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This chapter is from the book

This chapter is from the book

CCNP SWITCH Portable Command GuideCCNP SWITCH Portable Command Guide

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This chapter is from the book

This chapter is from the book

CCNP SWITCH Portable Command GuideCCNP SWITCH Portable Command Guide

Learn More Buy

Inter-VLAN Communication on a Multilayer Switch Through a Switch Virtual Interface

Rather than using an external router to provide inter-VLAN communication, a multilayer switch can perform the same task through the use of a switched virtual interface (SVI).

Removing L2 Switchport Capability of a Switch Port

3750Switch(config)#interface fastethernet 0/1

Moves to interface configuration mode.

3750Switch(config-if)#no switchport

Creates a Layer 3 port on the switch.

NOTE: The no switchport command can be used on physical ports only on a Layer 3–capable switch.

Configuring SVI Autostate

3750Switch(config)#interface fastethernet 0/1

Moves to interface configuration mode.

3750Switch(config-if)#switchport auto-state exclude

Excludes the access port/trunk in defining the status of an SVI as up or down.

NOTE: This command is commonly used for ports that are used for monitoring, for example, so that a monitoring port does not cause the SVI to remain "up" when no other ports are active in the VLAN.

NOTE

For the SVI line state to be up, at least one port in the VLAN must be up and forwarding. The switchport auto-state exclude command excludes a port from the SVI interface line-state up-or-down calculation.

Configuring a Layer 3 EtherChannel

Switch(config)#interface port-channel 1

Creates a virtual Layer 2 interface.

Switch(config-if)#no switchport

Changes interface to Layer 3 to enable the use of the IP address command.

Switch(config-if)#ip address 172.32.52.10 255.255.255.0

Assigns an IP address to the Layer 3 port-channel interface.

Switch(config)#interface range fastethernet 5/4 - 5

Moves to interface range configuration mode.

Switch(config-if-range)#no switchport

Creates Layer 3 ports on a switch.

Switch(config-if-range)#channel-protocol pagp

Configures port aggregation protocol.

Switch(config-if-range)#channel-group 1 mode desirable

Assigns the physical interfaces in the range to the EtherChannel group.

Configuring Inter-VLAN Communication

3550Switch(config)#interface vlan 1

Creates a virtual interface for VLAN 1 and enters interface configuration mode.

3550Switch(config-if)#ip address 172.16.1.1 255.255.255.0

Assigns IP address and netmask.

3550Switch(config-if)#no shutdown

Enables the interface.

3550Switch(config)#interface vlan 10

Creates a virtual interface for VLAN 10 and enters interface configuration mode.

3550Switch(config-if)#ip address 172.16.10.1 255.255.255.0

Assigns IP address and netmask.

3550Switch(config-if)#no shutdown

Enables the interface.

3550Switch(config)#interface vlan 20

Creates a virtual interface for VLAN 20 and enters interface configuration mode.

3550Switch(config-if)#ip address 172.16.20.1 255.255.255.0

Assigns IP address and netmask.

3550Switch(config-if)#no shutdown

Enables the interface.

3550Switch(config-if)#exit

Returns to global configuration mode.

3550Switch(config)#ip routing

Enables routing on the switch.

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