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With the introduction of the Cisco IOS IEEE 802.1Q Support feature, Cisco IOS now supports 802.1Q VLAN encapsulation, in addition to the currently supported ISL and IEEE 802.10 SDE encapsulations. VLANs can now be implemented using 802.1Q encapsulation amoung switches that support this standard. IEEE 802.1Q support is currently available for Fast Ethernet interfaces.
VLANs can now implemented with Cisco IOS platforms in environments where the IEEE 802.1Q encapsulation standard is required.
This feature is supported on these platforms:
None.
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
The configuration processes documented in this feature guide include the following:
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:
To enable AppleTalk routing on IEEE 802.1Q interfaces, use this command in global configuration mode:
| Command | Purpose |
|---|---|
Enable AppleTalk routing globally. |
To define the VLAN encapsulation format as IEEE 802.1Q, use the following commands in interface configuration mode:
| Step | Command | Purpose | ||
|---|---|---|---|---|
| Specify the subinterface the VLAN will use. | |||
| encapsulation dot1q vlan-identifier | Define the encapsulation format as IEEE 802.1Q (dot1q), and specify the VLAN identifier. |
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:
| Step | Command | Purpose | ||
|---|---|---|---|---|
| Assign the AppleTalk cable range and zone for the subinterface. | |||
| Assign the AppleTalk zone for the subinterface. |
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:
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:
| Command | Purpose |
|---|---|
ip routing | Enable IP routing on the router. |
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 Network Protocols Configuration Guide, Part 1 for guidelines on configuring IP.
To define the encapsulation format as IEEE 802.1Q, use the following commands in interface configuration mode:
| Step | Command | Purpose | ||
|---|---|---|---|---|
| Specify the subinterface on which IEEE 802.1Q will be used. | |||
| encapsulation dot1q vlanid | Define the encapsulation format as IEEE 802.1Q (dot1q), and specify the VLAN identifier |
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:
| Command | Purpose |
|---|---|
ip address ip-address mask | Set a primary IP address for an interface. |
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.
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:
To enable IPX routing on IEEE 802.1Q interfaces, use the following command in global configuration mode:
| Command | Purpose |
|---|---|
Enable IPX routing globally. |
To define the encapsulation format as IEEE 802.1Q, use the following commands in interface configuration mode:
| Step | Command | Purpose | ||
|---|---|---|---|---|
| Specify the subinterface on which IEEE 802.1Q will be used. | |||
| encapsulation dot1q vlan-identifier | Define the encapsulation format as IEEE 802.1Q and specify the VLAN identifier. |
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:
| Command | Purpose |
|---|---|
Specify the IPX network number. |
This section provides configuration examples for each of the protocols described in this feature guide. It includes these examples:
This configuration example shows AppleTalk being routed on VLAN 100.
! appletalk routing ! interface fastethernet 4/1.100 encapsulation dot1q 100 appletalk cable-range 100-100 100.1 appletalk zone eng !
This configuration example shows IP being routed on VLAN 101.
! ip routing ! interface fastethernet 4/1.101 encapsulation dot1q 101 ip addr 10.0.0.11 255.0.0.0 !
This configuration example shows IPX being routed on VLAN 102.
! ipx routing ! interface fastethernet 4/1.102 encapsulation dot1q 102 ipx network 100 !
This section documents new or modified commands. All other commands used with this feature are documented in the Cisco IOS Release 12.0 command references.
Use the encapsulation dot1q subinterface command to enable IEEE 802.1Q encapsulation of traffic on a specified subinterface in virtual LANs. IEEE 802.1Q is a standard protocol for interconnecting multiple switches and routers, and for defining VLAN topologies.
encapsulation dot1q vlan-id
vlan-id | Virtual LAN identifier. The allowed range is 1 to 1000 |
Disabled
Subinterface configuration
This command first appeared in Cisco IOS Release 12.0(1)T.
IEEE 802.1Q encapsulation is configurable on Fast Ethernet interfaces.
The following example encapsulates VLAN traffic using the IEEE 802.1Q protocol for VLAN 100:
interface fastethernet 4/1.100 encapsulation dot1q 100
encapsulation isl
encapsulation sde
Posted: Thu Mar 2 18:36:21 PST 2000
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