Cisco Router and Security Device Manager 2.5 User Guide
Configuring LAN Connections
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LAN Wizard

Table Of Contents

LAN Wizard

Ethernet Configuration

LAN Wizard: Select an Interface

LAN Wizard: IP Address and Subnet Mask

LAN Wizard: Enable DHCP Server

LAN Wizard: DHCP Address Pool

DHCP Options

LAN Wizard: VLAN Mode

LAN Wizard: Switch Port

IRB Bridge

BVI Configuration

DHCP Pool for BVI

IRB for Ethernet

Layer 3 Ethernet Configuration

802.1Q Configuration

Trunking or Routing Configuration

Configure Switch Device Module

Configure Gigabit Ethernet Interface

Summary


LAN Wizard


The Cisco Router and Security Device Manager (Cisco SDM) LAN wizard guides you in the configuration of a LAN interface. The screen lists the LAN interfaces on the router. You can select any of the interfaces shown in the window, and click Configure to make the interface a LAN interface and configure it.

This window lists the router interfaces that were designated as inside interfaces in Startup configuration, and lists the Ethernet interfaces and switch ports that have not been configured as WAN interfaces. The list includes interfaces that have already been configured.

When you configure an interface as a LAN interface, Cisco SDM inserts the description text $ETH-LAN$ in the configuration file so that it recognizes the interface as a LAN interface in the future.

You can return to this screen as often as necessary to configure additional LAN interfaces.

Field Reference

Table 3-1 IP Address and Subnet Mask 

Element
Description

Interface

The name of the interface

Configure

To configure an interface you have selected, click Configure. If the interface has not been configured before, Cisco SDM will take you through the LAN Wizard to help you configure it. If the interface has been given a configuration using Cisco SDM, Cisco SDM displays an Edit window enabling you to change configuration settings.

The Configure button may be disabled if a LAN interface has been given a configuration that Cisco SDM does not support. For a list of such configurations, see Reasons Why an Ethernet Interface Configuration May Be Read-Only.


Ethernet Configuration

The wizard guides you through the configuration of an Ethernet interface on the LAN. You must provide the following information:

An IP address and subnet mask for the Ethernet interface

A DHCP address pool if you decide to use DHCP on this interface

The addresses of DNS and WINS servers on the WAN

A domain name

LAN Wizard: Select an Interface

Select the interface on which you want to configure a LAN connection in this window. This window lists interfaces that can support Ethernet LAN configurations.

LAN Wizard: IP Address and Subnet Mask

This window lets you configure an IP address and subnet mask for the Ethernet interface that you chose in the first window.

Field Reference

Table 3-2 IP Address and Subnet Mask 

Element
Description

IP Address

Enter the IP address for the interface in dotted decimal format. Your network administrator should determine the IP addresses of LAN interfaces. For more information, see IP Addresses and Subnet Masks.

Subnet Mask

Enter the subnet mask. Obtain this value from your network administrator. The subnet mask enables the router to determine how much of the IP address is used to define the network and host portions of the address.

Alternatively, select the number of network bits. This value is used to calculate the subnet mask. Your network administrator can tell you the number of network bits to enter.


LAN Wizard: Enable DHCP Server

This screen lets you enable a DHCP server on your router. A DHCP server automatically assigns reusable IP addresses to the devices on the LAN. When a device becomes active on the network, the DHCP server grants it an IP address. When the device leaves the network, the IP address is returned to the pool for use by another device.

Field Reference

Table 3-3 IP Address and Subnet Mask 

Element
Description

Enable DHCP Server

To configure the router as a DHCP server on this interface, click Yes.


LAN Wizard: DHCP Address Pool

This screen lets you configure the DHCP IP address pool. The IP addresses that the DHCP server assigns are drawn from a common pool that you configure by specifying the starting IP address in the range, and the ending address in the range.

For more information, see DHCP Address Pools.


Note If there are discontinuous address pools configured on the router, then the Starting IP and Ending IP address fields will be read-only.


Field Reference

Table 3-4 DHCP Address Pool 

Element
Description

Starting IP

Enter the beginning of the range of IP addresses for the DHCP server to use in assigning addresses to devices on the LAN. This is the lowest-numbered IP address in the range.

Ending IP

Enter the highest-numbered IP address in the range of IP addresses.

DNS Server and WINS Server Fields

If this window displays DNS Server and WINS Server fields, you can click DHCP Options for information on them.


DHCP Options

Use this window to configure DHCP options that will be sent to hosts on the LAN that are requesting IP addresses from the router. These are not options for the router that you are configuring; these are parameters that will be sent to the requesting hosts on the LAN. To set these properties for the router, click Additional Tasks on the Cisco SDM category bar, click DHCP, and configure these settings in the DHCP Pools window.

Field Reference

Table 3-5 IP Address and Subnet Mask 

Element
Description

DNS Server 1

The DNS server is typically a server that maps a known device name with its IP address. If you have DNS server configured for your network, enter the IP address for that device here.

DNS Server 2

If there is an additional DNS server on the network, you can enter the IP address for that server in this field.

Domain Name

The DHCP server that you are configuring on this router will provide services to other devices within this domain. Enter the name of the domain.

WINS Server 1

Some clients may require Windows Internet Naming Service (WINS) to connect to devices on the Internet. If there is a WINS server on the network, enter the IP address for the server in this field.

WINS Server 2

If there is an additional WINS server on the network, enter the IP address for the server in this field.


LAN Wizard: VLAN Mode

This screen lets you determine the type of VLAN information that will be carried over the switch port. Switch ports can be designated either to be in access mode, in which case they will forward only data that is destined for the VLAN to which they are assigned, or they can be designated to be in trunking mode, in which case they will forward data destined for all VLANs including the VLAN to which they are assigned.

If this switch port will be connected to a single device, such as a single PC or IP phone, or if this device will be connected to a port on a networking device, such as another switch, that is an access mode port, then select Single Device.

If this switch port will be connected to a port on a network device, such as another switch, that is a trunking mode, select Network Device.

Field Reference

Table 3-6 IP Address and Subnet Mask 

Element
Description

Single Device

If this switch port will be connected to a single device, such as a single PC or IP phone, or if this device will be connected to a port on a networking device, such as another switch, that is an access mode port, then choose Single Device.

Network Device

If this switch port will be connected to a port on a network device, such as another switch, that is a trunking mode, choose Network Device.


LAN Wizard: Switch Port

This screen lets you assign an existing VLAN number to the switch port or to create a new VLAN interface to be assigned to the VLAN switch port.

Field Reference

Table 3-7 IP Address and Subnet Mask 

Element
Description

Existing VLAN

If you want to assign the switch port to a VLAN that has already been defined, such as the default VLAN (VLAN 1), enter the VLAN ID number in the Network (VLAN) Identifier field.

New VLAN

If you want to create a new VLAN interface to which the switch port will be assigned, enter the new VLAN ID number in the New VLAN field, and then enter the IP address and subnet mask of the new VLAN logical interface in the IP Address and Subnet Mask fields.

Include this VLAN in an IRB bridge...

If you want the switch port to form part of a bridge with your wireless network, check this box. The other part of the bridge must be configured using the Wireless Application. The IP address and Subnet mask fields under New VLAN are disabled when this box is checked.


Launching the Wireless Application

After completing this LAN configuration, do the following to launch the Wireless Application and complete the bridging configuration.


Step 1 Select Wireless Application from the Cisco SDM Tools menu. The Wireless Application opens in a separate browser window.

Step 2 In the Wireless Application, click Wireless Express Security, and then click Bridging to provide the information to complete the bridging configuration.


IRB Bridge

If you are configuring a VLAN to be part of an IRB bridge, the bridge must be a member of a bridge group.

To create a new bridge group that this interface will be part of, click Create a new bridge group and enter a value in the range 1 through 255.

To have this VLAN be a member of an existing bridge group, click Join an existing bridge group, and select a bridge group.


Note When you complete the bridge configuration in the Wireless Application, you must use the same bridge group number entered in this screen.


Field Reference

Table 3-8 IP Address and Subnet Mask 

Element
Description

Create a new bridge group

To create a new bridge group that this interface will be part of, click Create a new bridge group and enter a value in the range 1 through 255.

Join an existing bridge group

To have this VLAN be a member of an existing bridge group, click Join an existing bridge group, and select a bridge group.


BVI Configuration

Assign an IP address and subnet mask to the BVI interface. If you selected an existing bridge group in the previous screen, the IP address and subnet mask will appear in this screen. You can change it, or leave the values unchanged.

Field Reference

Table 3-9 BVI Configuration 

Element
Description

IP Address

Enter the IP address for the interface in dotted decimal format. Your network administrator should determine the IP addresses of LAN interfaces. For more information, see IP Addresses and Subnet Masks.

Net Mask

Enter the subnet mask. Obtain this value from your network administrator. The subnet mask enables the router to determine how much of the IP address is used to define the network and host portions of the address.

Net Bits

Alternatively, select the number of network bits. This value is used to calculate the subnet mask. Your network administrator can tell you the number of network bits to enter.


DHCP Pool for BVI

When you configure the router as a DHCP server, you can create a pool of IP addresses that clients on the network can use. When a client logs off the network, the address it was using is returned to the pool for use by another host.

Field Reference

Table 3-10 DHCP Pool for BVI 

Element
Description

DHCP Server Configuration

If you want to have the router function as a DHCP server, check DHCP Server Configuration.

Start IP

Enter the starting IP address for the pool. Be sure to specify IP addresses in the same subnet as the IP address you gave the interface. For example, If you gave the interface an IP address of 10.10.22.1, with a subnet mask of 255.255.255.0, you have over 250 addresses available for the pool, and you might specify a start IP Address of 10.10.22.2.

End IP

Enter the ending IP address for the pool. Using the above example, the end IP address would be 10.10.22.254.


IRB for Ethernet

If your router has a wireless interface, you can use Integrated Routing and Bridging to have this interface form part of a bridge to the wireless LAN, and enable traffic destined for the wireless network to be routed through this interface. Click Yes if you want to configure this Layer 3 interface for Integrated Routing and Bridging.

If you do not want this interface to be used in bridge to the wireless interface, click No. You will still be able to configure it as a regular routing interface.

Layer 3 Ethernet Configuration

Cisco SDM supports Layer 3 Ethernet configuration on routers with installed 3750 switch modules. You can create VLAN configurations and designate router Ethernet interfaces as DHCP servers.

802.1Q Configuration

You can configure a VLAN that does not use the 802.1Q encapsulation protocol used for trunking connections. Provide a VLAN ID number, and check Native VLAN if you do not want the VLAN to use 802.1Q tagging.

If you want to use the 802.1Q tagging, leave the Native VLAN box unchecked.

Field Reference

Table 3-11 IP Address and Subnet Mask 

Element
Description

VLAN ID (1-4094)

Enter a VLAN ID number from 1 to 4094. Cisco SDM displays a message telling you to enter a different VLAN ID if the ID that you enter is already in use.

Native VLAN

If you do not want the VLAN to use 802.1Q tagging, check Native VLAN.

If you want the VLAN to use 802.1Q tagging, leave this box unchecked.


Trunking or Routing Configuration

You can configure Layer 3 Ethernet interfaces for 802.1Q trunking or for basic routing. If you configure the interface for 802.1Q trunking, you can configure VLANs on the interface, and you can configure a native VLAN that does not use the 802.1q encapsulation protocol. I f you configure the interface for routing, you cannot configure subinterfraces or additional VLANs on the interface.

Configure Switch Device Module

If you are configuring a Gigabit Ethernet interface for routing, you can provide information about the switch module in this window. It is not required that you provide this information.

You can provide an IP address and subnet mask for the switch module, and login credentials required to log on to the the switch module interface.

Check the box at the bottom of the screen if you want to log on to the switch module after providing the information in this wizard and delivering the configuration to the router.

Configure Gigabit Ethernet Interface

Provide IP address and subnet mask information for Gigabit Ethernet interfaces in this window. For more information on IP addresses and subnet masks, see LAN Wizard: IP Address and Subnet Mask.

Field Reference

Table 3-12 IP Address and Subnet Mask 

Element
Description

IP Address of Physical Interface

Enter the IP address and subnet mask for the physical Gigabit Ethernet interface in these fields.

IP Address of VLAN Subinterface

Provide the IP address and subnet mask for the VLAN subinterface that you want to create on the physical interface. These fields appear if you are configuring this interface for routing. These fields do not appear if you are configuring this interface for Integrated Routing and Bridging (IRB).


Summary

This window provides a summary of the configuration changes that you made for the interface you selected.

To save this configuration to the router's running configuration and leave this wizard:

Click Finish. Cisco SDM saves the configuration changes to the router's running configuration. Although the changes take effect immediately, they will be lost if the router is turned off.

If you checked Preview commands before delivering to router in the User Preferences window, the Deliver window appears. In this window you can view the CLI commands that you are delivering to the router.