Adding or Replacing a Customer VLAN for Q-in-Q Tunneling

When configuring selective Q-in-Q tunneling, you can add or replace a customer VLAN (CVLAN). The ability to add or replace a CVLAN enhances traffic management capabilities in environments where complex VLAN handling is required. When Internet Protocol over Ethernet (IPoE) service-tagged (S-tag) and customer-tagged (C-tag) VLANs are enabled, traffic from different clients or tenants can be segregated, ensuring the efficient use of available VLAN IDs and simplifying the network configuration.

With configuration of IPoE S-tag and C-Tag VLANs for Q-in-Q tunneling, the device can identify incoming untagged frames. It then adds both an S-tag (service VLAN or outer tag) and a C-tag (customer VLAN or inner tag) to each frame. Every port and every CPE is uniquely identified by a combination of the S-tag and C-tag. Similarly, the device can identify frames tagged with a common C-tag. Upon receipt of a tagged frame, the device adds the S-tag and replaces the common C-tag with a unique C-tag for each CPE. VLAN priority bits for Quality of Service (QoS) are preserved. For reverse traffic, the device replaces the unique C-tag with the original common C-tag for each frame before it reaches the CPE.

Note: IPoE S-tag and C-Tag VLANs are supported for ICX 8200 devices only.

Note: Selective Q-in-Q tunneling and Selective Q-in-Q tunneling with a CVLAN cannot co-exist.

The following task enables a device to add or replace new CVLANs for Q-in-Q tunneling.

Enter global configuration mode.
```
device# configure terminal
```

Configure an Ethernet interface.
```
device(config)# interface ethernet 1/1/1
```

Configure Q-in-Q tunneling and add a replacement CVLAN.
```
device(config-if-e1000-1/1/1)# qinq-tunnel cvlan 1 new-cvlan 2 svlan 4000
```
This example configures Q-in-Q tunneling for a specified CVLAN, adds a replacement CVLAN, and specifies a service VLAN to tunnel the CVLANs.

The following example configures Q-in-Q tunneling for a specified CVLAN, adds a replacement CVLAN, and specifies a service VLAN to tunnel the CVLANs.

device# configure terminal
device(config)# interface ethernet 1/1/1
device(config-if-e1000-1/1/1)# qinq-tunnel cvlan 1 new-cvlan 2 svlan 4000

The following example shows information for Q-in-Q tunnels, including information for the replacement CVLAN.

device> show qinq-tunnel
Total number of VLAN(s) tunneled: 2
Total number of HW resources used: 2
qinq enabled port(s): 1/1/1, 1/1/2

Port: 1/1/1    Number of CVLANs tunneled: 1
  Service VLAN: 200      Original VLAN: None (Untagged)    New CVLAN: 100

Port: 1/1/2    Number of CVLANs tunneled: 1
  Service VLAN: 200      Original VLAN: 100    New CVLAN: 75