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Advantages

Using S-VLAN tunnels provides an easier and faster way to configure Ethernet layer 2 services over MPLS than using standard S-VLANs. For example, consider the network configuration shown in Figure 19.

Figure 19: S-VLAN Tunnels for Ethernet Layer 2 Services over MPLS

Image g013606.gif

In this example, traffic from three VLAN subinterfaces must traverse the MPLS network. To accomplish this using standard S-VLANs, you issue the following commands to configure three separate S-VLANs with the same S-VLAN ID value and different VLAN IDs, as follows:



host1(config-if)#svlan id 33 10 

host1(config-if)#svlan id 33 20 

host1(config-if)#svlan id 33 30

By contrast, using an S-VLAN tunnel achieves the same result, but requires you to issue only a single svlan id command with the keyword any in place of the VLAN ID value. For example, the following command creates a single interface that tunnels traffic from VLANs configured with an S-VLAN ID of 33 and any VLAN ID to the same destination across the MPLS network. In effect, this command tunnels traffic from all three VLANs shown in Figure 19.



host1(config-if)#svlan id 33 any

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