Implementing Inter-VLAN Routing

Date: Jun 3, 2020 By and . Sample Chapter is provided courtesy of Cisco Press.

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.

This chapter provides information and commands concerning the following topics:

  • Inter-VLAN communication using an external router: router-on-a-stick

  • Inter-VLAN communication tips

  • Inter-VLAN communication on a multilayer switch through an SVI

    • Configuring inter-VLAN communication on an L3 switch

  • Removing L2 switchport capability of an interface on an L3 switch

  • Configuration example: inter-VLAN communication

  • Configuration example: IPv6 inter-VLAN communication

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)# no
shutdown

Enables the 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 the locally significant description of the subinterface

NOTE

Best practices dictate that VLAN 1 should not be used for management or native traffic. Also, consider using separate VLANs for management and native traffic

 
Router(config-subif)#
encapsulation
dot1q 1 native

Assigns VLAN 1 to this subinterface. VLAN 1 will be the native VLAN. This subinterface uses the 802.1q tagging protocol

 
Router(config-subif)#
ip address 192.168.1.1
255.255.255.0

Assigns the 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 the locally significant description of the subinterface

 
Router(config-subif)#
encapsulation dot1q 10

Assigns VLAN 10 to this subinterface. This subinterface uses the 802.1q tagging protocol

 
Router(config-subif)#
ip address 192.168.10.1
255.255.255.0

Assigns the IP address and netmask

 
Router(config-subif)#
end

Returns to interface configuration mode

NOTE

Because the VLAN networks are directly connected to the router, routing between these networks does not require a dynamic routing protocol. However, if the router is configured with a dynamic routing protocol, then these networks should be advertised or redistributed to other routers.

NOTE

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

NOTE

In production environments, VLAN 1 should not be used as the management VLAN because it poses a potential security risk; all ports are in VLAN 1 by default, and it is an easy mistake to add a nonmanagement user to the management VLAN.

NOTE

Instead of creating a subinterface for the native VLAN (VLAN 1 in the preceding example), it is possible to use the physical interface for native (untagged) traffic. In other words, the physical interface (FastEthernet0/0) would get IP address 192.168.1.1 255.255.255 and it would handle all VLAN 1 native untagged traffic. You would still create a subinterface for VLAN 10 as previously described.

Inter-VLAN Communication Tips

  • Although most older routers (routers running IOS 12.2 and earlier) support both ISL and dot1q, some switch models support only dot1q, such as the 2960, 2960-x, 3650, and 9200 series. Check with the version of IOS you are using to determine whether ISL or dot1q is supported.

    • ISL will probably not be an option, as it has been deprecated for quite some time.

    • If you need to use ISL as your trunking protocol, use the command encapsulation isl x, where x is the number of the VLAN to be assigned to that subinterface.

  • Recommended best practice is to use the same number as the VLAN number for the subinterface number. It is easier to troubleshoot VLAN 10 on subinterface fa0/0.10 than on fa0/0.2.

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

NOTE

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).

Configuring Inter-VLAN Communication on an L3 Switch

Switch9300(config)# interface
vlan 1

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

 
Switch9300(config-if)# ip address
172.16.1.1 255.255.255.0

Assigns an IP address and netmask

 
Switch9300(config-if)# no
shutdown

Enables the interface

 
Switch9300(config)# interface
vlan 10

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

 
Switch9300(config-if)# ip address
172.16.10.1 255.255.255.0

Assigns an IP address and netmask

 
Switch9300(config-if)# no
shutdown

Enables the interface

 
Switch9300(config)# interface
vlan 20

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

 
Switch9300(config-if)# ip address
172.16.20.1 255.255.255.0

Assigns an IP address and netmask

 
Switch9300(config-if)# no
shutdown

Enables the interface

 
Switch9300(config-if)# exit

Returns to global configuration mode

 
Switch9300(config)# ip routing

Enables routing on the switch

NOTE

For an SVI to go to up/up and be added to the routing table, the VLAN for the SVI must be created, an IP address must be assigned, and at least one interface must support it (trunk or access).

Removing L2 Switchport Capability of an Interface on an L3 Switch

Switch9300(config)# interface
gigabitethernet 0/1

Moves to interface configuration mode

 
Switch9300(config-if)#
no switchport

Creates a Layer 3 port on the switch

NOTE

You can use the no switchport command on physical ports only on a Layer 3-capable switch

Configuration Example: Inter-VLAN Communication

Figure 3-1 illustrates the network topology for the configuration that follows, which shows how to configure inter-VLAN communication using commands covered in this chapter. Some commands used in this configuration are from other chapters.

Figure 3-1

Figure 3-1 Network Topology for Inter-VLAN Communication Configuration

ISP Router

Router> enable

Moves to privileged EXEC mode

 
Router># configure terminal

Moves to global configuration mode

 
Router(config)# hostname ISP

Sets the host name

 
ISP(config)# interface loopback 0

Moves to interface configuration mode

 
ISP(config-if)# description
simulated address representing
remote website

Sets the locally significant interface description

 
ISP(config-if)# ip address
198.133.219.1 255.255.255.0

Assigns an IP address and netmask

 
ISP(config-if)# interface serial
0/0/0

Moves to interface configuration mode

 
ISP(config-if)# description WAN
link to the Corporate Router

Sets the locally significant interface description

 
ISP(config-if)# ip address
192.31.7.5 255.255.255.252

Assigns an IP address and netmask

 
ISP(config-if)# clock
rate 4000000

Assigns a clock rate to the interface; DCE cable is plugged into this interface

 
ISP(config-if)# no shutdown

Enables the interface

 
ISP(config-if)# exit

Returns to global configuration mode

 
ISP(config-if)# router
eigrp 10

Creates Enhanced Interior Gateway Routing Protocol (EIGRP) routing process 10

 
ISP(config-router)# network
198.133.219.0 0.0.0.255

Advertises directly connected networks

 
ISP(config-router)# network
192.31.7.0 0.0.0.255

Advertises directly connected networks

 
ISP(config-router)# end

Returns to privileged EXEC mode

 
ISP# copy running-config
startup-config

Saves the configuration to NVRAM

CORP Router

Router> enable

Moves to privileged EXEC mode

 
Router># configure terminal

Moves to global configuration mode

 
Router(config)# hostname CORP

Sets the host name

 
CORP(config)# no ip
domain-lookup

Turns off Domain Name System (DNS) resolution to avoid wait time due to DNS lookup of spelling errors

 
CORP(config)# interface serial
0/0/0

Moves to interface configuration mode

 
CORP(config-if)# description
link to ISP

Sets the locally significant interface description

 
CORP(config-if)# ip address
192.31.7.6 255.255.255.252

Assigns an IP address and netmask

 
CORP(config-if)# no shutdown

Enables the interface

 
CORP(config)# interface
fastethernet 0/1

Moves to interface configuration mode

 
CORP(config-if)# description
link to L3Switch1

Sets the locally significant interface description

 
CORP(config-if)# ip address
172.31.1.5 255.255.255.252

Assigns an IP address and netmask

 
CORP(config-if)# no shutdown

Enables the interface

 
CORP(config-if)# exit

Returns to global configuration mode

 
CORP(config)# interface
fastethernet 0/0

Enters interface configuration mode

 
CORP(config-if)# no shutdown

Enables the interface

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

Creates a virtual subinterface and moves to subinterface configuration mode

 
CORP(config-subif)# description
Management VLAN 1 - Native VLAN

Sets the locally significant interface description

 
CORP(config-subif)# encapsulation
dot1q 1 native

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

 
CORP(config-subif)# ip address
192.168.1.1 255.255.255.0

Assigns an IP address and netmask

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

Creates a virtual subinterface and moves to subinterface configuration mode

 
CORP(config-subif)# description
Sales VLAN 10

Sets the locally significant interface description

 
CORP(config-subif)# encapsulation
dot1q 10

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

 
CORP(config-subif)# ip address
192.168.10.1 255.255.255.0

Assigns an IP address and netmask

 
CORP(config-subif)# interface
fastethernet 0/0.20

Creates a virtual subinterface and moves to subinterface configuration mode

 
CORP(config-subif)# description
Engineering VLAN 20

Sets the locally significant interface description

 
CORP(config-subif)# encapsulation
dot1q 20

Assigns VLAN 20 to this subinterface. This subinterface uses the 802.1q protocol

 
CORP(config-subif)# ip address
192.168.20.1 255.255.255.0

Assigns an IP address and netmask

 
CORP(config-subif)# interface
fastethernet 0/0.30

Creates a virtual subinterface and moves to subinterface configuration mode

 
CORP(config-subif)# description
Marketing VLAN 30

Sets the locally significant interface description

 
CORP(config-subif)# encapsulation
dot1q 30

Assigns VLAN 30 to this subinterface. This subinterface uses the 802.1q protocol

 
CORP(config-subif)# ip add
192.168.30.1 255.255.255.0

Assigns an IP address and netmask

 
CORP(config-subif)# exit

Returns to global configuration mode

 
CORP(config)# router eigrp 10

Creates EIGRP routing process 10 and moves to router configuration mode

 
CORP(config-router)# network
192.168.1.0 0.0.0.255

Advertises the 192.168.1.0 network

 
CORP(config-router)# network
192.168.10.0 0.0.0.255

Advertises the 192.168.10.0 network

 
CORP(config-router)# network
192.168.20.0 0.0.0.255

Advertises the 192.168.20.0 network

 
CORP(config-router)# network
192.168.30.0 0.0.0.255

Advertises the 192.168.30.0 network

 
CORP(config-router)# network
172.31.0.0 0.0.255.255

Advertises the 172.31.0.0 network

 
CORP(config-router)# network
192.31.7.0 0.0.0.3

Advertises the 192.31.7.0 network

 
CORP(config-router)# end

Returns to privileged EXEC mode

 
CORP# copy running-config
startup-config

Saves the configuration in NVRAM

L2Switch2 (Catalyst 2960)

Switch> enable

Moves to privileged EXEC mode

 
Switch# configure terminal

Moves to global configuration mode

 
Switch(config)# hostname L2Switch2

Sets the host name

 
L2Switch2(config)#
no ip domain-lookup

Turns off DNS resolution

 
L2Switch2(config)# vlan 10

Creates VLAN 10 and enters VLAN configuration mode

 
L2Switch2(config-vlan)# name Sales

Assigns a name to the VLAN

 
L2Switch2(config-vlan)# exit

Returns to global configuration mode

 
L2Switch2(config)# vlan 20

Creates VLAN 20 and enters VLAN configuration mode

 
L2Switch2(config-vlan)# name
Engineering

Assigns a name to the VLAN

 
L2Switch2(config-vlan)#
vlan 30

Creates VLAN 30 and enters VLAN configuration mode. Note that you do not have to exit back to global configuration mode to execute this command

 
L2Switch2(config-vlan)# name
Marketing

Assigns a name to the VLAN

 
L2Switch2(config-vlan)# exit

Returns to global configuration mode

 
L2Switch2(config)# interface
range fastethernet 0/2 - 4

Enters interface range configuration mode and allows you to set the same configuration parameters on multiple ports at the same time

 
L2Switch2(config-if-range)#
switchport mode access

Sets ports 2–4 as access ports

 
L2Switch2(config-if-range)#
switchport access vlan 10

Assigns ports 2–4 to VLAN 10

 
L2Switch2(config-if-range)#
interface range fastethernet
0/5 - 8

Enters interface range configuration mode and allows you to set the same configuration parameters on multiple ports at the same time

 
L2Switch2(config-if-range)#
switchport mode access

Sets ports 5–8 as access ports

 
L2Switch2(config-if-range)#
switchport access vlan 20

Assigns ports 5–8 to VLAN 20

 
L2Switch2(config-if-range)#
interface range fastethernet
0/9 - 12

Enters interface range configuration mode and allows you to set the same configuration parameters on multiple ports at the same time

 
L2Switch2(config-if-range)#
switchport mode access

Sets ports 9–12 as access ports

 
L2Switch2(config-if-range)#
switchport access vlan 30

Assigns ports 9–12 to VLAN 30

 
L2Switch2(config-if-range)# exit

Returns to global configuration mode

 
L2Switch2(config)# interface
fastethernet 0/1

Moves to interface configuration mode

 
L2Switch2(config)# description
Trunk Link to CORP Router

Sets the locally significant interface description

 
L2Switch2(config-if)#
switchport mode trunk

Puts the interface into trunking mode and negotiates to convert the link into a trunk link

 
L2Switch2(config-if)# exit

Returns to global configuration mode

 
L2Switch2(config)#
interface vlan 1

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

 
L2Switch2(config-if)# ip address
192.168.1.2 255.255.255.0

Assigns an IP address and netmask

 
L2Switch2(config-if)# no shutdown

Enables the interface

 
L2Switch2(config-if)# exit

Returns to global configuration mode

 
L2Switch2(config)# ip
default-gateway 192.168.1.1

Assigns a default gateway address

 
L2Switch2(config)# exit

Returns to privileged EXEC mode

 
L2Switch2# copy running-config
startup-config

Saves the configuration in NVRAM

L3Switch1 (Catalyst 3650)

Switch> enable

Moves to privileged EXEC mode

 
Switch# configure terminal

Moves to global configuration mode

 
Switch(config)# hostname L3Switch1

Sets the host name

 
L3Switch1(config)#
no ip domain-lookup

Turns off DNS queries so that spelling mistakes do not slow you down

 
L3Switch1(config)# vtp mode server

Changes the switch to VTP server mode

 
L3Switch1(config)# vtp domain
testdomain

Configures the VTP domain name to testdomain

 
L3Switch1(config)# vlan 10

Creates VLAN 10 and enters VLAN configuration mode

 
L3Switch1(config-vlan)# name
Accounting

Assigns a name to the VLAN

 
L3Switch1(config-vlan)# exit

Returns to global configuration mode

 
L3Switch1(config)# vlan 20

Creates VLAN 20 and enters VLAN configuration mode

 
L3Switch1(config-vlan)# name
Marketing

Assigns a name to the VLAN

 
L3Switch1(config-vlan)# exit

Returns to global configuration mode

 
L3Switch1(config)# interface
gigabitethernet 1/0/1

Moves to interface configuration mode

 
L3Switch1(config-if)# switchport
trunk encapsulation dot1q

Specifies 802.1Q tagging on the trunk link (only necessary on older model switches like the 3560 and 3750)

 
L3Switch1(config-if)# switchport
mode trunk

Puts the interface into trunking mode and negotiates to convert the link into a trunk link

 
L3Switch1(config-if)# exit

Returns to global configuration mode

 
L3Switch1(config)# ip routing

Enables IP routing on this device

 
L3Switch1(config)# interface vlan 1

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

 
L3Switch1(config-if)# ip address
172.16.1.1 255.255.255.0

Assigns an IP address and netmask

 
L3Switch1(config-if)# no shutdown

Enables the interface

 
L3Switch1(config-if)# interface
vlan 10

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

 
L3Switch1(config-if)# ip address
172.16.10.1 255.255.255.0

Assigns an IP address and mask

 
L3Switch1(config-if)# no shutdown

Enables the interface

 
L3Switch1(config-if)# interface
vlan 20

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

 
L3Switch1(config-if)# ip address
172.16.20.1 255.255.255.0

Assigns an IP address and mask

 
L3Switch1(config-if)# no shutdown

Enables the interface

 
L3Switch1(config-if)# exit

Returns to global configuration mode

 
L3Switch1(config)# interface
gigabitethernet 1/0/24

Enters interface configuration mode

 
L3Switch1(config-if)#
no switchport

Creates a Layer 3 port on the switch

 
L3Switch1(config-if)# ip address
172.31.1.6 255.255.255.252

Assigns an IP address and netmask

 
L3Switch1(config-if)# exit

Returns to global configuration mode

 
L3Switch1(config)# router
eigrp 10

Creates EIGRP routing process 10 and moves to router configuration mode

 
L3Switch1(config-router)# network
172.16.0.0 0.0.255.255

Advertises the 172.16.0.0 network

 
L3Switch1(config-router)# network
172.31.0.0 0.0.255.255

Advertises the 172.31.0.0 network

 
L3Switch1(config-router)# end

Applies changes and returns to privileged EXEC mode

 
L3Switch1# copy running-config
startup-config

Saves configuration in NVRAM

L2Switch1 (Catalyst 2960)

Switch> enable

Moves to privileged EXEC mode

 
Switch# configure terminal

Moves to global configuration mode

 
Switch(config)# hostname L2Switch1

Sets the host name

 
L2Switch1(config)# no ip
domain-lookup

Turns off DNS queries so that spelling mistakes do not slow you down

 
L2Switch1(config)# vtp domain
testdomain

Configures the VTP domain name to testdomain

 
L2Switch1(config)# vtp mode client

Changes the switch to VTP client mode

 
L2Switch1(config)# interface
range fastethernet 0/1 - 4

Enters interface range configuration mode and allows you to set the same configuration parameters on multiple ports at the same time

 
L2Switch1(config-if-range)#
switchport mode access

Sets ports 1–4 as access ports

 
L2Switch1(config-if-range)#
switchport access vlan 10

Assigns ports 1–4 to VLAN 10

 
L2Switch1(config-if-range)#
interface range fastethernet
0/5 - 8

Enters interface range configuration mode and allows you to set the same configuration parameters on multiple ports at the same time

 
L2Switch1(config-if-range)#
switchport mode access

Sets ports 5–8 as access ports

 
L2Switch1(config-if-range)#
switchport access vlan 20

Assigns ports 5–8 to VLAN 20

 
L2Switch1(config-if-range)# exit

Returns to global configuration mode

 
L2Switch1(config)# interface
gigabitethernet 0/1

Moves to interface configuration mode

 
L2Switch1(config-if)# switchport
mode trunk

Puts the interface into trunking mode and negotiates to convert the link into a trunk link

 
L2Switch1(config-if)# exit

Returns to global configuration mode

 
L2Switch1(config)# interface
vlan 1

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

 
L2Switch1(config-if)# ip address
172.16.1.2 255.255.255.0

Assigns an IP address and netmask

 
L2Switch1(config-if)# no shutdown

Enables the interface

 
L2Switch1(config-if)# exit

Returns to global configuration mode

 
L2Switch1(config)# ip
default-gateway 172.16.1.1

Assigns the default gateway address

 
L2Switch1(config)# exit

Returns to privileged EXEC mode

 
L2Switch1# copy running-config
startup-config

Saves the configuration in NVRAM

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