Configuring S-VLANs over Bridged Ethernet

S-VLANs over bridged Ethernet support the same set of higher-level protocols as VLANs over bridged Ethernet. You configure S-VLANs over bridged Ethernet in the same way that you configure VLANs over bridged Ethernet, with the addition of certain commands.

Like VLANs, configuring S-VLANs over bridged Ethernet interfaces consists of two basic tasks:

Configure the layers up to and including the S-VLAN subinterface.
Configure the higher-level protocols above the S-VLAN subinterface.

Before you can remove an S-VLAN subinterface, you must remove the upper-layer interface stack.

Note: S-VLAN oversubscription is not supported on bridged Ethernet interfaces.

For more information about specifying ATM interfaces and subinterfaces, see Interface Types and Specifiers in JunosE Command Reference Guide.

Configuring S-VLAN Subinterfaces over Bridged Ethernet

To configure an S-VLAN subinterface over bridged Ethernet:

Create an ATM 1483 subinterface and associated PVC.
host1(config)#interface atm 3/1.1 host1(config-subif)#atm pvc 1 5 33 aal5snap 0 0 0
Specify bridged Ethernet as the encapsulation method for the ATM 1483 subinterface.
host1(config-subif)#encapsulation bridge1483
Create a VLAN major interface by specifying VLAN as the encapsulation method for the bridged Ethernet interface.
host1(config-subif)#encapsulation vlan
Create a VLAN subinterface to carry the higher-level protocols by adding a subinterface number to the interface identification command.
host1(config-subif)#interface atm 3/1.1.1
Assign an S-VLAN ID and a VLAN ID for the subinterface.
host1(config-subif)#svlan id 4 255
Assign an S-VLAN Ethertype.
host1(config-subif)#svlan ethertype 9200

Proceed to Configuring Higher-Level Protocols over S-VLANs for information about configuring higher-level protocols over the S-VLAN subinterfaces.

svlan ethertype

Use to assign an Ethertype value for the S-VLAN subinterface.
Choose one of the following Ethertype values:
- 8100—Specifies Ethertype value 0x8100, as defined in IEEE Standard 802.1q
- 9100—Specifies Ethertype value 0x9100, which is the default
- 9200—Specifies Ethertype value 0x9200
Use an Ethertype value that matches the Ethertype value set on the customer premises equipment (CPE) to which your router connects.
Example
host1(config-if)#svlan ethertype 8100
Use the no version to restore the default value, 9100.
See svlan ethertype.

svlan id

Use to assign S-VLAN IDs and VLAN IDs to VLAN subinterfaces.
Use S-VLAN ID and VLAN ID numbers that are in the range 0–4095 and that are unique within the Ethernet interface.
Issue the svlan id command before any upper bindings are made, such as IP or PPPoE.
Example
host1(config-if)#svlan id 4 255
There is no no version.
See svlan id.

Configuring Higher-Level Protocols over S-VLANs

The procedures for configuring IP, PPPoE, and MPLS protocols over S-VLANs on bridged Ethernet interfaces are identical to the procedures for configuring these protocols over VLANs on bridged Ethernet interfaces.

This section provides an example for configuring PPPoE interfaces over S-VLAN subinterfaces configured on bridged Ethernet. For descriptions of the commands used in this procedure, see Configuring Higher-Level Protocols over VLANs.

To configure PPPoE over S-VLAN over a bridged Ethernet interface:

Follow the steps in Configuring S-VLAN Subinterfaces over Bridged Ethernet to configure the S-VLAN subinterface.
Create a PPPoE major interface on the S-VLAN subinterface.
host1(config-subif)#pppoe
Exit the subinterface context.
host1(config-subif)#exit
Create a PPPoE subinterface by adding a subinterface number to the interface identification command.
host1(config)#pppoe subinterface atm 3/1.1.1.1
Specify PPP as the encapsulation method on the interface.
host1(config-subif)#encapsulation ppp
Assign an IP address and mask to the interface.
host1(config-subif)#ip address 10.1.2.3 255.255.255.255