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CCNP SWITCH Portable Command Guide: Implementing Inter-VLAN Routing

  • Sample Chapter is provided courtesy of Cisco Press.
  • Date: Apr 6, 2010.

This chapter provides information and commands concerning the following topics:

Inter-VLAN communication

  • Inter-VLAN communication using an external router: router-on-a-stick
  • Inter-VLAN communication tips
  • Inter-VLAN communication on a multilayer switch through a switch virtual interface
    • - Removing L2 switchport capability of a switch port
    • - Configuring SVI Autostate
    • - Configuring a Layer 3 EtherChannel
    • - Configuring inter-VLAN communication
  • Configuration example: inter-VLAN communication

DHCP

  • Configuring DHCP server on a Router or Layer 3 Switch
  • Verifying and troubleshooting DHCP configuration
  • Configuring a DHCP helper address
  • DHCP client on a Cisco IOS Software Ethernet interface
  • Configuration example: DHCP

CEF

  • Configuring Cisco Express Forwarding (CEF)
  • Verifying CEF
  • Troubleshooting CEF

Inter-VLAN Communication Using an External Router: Router-on-a-Stick

Router(config)#interface fastethernet 0/0

Moves to interface configuration mode.

Router(config-if)#duplex full

Sets interface to full duplex.

Router(config-if)#no shutdown

Enables interface.

Router(config-if)#interface fastethernet 0/0.1

Creates subinterface 0/0.1 and moves to subinterface configuration mode.

Router(config-subif)#description Management VLAN 1

(Optional) Sets locally significant descriptor of the subinterface.

Router(config-subif)#encapsulation dot1q 1 native

Assigns VLAN 1 to this subinterface. VLAN 1 is the native VLAN. This subinterface uses the 802.1Q trunking protocol.

Router(config-subif)#ip address 192.168.1.1 255.255.255.0

Assigns IP address and netmask.

Router(config-subif)#interface fastethernet 0/0.10

Creates subinterface 0/0.10 and moves to subinterface configuration mode.

Router(config-subif)#description Accounting VLAN 10

(Optional) Sets locally significant descriptor of the subinterface.

Router(config-subif)#encapsulation dot1q 10

Assigns VLAN 10 to this subinterface. This subinterface uses the 802.1Q trunking protocol.

Router(config-subif)#ip address 192.168.10.1 255.255.255.0

Assigns IP address and netmask.

Router(config-subif)#exit

Returns to interface configuration mode.

Router(config-if)#exit

Returns to global configuration mode.

Router(config)#

NOTE

The subnets of the VLANs are directly connected to the router. Routing between these subnets does not require a dynamic routing protocol. In a more complex topology, these routes need to either be advertised with whatever dynamic routing protocol is used, or be redistributed into whatever dynamic routing protocol is used.

NOTE

Routes to the subnets associated with these VLANs appear in the routing table as directly connected networks.

2. Inter-VLAN Communication Tips | Next Section

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