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InterVLAN Routing

InterVLAN Routing. Overview. VLANs control broadcast domain size and keep local traffic local. Key components of InterVLAN Routing. Requirements for InterVLAN Routing VLAN capable switch Router: External or integrated within a switch Router to VLAN connection. External Routers.

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InterVLAN Routing

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  1. InterVLAN Routing

  2. Overview VLANs control broadcast domain size and keep local traffic local.

  3. Key components of InterVLAN Routing Requirements for InterVLAN Routing VLAN capable switch Router: External or integrated within a switch Router to VLAN connection

  4. External Routers • Router-on-a-Stick • Trunk Link Advantages: • Saves router and switch ports…saves money and reduces complexity. • Scales to larger number of VLANs than one-link-per-VLAN design. • Trunk Link Disadvantages: • Additional router overhead • Older IOS versions support limited sets of features on trunked interfaces and may only support ISL trunking encapsulation.

  5. Cisco Layer 3 Feature Cards Catalyst 6000 Family Multilayer Switch Feature Card (MSFC2) Router-on-a-stick most appropriate when other options not available. Route switch processors generally adequate unless a high proportion of traffic crosses VLAN boundaries or a large number of gigabit or greater interfaces are present. Switch Fabric Module adds switching capacity.

  6. Configuring InterVLANRouting (1) • First task to turn on switch routing functionality. • Switch(config)# ip routing • Switch virtual interface (most common). • Switch#interface vlan 40 • Switch(config-if)# ip address 10.0.40.1 255.255.255.0 • Routed port (turns an Ethernet switch into an Ethernet Router by turning off a switch port functionality). • Switch(config)# interface fa 0/1 • Switch(config-if)# no switchport • Switch(config-if)# ip address 10.0.1.1 255.255.255.0 • The switch port can now be used as a physical router port for connection to an external device such as a router.

  7. Configuring InterVLANRouting (2) • RSP(config)#ip routing • RSP(config)# interface fa 0/1 • RSP(config-if)# no switchport • RSP(config)-if# ip address 10.0.1.1 255.255.255.0 • Ext(config)# interface fa0/0 • Ext(config-if)# ip address 10.0.1.2 255.255.255.0 InterVLAN routing most likely achieved through a virtual interface. As an example, VLAN 10 and VLAN 20 configured on the multi-layer switch. RSP(config)# interface vlan 10 RSP(config-if)# ip address 10.0.10.1 255.255.255.0 RSP(config)# interface vlan 20 RSP(config-if)# ip address 10.0.20.1 255.255.255.0 Don’t forget to enable a routing protocol on both the RSP and External router.

  8. Configuring InterVLAN Routing (3)

  9. Verifying InterVLAN Routing Configurations • Switch# show ip route • Switch# show ip interface brief • Switch# show ip interface fastethernet module/port • Can show if the port is configured for routing • Switch# show ip interface fastethernet module/portswitchport • Either switchport information will be displayed or “Switchport: Disabled” will indicate the port is likely configured for routing.

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