Cisco Catalyst 4500 Series Software Configuration Guide

35-10
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 35 Configuring Layer 3 Interfaces
Configuring VLANs as Layer 3 Interfaces
Note To set the nonprotocol-specific MTU value for an interface, use the mtu interface configuration
command. Changing the MTU value (with the mtu interface configuration command) can affect the IP
MTU value. If the current IP MTU value matches the MTU value, and you change the MTU value, the
IP MTU value is modified automatically to match the new MTU. However, the reverse is not true;
changing the IP MTU value has no effect on the value for the mtu command.
For information on how to configure MTU size, refer to “Configuring MTU Sizes” on page 37.
To set the protocol-specific maximum transmission unit (MTU) size of IPv4 or IPv6 packets sent on an
interface, perform this task:
This example shows how to configure IPv4 MTU on an interface:
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# interface vlan 1
Switch(config-if)# ip mtu 68
Switch(config-if)# exit
Switch(config)# end
Switch# show ip interface vlan 1
Vlan1 is up, line protocol is up
Internet address is 10.10.10.1/24
Broadcast address is 255.255.255.255
Address determined by setup command
MTU is 68 bytes
Helper address is not set
.........................(continued)
The following example shows how to configure IPv6 MTU on an interface:
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# interface vlan 1
Switch(config-if)# ipv6 mtu 1280
Switch(config)# end
This example shows how to verify the configuration
Switch# show ipv6 interface vlan 1
Vlan1 is up, line protocol is up
IPv6 is enabled, link-local address is FE80::214:6AFF:FEBC:DEEA
Command Purpose
Step 1
Switch# configure terminal
Enters global configuration mode.
Step 2
Switch(config)# interface interface-id
Enters interface configuration mode.
Step 3
Switch(config-if)# [no] ip mtu mtu_size
or
Switch(config-if)# [no] ipv6 mtu mtu_size
Configures the IPv4 MTU size
Configures the IPv6 MTU size.
The no form of the command reverts to the default MTU
size (1500 bytes).
Step 4
Switch(config-if)# exit
Exits configuration interface mode.
Step 5
Switch(config)# end
Exits configuration mode.
Step 6
Switch# show run interface interface-id
Displays the running 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