Cisco Systems A9014CFD manual Routed QinQ, Configuration Example

Chapter 8 Configuring Ethernet Virtual Connections

Configuring Other Features on EFPs

For Customer A, service instance 1 on Gigabit Ethernet port 0/1 is configured with the VLAN encapsulations used by the customer: C-VLANs 1–100. These are forwarded on bridge-domain 500. The service provider facing port is configured with a service instance on the same bridge-domain and with an encapsulation dot1q command matching the S-VLAN. The rewrite ingress pop 1 symmetric command also implies a push of the configured encapsulation on egress packets. Therefore, the original packets with VLAN tags between 1 and 100 are encapsulated with another S-VLAN (VLAN 30) tag when exiting Gigabit Ethernet port 0/2.

Similarly, for double- tagged (S-VLAN = 30, C-VLAN = 1–100) packets coming from the provider network, using the rewrite ingress pop 1 symmetric command enables the outer S-VLAN tag and forwards the original C-VLAN tagged frame over bridge-domain 500 out to Gigabit Ethernet port 0/1.

Customer B

Router (config)# interface gigabitethernet0/3

Router (config-if)#service instance 1 Ethernet

Router (config-if-srv)#encapsulation dot1q 1-200

Router (config-if-srv)# bridge-domain 500

Router (config)# interface gigabitethernet0/4

Router (config-if)#service instance 2 Ethernet

Router (config-if-srv)#encapsulation dot1q 40 second-dot1q 1-200

Router (config-if-srv)#rewrite ingress pop 1 symmetric

Router (config-if-srv)# bridge-domain 500

Routed QinQ

Cisco ASR 901 router supports pop 2 configuration.

Restrictions

•Pop 2 is not supported for MPLS, L2VPN, and MPLS VPN deployments.

•ACL and QOS configurations for pop2 EVC scenarios are not supported.

Configuration Example

This section provides the following sample configuration examples for routed QinQ on the Cisco ASR

901 Router:

Example: User to Network Interface

Gig 0/1 (Connected to BTS)

interface GigabitEthernet0/1 service instance 1 ethernet encapsulation dot1q 10

rewrite ingress tag pop 1 symmetric bridge-domain 100

int vlan 100

ip address 1.1.1.1 255.255.255.0

Example: Network to Network Interface/Core Router

interface GigabitEthernet0/2 service instance 2 ethernet

	Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
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