HVPLS with Dot1q Tunneling QinQ in the Access Layer

As in the case of EoMPLS, dot1q tunneling (QinQ) is possible with VPLS. This means that the customer VLANs can be encapsulated into another VLAN (the provider VLAN, or P-VLAN), allowing a multi-VLAN switched customer network to be transparently transported between multiple sites connected to an MPLS network. This P-VLAN is mapped to one VFI on the N-PE router. If the CE equipment is a router, you can configure the Ethernet interface toward the PE

router as a trunk interface by configuring 802.1Q subinterfaces, each with a specific VLAN number. If the CE equipment is an Ethernet switch, you can configure the Ethernet interface toward the PE router as an 802.1Q trunk interface with a certain number of VLANs. Look at the network in Figure 11-8. The customer VLANs are 200 to 250. These VLANs are tunneled into VLAN 111 (the P-VLAN) on the service provider side by configuring dot1q tunneling and access VLAN 111 on the Ethernet interface that faces the CE.

Figure 11-8 H-VPLS with Dot1q Tunneling in the Access Layer cust-one

Figure 11-8 H-VPLS with Dot1q Tunneling in the Access Layer cust-one

dotlqtunnel 200-250 Example 11-12 shows the configuration needed on the PE router for dot1q tunneling. Example 11-12 Dot1q Tunneling

VPLS-PE-1#show running-config interface fas 4/2

interface FastEthernet4/2 no ip address switchport switchport access vlan 111 switchport mode dot1q-tunnel spanning-tree bpdufilter enable

The VFI is configured for VLAN 111 on the PE router. The frames are then transported across the MPLS network with one 802.1Q tag (VLAN 200-250) and two MPLS labels. Because the VFI is configured per VLAN and all the VLANs of one customer are encapsulated into one service provider VLAN, the service provider needs to use only one VLAN per customer when using the dot1q tunneling method in combination with VPLS. The big advantages for the service provider in deploying dot1q tunneling are saving VLANs and transporting customer VLANs transparently, so that the service provider does not know which VLANs need to be transported and to which remote sites.

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