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CCNP SWITCH Portable Command Guide: Implementing Inter-VLAN Routing

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Date: Apr 6, 2010.

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Chapter Description

This chapter covers inter-VLAN communication, DHCP, and CIF.

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CCNP SWITCH Portable Command Guide

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Configuration Example: Inter-VLAN Communication

Figure 4-1 shows 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 previous chapters.

Figure 4-1 Network Topology for Inter-VLAN Communication Configuration

ISP Router

`Router>``enable`	Moves to privileged 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 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 IP address and netmask.
`ISP(config-if)#``clock rate 56000`	Assigns a clock rate to the interface—DCE cable is plugged in to 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`	Advertises directly connected networks (classful address only).
`ISP(config-router)#``network 192.31.7.0`	Advertises directly connected networks (classful address only).
`ISP(config-router)#``no auto-summary`	Disables auto summarization.
`ISP(config-router)#``exit`	Returns to global configuration mode.
`ISP(config)#``exit`	Returns to privileged mode.
`ISP#``copy running-config startup-config`	Saves the configuration to NVRAM.

CORP Router

`Router>``enable`	Moves to privileged mode.
`Router>#``configure terminal`	Moves to global configuration mode.
`Router(config)#``hostname CORP`	Sets the host name.
`ISP(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 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 3560 Switch`	Sets the locally significant interface description.
`CORP(config-if)#``ip address 172.31.1.5 255.255.255.252`	Assigns the 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)#``duplex full`	Enables full-duplex operation to ensure trunking will take effect between here and L2Switch2.
`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 trunking protocol.
`CORP(config-subif)#``ip address 192.168.1.1 255.255.255.0`	Assigns the 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 trunking protocol.
`CORP(config-subif)#``ip address 192.168.10.1 255.255.255.0`	Assigns the 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 trunking protocol.
`CORP(config-subif)#``ip address 192.168.20.1 255.255.255.0`	Assigns the 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 trunking protocol.
`CORP(config-subif)#``ip add 192.168.30.1 255.255.255.0`	Assigns the IP address and netmask.
`CORP(config-subif)#``exit`	Returns to interface configuration mode.
`CORP(config-if)#``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`	Advertises the 192.168.1.0 network.
`CORP(config-router)#``network 192.168.10.0`	Advertises the 192.168.10.0 network.
`CORP(config-router)#``network 192.168.20.0`	Advertises the 192.168.20.0 network.
`CORP(config-router)#``network 192.168.30.0`	Advertises the 192.168.30.0 network.
`CORP(config-router)#``network 172.31.0.0`	Advertises the 172.31.0.0 network.
`CORP(config-router)#``network 192.31.7.0`	Advertises the 192.31.7.0 network.
`CORP(config-router)#``no auto-summary`	Turns off automatic summarization at classful boundary.
`CORP(config-router)#``exit`	Returns to global configuration mode.
`CORP(config)#``exit`	Returns to privileged mode.
`CORP#``copy running-config startup-config`	Saves the configuration in NVRAM.

L2Switch2 (Catalyst 2960)

`Switch>``enable`	Moves to privileged mode.
`Switch#``configure terminal`	Moves to global configuration mode.
`Switch(config)#``hostname L2Switch2`	Sets the host name.
`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`	Enables 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`	Enables 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`	Enables 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 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 virtual interface for VLAN 1 and enters interface configuration mode.
`L2Switch2(config-if)#``ip address 192.168.1.2 255.255.255.0`	Assigns the 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 the default gateway address.
`L2Switch2(config)#``exit`	Returns to privileged mode.
`L2Switch2#``copy running-config startup-config`	Saves the configuration in NVRAM.

L3Switch1 (Catalyst 3560)

`Switch>``enable`	Moves to privileged mode.
`Switch#``configure terminal`	Moves to global configuration mode.
`Switch(config)#``hostname L3Switch1`	Sets the host name.
`L3Switch1(config)#``vtp mode sever`	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 0/1`	Moves to interface configuration mode.
`L3Switch1(config-if)#``switchport trunk encapsulation dot1q`	Specifies 802.1Q encapsulation on the trunk link.
`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 the 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 the 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 the IP address and mask.
`L3Switch1(config-if)#``no shutdown`	Enables the interface.
`L3Switch1(config-if)#``exit`	Returns to global configuration mode.
`L3Switch1(config)#``interface fastethernet 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 the 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 config mode.
`L3Switch1(config-router)#``network 172.16.0.0`	Advertises the 172.16.0.0 classful network.
`L3Switch1(config-router)#``network 172.31.0.0`	Advertises the 172.31.0.0 classful network.
`L3Switch1(config-router)#``no auto-summary`	Turns off automatic summarization at classful boundary.
`L3Switch1(config-router)#``exit`	Applies changes and returns to global configuration mode.
`L3Switch1(config)#``exit`	Returns to privileged mode.
`L3Switch1#``copy running-config startup-config`	Saves configuration in NVRAM.

L2Switch1 (Catalyst 2960)

`Switch>``enable`	Moves to privileged mode.
`Switch#``configure terminal`	Moves to global configuration mode.
`Switch(config)#``hostname L2Switch1`	Sets the host name.
`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`	Enables 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`	Enables 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 the 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 mode.
`L2Switch1#``copy running-config startup-config`	Saves the configuration in NVRAM.

5. Configuring DHCP Server on a Router or Layer 3 Switch | Next Section Previous Section

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