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Implementing Inter-VLAN Routing

Contents

  1. Inter-VLAN Communication Using an External Router: Router-on-a-Stick
  2. Inter-VLAN Communication Tips
  3. Inter-VLAN Communication on a Multilayer Switch Through a Switch Virtual Interface
  4. Configuration Example: Inter-VLAN Communication
  5. 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.

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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

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

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

NOTE

This configuration uses traditional OSPFv3 for routing. For more information on OSPFv3, see Chapter 5, “OSPF.”

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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