time is 10ms for E-series supervisor engines and line cards.
When configuring the debounce timer on a port, you can increase the port debounce timer value between 10 milliseconds and
5000 milliseconds on the 10-Gigabit Ethernet ports.
This example shows how to enable the port debounce timer on 10-Gigabit Ethernet port 2/1 and to accept the default value (10
ms):
Switch# config terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# interface tenGigabitEthernet 2/1
Switch(config-if)# link debounce
Warning: Enabling debounce feature causes link down detection to be delayed
Switch(config-if)# exit
This example shows how to enable the port debounce timer of 5000 ms on 10-Gigabit Ethernet port 2/2 and to verify the setting:
Switch# config terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# interface tenGigabitEthernet 2/2
Switch(config-if)# link debounce time 5000
Command Purpose
Step 1
Switch(config)# interface tengigabitethernet
slot/port
Selects the port to configure.
Step 2
Switch(config-if)# link debounce [time
debounce_time]
Configures the debounce timer.
By default, debounce is disabled.
Switch(config-if)# no link debounce
Reverts to the default setting.
Step 3
Switch# show interfaces debounce
Verifies the configuration.

Cisco Catalyst 4500 Series Specifications

General

Series	Catalyst 4500 Series
Category	Switch
Layer Support	Layer 2, Layer 3
Form Factor	Modular chassis
Stackable	No
Chassis Slots	3, 6, 7, 10
Power Supply Options	AC, DC
Redundancy	Power supply, Supervisor engine
Network Management	Cisco IOS Software CLI, SNMP, Cisco Prime Infrastructure
Features	Security, QoS
Port Density	Up to 384 ports per chassis
Security Features	802.1X, ACLs, DHCP Snooping, Dynamic ARP Inspection, IP Source Guard
Supervisor Engine	8-E