Section 5-4. WAN Interfaces


5-4. WAN Interfaces

  • The Catalyst 5000 and 6000 series switches offer support for WAN interfaces to be added to the switch chassis.

  • WAN interfaces are only known to the Layer 3 switching processor and must be configured from an IOS interface.

  • The 5000 series switch allows for the addition of a RSM/VIP2 card, which can provide support for a variety of port adapter modules (PAMs) for WAN connectivity.

  • The 6000 series switch supports a FlexWAN card, which provides support for a variety of WAN PAMs for WAN connectivity.

  • In addition to the FlexWAN card, the 6000 series switch offers a variety of optical services modules, which can be connected to high-speed optical networks.

Configuration

WAN interfaces enable users to connect to remote services from the Catalyst switch chassis. These interfaces typically operate as Layer 3 interfaces and require some type of Layer 3 switching processor, such as an RSM or MSCF, to provide access and connectivity to the cards. The interfaces are accessible only in Cisco IOS Software, so they can only be configured from the Layer 3 switch processor or the switch must be running the Supervisor IOS.

NOTE

This section offers an abbreviated look at configuring some basic parameters for Layer 3 switching using these interfaces. For a more detailed look at these interfaces and WAN connectivity, see the "Further Reading" section at the end of this chapter.


Each of the following sections details the steps to configure the different WAN interfaces for basic network connectivity.

Configuring VIP2 WAN Interfaces

A VIP2 interface is a component that allows for PAMs to be installed into a subsystem of the route switch module. The VIP2 is a component of the RSM/VIP2 combination card. This card takes up two slots in the chassis of the Catalyst 5000 series switch. As a part of the RSM, it allows for the installation of a variety of Layer 3 interfaces into the switch, including WAN interfaces. The following steps show how to configure the WAN interfaces for a VIP2 PAM.

1.

Access the RSM.

To access the RSM, use the session command. You will configure the WAN interfaces from the RSM:

COS

 (privileged)session mod 


The mod number specifies the module number of the switch processor. Use the command show modules to locate the RSM if you do not know where it is located in the switch.

2.

Configure the WAN interface:

IOS

 (global) interface type bay/number 


In global configuration mode, use this command to create and access a WAN interface. The option type specifies the type of WAN interface. The bay indicates in which location in the VIP the WAN PAM is placed. The bays are numbered 0 and 1 from left to right. The number specifies the port number in a given bay.

NOTE

The VIP2 processor supports several different PAMs. Go to www.cisco.com/univercd/cc/td/doc/product/lan/cat5000/cnfg_nts/rsm/rsm_pa/index.htm for a complete listing of Layer 3 modules supported by this component.

3.

Assign a protocol address to the interface:

IOS

 (interface) ip address address netmask 


Use the appropriate command to configure the Layer 3 interface with network addressing. The example here shows configuration of an IP address. See Step 3 of the section "5-2: Layer 3 Ethernet Interfaces" for other protocol options.

4.

Enable the interface:

IOS

 (interface) no shutdown 


The default status of many Layer 3 interfaces is shutdown, which is a disabled state. To ensure that the interface is operational, you should enable the interface with the command no shutdown.

Configuring a FlexWAN Interface

The FlexWAN card for the 6000 series is similar to the VIP2 card for the 5000 series. This module allows for the installation of a limited number of WAN PAMs to be used by the Layer 3 switching processor for WAN connectivity. The major difference is that the FlexWAN card is not coupled with any other card (such as an RSM) and attaches directly to the backplane of the switch. However, the FlexWAN does require that an MSFC be installed into the switch before it will operate. The following steps describe the process for configuring the FlexWAN ports.

1.

Access the Layer 3 switching processor (for hybrid mode).

If the switching processor is a card that runs as a subsystem in a COS device, you need to access this device to perform any configuration. To access the device, use the session command. This command is not required for a switch running Supervisor IOS because you are communicating directly with the Layer 3 switch processor if you are running this software:

COS

 (privileged)session mod 


The mod number specifies the module number of the switch processor. Use the command show modules to locate this processor if you do not know where it is located in the switch.

NOTE

If the switch chassis contains two active MSFCs, the FlexWAN ports are available only to the MSFC in slot 15, or the active router if you are using configuration synchronization. If the active router or MSFC 15 fails, you must manually configure the ports on the remaining router before they will become operational again.

2.

Configure the WAN interface:

IOS

 (global) interface type slot/bay/number 


In global configuration mode, use this command to access the WAN interface. The type option specifies the type of WAN interface (for example, serial, hssi, or atm). The slot indicates the slot in the switch chassis, the bay is the bay number on the FlexWAN card (bays are numbered 0 to 1 from left to right), and interface number on the PAM (interface numbers start at 0).

NOTE

You can use only a select number of PAMs with a FlexWAN module. See www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/cfgnotes/flexwan/flex_pa/index.htm for a complete list of support adapters.

3.

Assign a protocol address to the interface:

IOS

 (interface) ip address address netmask 


Use the appropriate command to configure the Layer 3 interface with network addressing. The example here shows configuration of an IP address. See Step 3 of the section "5-2: Layer 3 Ethernet Interfaces" for other protocol options.

4.

Enable the interface:

IOS

 (interface) no shutdown 


The default status of many Layer 3 interfaces is shutdown, which is a disabled state. To ensure that the interface is operational, enable the interface with the command no shutdown.

Configuring a Gigabit Ethernet WAN Interface

The Gigabit Ethernet WAN OSM is a four-port gigabit module that you can use to connect to metropolitan area networks (MANs) for Gigabit WAN services. The card requires a 6500 series switch with a Supervisor 2 and MSFC2. Each port on this blade acts as a Layer 3 port and can be configured with an IP address only, along with a variety of traffic-control features. To provide basic configuration for these interfaces, use the following steps:

1.

Access the Layer 3 switching processor (for hybrid mode).

If the switching processor is a card that runs as a subsystem in a COS device, you need to access this device to perform any configuration. To access the device, use the session command. This command is not required for a switch running Supervisor IOS, because you are communicating directly with the Layer 3 switch processor:

COS

 (privileged)session mod 


The mod number specifies the module number of the switch processor. Use the command show modules to locate this processor if you do not know where it is located in the switch.

2.

Access the interface:

IOS

 (global) interface ge-wan slot/number 


In global configuration mode, use this command to access the interface. The type will be a ge-wan, the slot will be the chassis slot, and the number will be the port number.

3.

Assign an IP address:

IOS

 (interface) ip address address netmask 


Use this command to enable IP processing for the port. The Gigabit Ethernet WAN ports support only IP processing.

4.

Enable the interface:

IOS

 (interface) no shutdown 


The default status of many Layer 3 interfaces is shutdown, which is a disabled state. To ensure that the interface is operational, you should enable the interface with the command no shutdown.

Configuring a Packet-over-SONET Interface

The packet-over-SONET (POS) interfaces offer another method for connecting the 6500 series switches to high-speed metropolitan area networks. In addition to a 1-, 4-, or 16-port POS interface, these cards also offer 4 Gigabit Ethernet cards for connectivity to the core network. This card requires a 6500 series switch with a Supervisor 2 and MSFC2. Use the following steps to provide basic configuration for POS interfaces.

1.

Access the Layer 3 switching processor (for hybrid mode).

If the switching processor is a card that runs as a subsystem in a COS device, you need to access this device to perform any configuration. To access the device, use the session command. This command is not required for a switch running Supervisor IOS, because you are communicating directly with the Layer 3 switch processor:

COS

 (privileged)session mod 


The mod number specifies the module number of the switch processor. Use the command show modules to locate this processor if you do not know where it is located in the switch.

2.

Access the POS interface:

IOS

 (global) interface pos slot/port 


In global configuration mode, use this command to access the POS interface. The slot option designates the slot in the switch chassis, and the port option indicates which POS port you are configuring.

3.

Specify an encapsulation:

IOS

 (interface) encapsulation {hdlc | ppp} 


You need to ensure that the Layer 2 encapsulation between the devices is compatible. high-level data link control (HDLC) is typically used if attaching to another Cisco device; if not, use PPP.

4.

(Optional) Specify an clocking:

IOS

 (interface) clock source {line |)internal} 


If you are connecting two switches back-to-back using dark fiber, you need to configure one of the switches with the option clock source internal; otherwise, the default is line.

5.

Assign an IP address to the interface:

IOS

 (interface) ip address address netmask 


Use this command to enable IP processing for the port.

6.

Enable the interface:

IOS

 (interface) no shutdown 


The default status of many Layer 3 interfaces is shutdown, which is a disabled state. To ensure that the interface is operational, enable the interface with the command no shutdown.

Verifying Configurations

After you have configured your WAN interfaces, use the following command to verify configuration:

IOS

 (privileged) show interface type number 


Feature Example

This configuration shows an example of a 5500 (Core_switch_1) using a VIP2 with a serial interface connecting to a 6500 (Core_switch_2) using a FlexWAN interface across a Frame Relay network. The data-link connection identifier (DLCI) number for the 5500 is 110, and the DLCI for the 6500 is 120. In this example, the 6500 is running Supervisor IOS. Figure 5-3 shows the network topology associated with this configuration example.

Figure 5-3. Network Topology for WAN Interface Configuration Example


An example of the Core_switch_1 configuration follows:

 Core_switch_1> (enable)session 4 Core_switch_RSM>enable Core_switch_RSM#config t Core_switch_RSM(config)#interface serial 0/0 Core_switch_RSM(config-if)#encapsulation frame-relay Core_switch_RSM(config)#interface serial 0/0.110 Core_switch_RSM(config-if)#frame-relay interface-dlci 110 Core_switch_RSM(config-if)#ip address 192.168.255.5 255.255.255.252 Core_switch_RSM(config-if)#no shutdown Core_switch_RSM(config-if)#end Core_switch_RSM#copy running-config startup-config Core_switch_RSM#quit Core_switch_1> (enable) 

An example of the Core_switch_2 configuration running Supervisor IOS follows:

 Core_switch_2>enable Core_switch_2#config t Core_switch_2(config)#interface serial 7/0/0 Core_switch_2(config-if)#encapsulation frame-relay Core_switch_2(config)#interface serial 7/0/0.120 Core_switch_2(config-if)#frame-relay interface-dlci 120 Core_switch_2(config-if)#ip address 192.168.255.6 255.255.255.252 Core_switch_2(config-if)#no shutdown Core_switch_2(config-if)#end Core_switch_2#copy running-config startup-config 

NOTE

Although this configuration shows a 6500 using IOS to configure the FlexWAN, FlexWAN can be configured using the MSFC IOS in hybrid mode.




Cisco Field Manual. Catalyst Switch Configuration
Cisco Field Manual. Catalyst Switch Configuration
ISBN: 1587050439
EAN: N/A
Year: 2001
Pages: 150

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