Home > Articles > Implementing Inter-VLAN Routing

Implementing Inter-VLAN Routing

By Scott Empson, Patrick Gargano.
Sample Chapter is provided courtesy of Cisco Press.
Date: Jun 3, 2020.

Chapter Information

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
Configuration Example: Inter-VLAN Communication
Configuration Example: IPv6 Inter-VLAN Communication

Chapter Description

The CCNP and CCIE Enterprise Core & CCNP Enterprise Advanced Routing Portable Command Guide is a fully updated quick reference resource to help you memorize commands and concepts for CCNP or CCIE certifications. In this sample chapter, you will review information and commands related to implementing inter-VLAN routing.

From the Book

CCNP and CCIE Enterprise Core & CCNP Enterprise Advanced Routing Portable Command Guide: All ENCOR (350-401) and ENARSI (300-410) Commands in One Compact, Portable Resource

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Configuration Example: IPv6 Inter-VLAN Communication

Figure 3-2 shows the network topology for the configuration that follows, which demonstrates how to configure IPv6 inter-VLAN communication using commands covered in this chapter. Some commands used in this configuration are from previous chapters.

Figure 3-2 Network Topology for IPv6 Inter-VLAN Communication Configuration

ISP Router

`Router(config)# hostname ISP`	Sets the hostname
`ISP(config)# ipv6 unicast-routing`	Enables IPv6 routing
`ISP(config)# interface loopback 0`	Enters interface configuration mode
`ISP(config-if)# ipv6 address 2001:db8:0:a::1/64`	Assigns an IPv6 address
`ISP(config-if)# interface serial 0/0/0`	Enters interface configuration mode
`ISP(config-if)# clock rate 4000000`	Assigns a clock rate to the interface; DCE cable is plugged into this interface
`ISP(config-if)# ipv6 address 2001:db8:0:8::1/64`	Assigns an IPv6 address
`ISP(config-if)# no shutdown`	Turns on this interface
`ISP(config-if)# exit`	Exits into global configuration mode
`ISP(config)# ipv6 route ::/0 serial 0/0/0`	Creates a default static route to return traffic from the Internet NOTE A dynamic routing protocol can also be used here
`ISP(config)# end`	Returns to privileged EXEC mode

CORP Router

`Router(config)# hostname CORP`	Sets the hostname
`CORP(config)# ipv6 unicast-routing`	Enables global IPv6 forwarding
`CORP(config)# ipv6 router ospf 1`	Enters OSPFv3 programming mode
`CORP(config-rtr)# router-id 192.168.1.1`	Assigns a router ID for the OSPFv3 process
`CORP(config-rtr)# default- information originate`	Adds any default routing information to the OSPFv3 updates
`CORP(config-rtr)# exit`	Exits to global configuration mode
`CORP(config)# interface gigabitethernet 0/0.1`	Enters subinterface programming mode
`CORP(config-subif)# encapsulation dot1q 1 native`	Assigns 802.1Q as the trunking protocol and associates VLAN 1 to this subinterface
`CORP(config-subif)# ipv6 address 2001:db8:0:2::1/64`	Assigns an IPv6 address
`CORP(config-subif)# ipv6 ospf 1 area 0`	Specifies this as an interface that will participate in OSPFv3
`CORP(config-subif)# interface gigabitethernet 0/0.30`	Enters subinterface programming mode
`CORP(config-subif)# encapsulation dot1q 30`	Assigns 802.1Q as the trunking protocol and associates VLAN 30 to this subinterface
`CORP(config-subif)# ipv6 address 2001:db8:0:30::1/64`	Assigns an IPv6 address
`CORP(config-subif)# ipv6 ospf 1 area 0`	Specifies this as an interface that will participate in OSPFv3
`CORP(config-subif)# interface gigabitethernet 0/0.40`	Enters subinterface programming mode
`CORP(config-subif)# encapsulation dot1q 40`	Assigns 802.1Q as the trunking protocol and associates VLAN 40 to this subinterface
`CORP(config-subif)# ipv6 address 2001:db8:0:40::1/64`	Assigns an IPv6 address
`CORP(config-subif)# ipv6 ospf 1 area 0`	Specifies this as an interface that will participate in OSPFv3
`CORP(config-subif)# interface gigabitethernet 0/0.50`	Enters subinterface programming mode
`CORP(config-subif)# encapsulation dot1q 50`	Assigns 802.1Q as the trunking protocol and associates VLAN 50 to this subinterface
`CORP(config-subif)# ipv6 address 2001:db8:0:50::1/64`	Assigns an IPv6 address
`CORP(config-subif)# ipv6 ospf 1 area 0`	Specifies this as an interface that will participate in OSPFv3
`CORP(config-subif)# interface gigabitethernet 0/1`	Enters interface programming mode
`CORP(config-if)# ipv6 address 2001:db8:0:7::2/64`	Assigns an IPv6 address
`CORP(config-if)# ipv6 ospf 1 area 0`	Specifies this as an interface that will participate in OSPFv3
`CORP(config-if)# interface gigabitethernet 0/0`	Enters interface programming mode
`CORP(config-if)# no shutdown`	Turns this interface on
`CORP(config-if)# interface serial 0/0/0`	Enters interface programming mode
`CORP(config-if)# ipv6 address 2001:db8:0:8::2/64`	Assigns an IPv6 address
`CORP(config-if)# no shutdown`	Turns this interface on
`CORP(config-if)# exit`	Exits to global configuration programming mode
`CORP(config)# ipv6 route ::/0 serial 0/0/0`	Creates a default static route pointing to the ISP
`CORP(config)# end`	Returns to privileged EXEC mode

L2Switch2 (Catalyst 2960)

`Switch(config)# hostname L2Switch2`	Sets the hostname
`L2Switch2(config)# sdm prefer dual-ipv4-and-ipv6 default`	Configures the Switching Database Manager (SDM) on the switch to optimize memory and operating system for both IPv4 and IPv6 Layer 3 forwarding NOTE If this is a change in the SDM settings, the switch must be reloaded for this change to take effect
`L2Switch2(config)# vlan 30,40,50`	Creates VLANs 30, 40, and 50
`L2Switch2(config-vlan)# exit`	Exits VLAN configuration mode
`L2Switch2(config)# interface fastethernet 0/5`	Enters switchport interface configuration mode
`L2Switch2(config-if)# switchport mode trunk`	Sets this port to trunk unconditionally
`L2Sw2(config-if)# interface range fastethernet 0/12 - 14`	Enters switchport configuration mode for a range of switch ports
`L2Switch2(config-if-range)# switchport mode access`	Sets these ports to be access ports
`L2Switch2(config-if-range)# switchport access vlan 30`	Assigns these ports to VLAN 30
`L2Switch2(config-if-range)# interface range fastethernet 0/15 - 18`	Enters switchport configuration mode for a range of switch ports
`L2Switch2(config-if-range)# switchport mode access`	Sets these ports to be access ports
`L2Switch2(config-if-range)# switchport access vlan 40`	Assigns these ports to VLAN 20
`L2Switch2(config-if-range)# interface range fastethernet 0/19 - 22`	Enters switchport configuration mode for a range of switchports
`L2Switch2(config-if-range)# switchport mode access`	Sets these ports to be access ports
`L2Switch2(config-if-range)# switchport access vlan 50`	Assigns these ports to VLAN 50
`L2Switch2(config-if-range)# interface vlan1`	Enters interface configuration mode for the management VLAN
`L2Switch2(config-if)# ipv6 address 2001:db8:0:2::/64`	Assigns an IPv6 address
`L2Switch2(config-if)# no shutdown`	Turns this interface on
`L2Switch2(config-if)# exit`	Exits to global configuration mode
`L2Switch2(config)# ipv6 route ::/0 2001:db8:0:2::1`	Assigns a default gateway
`L2Switch2(config)# end`	Returns to privileged EXEC mode

L3Switch1 (Catalyst 3650)

`Switch(config)# hostname L3Switch1`	Sets the hostname
`L3Switch1(config)# ipv6 unicast-routing`	Enables IPv6 forwarding
`L3Switch1(config)# vlan 10,20`	Creates VLANs 10 and 20
`L3Switch1(config-vlan)# exit`	Exits VLAN configuration mode
`L3Switch1(config)# interface gigabitethernet 1/0/1`	Enters interface configuration mode
`L3Switch1(config-if)# switchport mode trunk`	Sets this port to trunk unconditionally
`L3Switch1(config-if)# ipv6 router ospf 1`	Enters OSPFv3 configuration mode
`L3Switch1(config-rtr)# router-id 192.168.1.2`	Assigns the OSPFv3 router ID
`L3Switch1(config-rtr)# exit`	Exits to global configuration mode
`L3Switch1(config)# interface gigabitethernet 1/0/24`	Enters switchport interface configuration mode
`L3Switch1(config-if)# no switchport`	Changes this Layer 2 switch port to a Layer 3 routed port
`L3Switch1(config-if)# ipv6 address 2001:db8:0:7::1/64`	Assigns an IPv6 address
`L3Switch1(config-if)# ipv6 ospf 1 area 0`	Specifies this as an interface that will participate in OSPFv3
`L3Switch1(config-if)# interface vlan1`	Enters interface configuration mode for VLAN 1
`L3Switch1(config-if)# ipv6 address 2001:db8:0:1::1/64`	Assigns an IPv6 address
`L3Switch1(config-if)# ipv6 ospf 1 area 0`	Specifies this as an interface that will participate in OSPFv3
`L3Switch1(config-if)# interface vlan10`	Enters interface configuration mode for VLAN 10
`L3Switch1(config-if)# ipv6 address 2001:db8:0:10::1/64`	Assigns an IPv6 address
`L3Switch1(config-if)# ipv6 ospf 1 area 0`	Specifies this as an interface that will participate in OSPFv3
`L3Switch1(config-if)# interface vlan20`	Enters interface configuration mode for VLAN 20
`L3Switch1(config-if)# ipv6 address 2001:db8:0:20::1/64`	Assigns an IPv6 address
`L3Switch1(config-if)# ipv6 ospf 1 area 0`	Specifies this as an interface that will participate in OSPFv3
`L3Switch1(config-if)# end`	Returns to privileged EXEC mode

L2Switch1 (Catalyst 2960)

`Switch(config)# hostname L2Switch1`	Sets the hostname
`L2Switch1(config)# sdm prefer dual-ipv4-and-ipv6 default`	Configures the Switching Database Manager on the switch to optimize memory and operating system for both IPv4 and IPv6 Layer 3 forwarding
`L2Switch1(config)# vlan 10,20`	Creates VLANs 10 and 20
`L2Switch1(config-vlan)# exit`	Exits VLAN configuration mode
`L2Switch1(config)# interface gigabitethernet 0/1`	Enters switchport interface configuration mode
`L2Switch1(config-if)# switchport mode trunk`	Sets this port to trunk unconditionally
`L2Switch1(config-if)# interface range fastethernet 0/12 - 14`	Enters switchport configuration mode for a range of switch ports
`L2Switch1(config-if-range)# switchport mode access`	Sets these ports to be access ports
`L2Switch1(config-if-range)# switchport access vlan 10`	Assigns these ports to VLAN 10
`L2Switch1(config-if-range)# interface range fastethernet 0/15 - 18`	Enters switchport configuration mode for a range of switch ports
`L2Switch1(config-if-range)# switchport mode access`	Sets these ports to be access ports
`L2Switch1(config-if-range)# switchport access vlan 20`	Assigns these ports to VLAN 20
`L2Switch1(config-if-range)# interface vlan1`	Moves to interface configuration mode
`L2Switch1(config-if)# ipv6 address 2001:0:0:4::2/64`	Assigns an IPv6 address
`L2Switch1(config-if)# exit`	Returns to global configuration mode
`L2Switch1(config)# ipv6 route ::/0 2001:db8:0:1::1`	Assigns a default gateway
`L2Switch1(config)# end`	Returns to privileged EXEC mode

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