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CCNP SWITCH Portable Command Guide: Implementing Inter-VLAN Routing

Sample Chapter is provided courtesy of Cisco Press.
Date: Apr 6, 2010.

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Chapter Information

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: DHCP

Figure 4-2 illustrates the network topology for the configuration that follows, which shows how to configure DHCP services on a Cisco IOS router using the commands covered in this chapter.

Figure 4-2 Network Topology for DHCP Configuration

Edmonton Router

`router>``enable`	Moves to privileged mode.
`router#``configure terminal`	Moves to global configuration mode.
`router(config)#``host Edmonton`	Sets the host name.
`Edmonton(config)#``interface fastethernet 0/0`	Moves to interface configuration mode.
`Edmonton(config-if)#``description LAN Interface`	Sets the local description of the interface.
`Edmonton(config-if)#``ip address 10.0.0.1 255.0.0.0`	Assigns an IP address and netmask.
`Edmonton(config-if)#``no shutdown`	Enables the interface.
`Edmonton(config-if)#``interface serial 0/0/0`	Moves to interface configuration mode.
`Edmonton(config-if)#``description Link to Gibbons Router`	Sets the local description of the interface.
`Edmonton(config-if)#``ip address 192.168.1.2 255.255.255.252`	Assigns an IP address and netmask.
`Edmonton(config-if)#``clock rate 56000`	Assigns the clock rate to the DCE cable on this side of link.
`Edmonton(config-if)#``no shutdown`	Enables the interface.
`Edmonton(config-if)#``exit`	Returns to global configuration mode.
`Edmonton(config)#``router eigrp 10`	Enables the EIGRP routing process for autonomous system 10.
`Edmonton(config-router)#``network 10.0.0.0`	Advertises the 10.0.0.0 network.
`Edmonton(config-router)#``network 192.168.1.0`	Advertises the 192.168.1.0 network.
`Edmonton(config-router)#``exit`	Returns to global configuration mode.
`Edmonton(config)#``service dhcp`	Verifies that the router can use DHCP services and that DHCP is enabled.
`Edmonton(config)#``ip dhcp excluded-address 10.0.0.1 10.0.0.5`	Specifies the range of addresses not to be leased out to clients.
`Edmonton(config)#``ip dhcp pool 10 network`	Creates a DHCP pool called 10network.
`Edmonton(dhcp-config)#``network 10.0.0.0 255.0.0.0`	Defines the range of addresses to be leased.
`Edmonton(dhcp-config)#``default-router 10.0.0.1`	Defines the address of the default router for clients.
`Edmonton(dhcp-config)#``netbios-name-server 10.0.0.2`	Defines the address of the NetBIOS server for clients.
`Edmonton(dhcp-config)#``dns-server 10.0.0.3`	Defines the address of the DNS server for clients.
`Edmonton(dhcp-config)#``domain-name fakedomainname.ca`	Defines the domain name for clients.
`Edmonton(dhcp-config)#``lease 12 14 30`	Sets the lease time to be 12 days, 14 hours, 30 minutes.
`Edmonton(dhcp-config)#``exit`	Returns to global configuration mode.
`Edmonton(config)#``ip dhcp pool 192.168.3network`	Creates a DHCP pool called the 192.168.3network.
`Edmonton(dhcp-config)#``network 192.168.3.0 255.255.255.0`	Defines the range of addresses to be leased.
`Edmonton(dhcp-config)#``default-router 192.168.3.1`	Defines the address of the default router for clients.
`Edmonton(dhcp-config)#``netbios-name-server 10.0.0.2`	Defines the address of the NetBIOS server for clients.
`Edmonton(dhcp-config)#``dns-server 10.0.0.3`	Defines the address of the DNS server for clients.
`Edmonton(dhcp-config)#``domain-name fakedomainname.ca`	Defines the domain name for clients.
`Edmonton(dhcp-config)#``lease 12 14 30`	Sets the lease time to be 12 days, 14 hours, 30 minutes.
`Edmonton(dhcp-config)#``exit`	Returns to global configuration mode.
`Edmonton(config)#``exit`	Returns to privileged mode.
`Edmonton#``copy running-config startup-config`	Saves the configuration to NVRAM.

Gibbons Router

`router>``enable`	Enters privileged mode.
`router#``configure terminal`	Enters global configuration mode.
`router(config)#``host Gibbons`	Sets the host name.
`Gibbons(config)#``interface fastethernet 0/0`	Enters interface configuration mode.
`Gibbons(config-if)#``description LAN Interface`	Sets the local description of the interface.
`Gibbons(config-if)#``ip address 192.168.3.1 255.255.255.0`	Assigns an IP address and netmask.
`Gibbons(config-if)#``ip helper-address 192.168.1.2`	DHCP broadcasts will be forwarded as a unicast to this address rather than be dropped.
`Gibbons(config-if)#``no shutdown`	Enables the interface.
`Gibbons(config-if)#``interface serial 0/0/1`	Enters interface configuration mode.
`Gibbons(config-if)#``description Link to Edmonton Router`	Sets the local description of the interface.
`Gibbons(config-if)#``ip address 192.168.1.1 255.255.255.252`	Assigns an IP address and netmask.
`Gibbons(config-if)#``no shutdown`	Enables the interface.
`Gibbons(config-if)#``exit`	Returns to global configuration mode.
`Gibbons(config)#``router eigrp 10`	Enables the EIGRP routing process for autonomous system 10.
`Gibbons(config-router)#``network 192.168.3.0`	Advertises the 192.168.3.0 network.
`Gibbons(config-router)#``network 192.168.1.0`	Advertises the 192.168.1.0 network.
`Gibbons(config-router)#``exit`	Returns to global configuration mode.
`Gibbons(config)#``exit`	Returns to privileged mode.
`Gibbons#``copy running-config startup-config`	Saves the configuration to NVRAM.

NOTE

The subnets of the VLANs are directly connected to the switch. Routing between these subnets does not require a dynamic routing protocol. If the switch is to be connected to a router and remote communication is desired, a routing protocol must be enabled and networks advertised:

3750Switch(config)#router eigrp 1
3750Switch(config-router)#network 172.16.0.0
3750Switch(config-router)#exit
3750Switch(config)#

10. Configuring Cisco Express Forwarding | Next Section Previous Section

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