Table Of Contents
Configuring Routing Between VLANs with IEEE 802.1Q Encapsulation
IEEE 802.1Q Encapsulation Configuration Task List
Configuring AppleTalk Routing over IEEE 802.1Q
Configuring AppleTalk on the Subinterface
Defining the VLAN Encapsulation Format
Configuring IP Routing over IEEE 802.1Q
Defining the VLAN Encapsulation Format
Assigning IP Address to Network Interface
Configuring IPX Routing over IEEE 802.1Q
Defining the VLAN Encapsulation Format
Configuring NetWare on the Subinterface
IEEE 802.1Q Encapsulation Configuration Examples
Configuring AppleTalk over IEEE 802.1Q Example
Configuring IP Routing over IEEE 802.1Q Example
Configuring IPX Routing over IEEE 802.1Q Example
Configuring Routing Between VLANs with IEEE 802.1Q Encapsulation
This chapter describes the required and optional tasks for configuring routing between VLANs with IEEE 802.1Q encapsulation. For a complete description of VLAN commands used in this chapter, refer to the "Cisco IOS Switching Commands" chapter in the Cisco IOS Switching Services Command Reference. For documentation of other commands that appear in this chapter, you can use the command reference master index or search online.
The IEEE 802.1Q protocol is used to interconnect multiple switches and routers and for defining VLAN topologies. IEEE 802.1Q support is currently available for Fast Ethernet interfaces.
IEEE 802.1Q Encapsulation Configuration Task List
You can configure routing between any number of VLANs in your network. This section documents the configuration tasks for each protocol supported with IEEE 802.1Q encapsulation. The basic process is the same, regardless of the protocol being routed. It involves:
•
Enabling the protocol on the router.
•
•
•
The configuration processes documented in this chapter include the following:
•
•
•
Configuring AppleTalk Routing over IEEE 802.1Q
AppleTalk can be routed over virtual LAN (VLAN) subinterfaces using the IEEE 802.1Q VLAN encapsulation protocol. AppleTalk Routing provides full-feature Cisco IOS software AppleTalk support on a per-VLAN basis, allowing standard AppleTalk capabilities to be configured on VLANs.
To route AppleTalk over IEEE 802.1Q between VLANs, you need to customize the subinterface to create the environment in which it will be used. Perform these tasks in the order in which they appear:
•
•
Enabling AppleTalk Routing
To enable AppleTalk routing on IEEE 802.1Q interfaces, use the following command in global configuration mode:
Note
Configuring AppleTalk on the Subinterface
After you enable AppleTalk globally and define the encapsulation format, you need to enable it on the subinterface by specifying the cable range and naming the AppleTalk zone for each interface. To enable the AppleTalk protocol on the subinterface, use the following commands in interface configuration mode:
Defining the VLAN Encapsulation Format
To define the VLAN encapsulation format as IEEE 802.1Q, use the following commands in interface configuration mode:
Configuring IP Routing over IEEE 802.1Q
IP routing over IEEE 802.1Q extends IP routing capabilities to include support for routing IP frame types in VLAN configurations using the IEEE 802.1Q encapsulation.
To route IP over IEEE 802.1Q between VLANs, you need to customize the subinterface to create the environment in which it will be used. Perform these tasks in the order in which they appear:
•
•
Enabling IP Routing
IP routing is automatically enabled in the Cisco IOS software for routers. To reenable IP routing if it has been disabled, use the following command in global configuration mode:
Once you have IP routing enabled on the router, you can customize the characteristics to suit your environment. If necessary, refer to the IP configuration chapters in the Cisco IOS IP and IP Routing Configuration Guide for guidelines on configuring IP.
Defining the VLAN Encapsulation Format
To define the encapsulation format as IEEE 802.1Q, use the following commands in interface configuration mode:
Assigning IP Address to Network Interface
An interface can have one primary IP address. To assign a primary IP address and a network mask to a network interface, use the following command in interface configuration mode:
A mask identifies the bits that denote the network number in an IP address. When you use the mask to subnet a network, the mask is then referred to as a subnet mask.
Configuring IPX Routing over IEEE 802.1Q
IPX Routing over IEEE 802.1Q VLANs extends Novell NetWare routing capabilities to include support for routing Novell Ethernet_802.3 encapsulation frame types in VLAN configurations. Users with Novell NetWare environments can configure Novell Ethernet_802.3 encapsulation frames to be routed using IEEE 802.1Q encapsulation across VLAN boundaries.
To configure Cisco IOS software on a router with connected VLANs to exchange IPX Novell Ethernet_802.3 encapsulated frames, perform these tasks in the order in which they are appear:
•
•
Enabling NetWare Routing
To enable IPX routing on IEEE 802.1Q interfaces, use the following command in global configuration mode:
Defining the VLAN Encapsulation Format
To define the encapsulation format as IEEE 802.1Q, use the following commands in interface configuration mode:
Configuring NetWare on the Subinterface
After you enable NetWare globally and define the VLAN encapsulation format, you may need to enable the subinterface by specifying the NetWare network number. Use this command in interface configuration mode:
IEEE 802.1Q Encapsulation Configuration Examples
This section provides configuration examples for each of the protocols described in this feature guide. It includes these examples:
•
•
•
Configuring AppleTalk over IEEE 802.1Q Example
This configuration example shows AppleTalk being routed on VLAN 100.
!appletalk routing!interface fastethernet 0/0.100encapsulation dot1q 100appletalk cable-range 100-100 100.1appletalk zone eng!Configuring IP Routing over IEEE 802.1Q Example
This configuration example shows IP being routed on VLAN 101.
!ip routing!interface fastethernet 0/0.101encapsulation dot1q 101ip addr 10.0.0.11 255.0.0.0!Configuring IPX Routing over IEEE 802.1Q Example
This configuration example shows IPX being routed on VLAN 102.
!ipx routing!interface fastethernet 0/0.102encapsulation dot1q 102ipx network 100!VLAN Commands
This section provides an alphabetical listing of all the VLAN commands that are new or specific to the Cisco 1751 router. All other commands used with this feature are documented in the Cisco IOS Release 12.1T command reference documents.
clear vlan statistics
To remove virtual LAN statistics from any statically or system configured entries, use the clear vlan statistics privileged EXEC command.
clear vlan statistics
Syntax Description
This command has no arguments or keywords.
Default
No default behavior or values.
Command Mode
Privileged EXEC
Example
The following example clears VLAN statistics:
clear vlan statisticsdebug vlan packet
Use the debug vlan packet privileged EXEC command to display general information on virtual LAN (VLAN) packets that the router received but is not configured to support. The no form of this command disables debugging output.
debug vlan packet
no debug vlan packetSyntax Description
This command has no arguments or keywords.
Usage Guidelines
The debug vlan packet command displays only packets with a VLAN identifier that the router is not configured to support. This command allows you to identify other VLAN traffic on the network. Virtual LAN packets that the router is configured to route or switch are counted and indicated when you use the show vlans command.
Example
The following is sample output from the debug vlan packet output.
Router# debug vlan packetVirtual LAN packet information debugging is onencapsulation dot1q
To enable IEEE 802.1Q encapsulation of traffic on a specified subinterface in virtual LANs, use the encapsulation dot1q command in subinterface configuration mode. IEEE 802.1Q is a standard protocol for interconnecting multiple switches and routers and for defining VLAN topologies.
encapsulation dot1q vlan-id
Syntax Description
Default
Disabled
Command Mode
Subinterface configuration
Usage Guidelines
IEEE 802.1Q encapsulation is configurable on Fast Ethernet interfaces.
Example
The following example encapsulates VLAN traffic using the IEEE 802.1Q protocol for VLAN 100:
interface fastethernet 0/0.100encapsulation dot1q 100show vlans
To view virtual LAN (VLAN) subinterfaces, use the show vlans privileged EXEC command.
show vlans
Syntax Description
This command has no arguments or keywords.
Command Mode
Privileged EXEC
Example
The following is sample output from the show vlans command:
1751_2# show vlansVirtual LAN ID: 1 (IEEE 802.1Q Encapsulation)vLAN Trunk Interface: FastEthernet0/0This is configured as native Vlan for the following interface(s):FastEthernet0/0Protocols Configured: Address: Received: Transmitted:Virtual LAN ID: 100 (IEEE 802.1Q Encapsulation)vLAN Trunk Interface: FastEthernet0/0.100Protocols Configured: Address: Received: Transmitted:IP 100.0.0.2 10 10Virtual LAN ID:2500 (IEEE 802.1Q Encapsulation)vLAN Trunk Interface: FastEthernet0/0.200Protocols Configured: Address: Received: Transmitted:IP 200.0.0.2 5 5Table 1 describes the fields shown in the display.
