24.6.2 Creating a protocol VLAN

(1) Creating a Protocol to Identify VLAN

Points to note

When a protocol VLAN is set, the vlan-protocol command sets the distinguishing protocol before VLAN creation. A protocol name and a protocol value are set for a protocol. Multiple protocol values can be associated with a single name.

Because the IPv4 protocol requires that both an IPv4 Ether-type and ARP Ether-type are specified at the same time, two protocol values are associated with IPv4.

Command examples

1. (config)# vlan-protocol IPV4 ethertype 0800 ethertype 0806

   Creates a protocol named IPV4. The IPv4 Ether-type value 0800 and ARP Ether-type value 0806 are associated as protocol values.

   Note that protocol judgment for this setting is only for frames in Ethernet V2 format.

2. (config)# vlan-protocol IPV6 ethertype 86dd

   Creates a protocol named IPV6. The IPv6 Ether-type value 86DD is associated as the protocol value.

(2) Creating a Protocol VLAN

Points to note

The example below shows how to create a protocol VLAN. When a VLAN is created, a VLAN ID and the protocol-based parameter are specified. The created protocol is specified as the protocol for distinguishing VLANs.

Command examples

1. (config)# vlan 10,20 protocol-based

   Creates VLANs 10 and 20 as protocol VLANs. Because VLANs 10 and 20 are used as the same IPv4 protocol VLAN, setting is done in a batch operation. This command switches to VLAN configuration mode.

2. (config-vlan)# protocol IPV4

   (config-vlan)# exit

   Specifies the created IPv4 protocol as the protocol for distinguishing VLANs 10 and 20.

3. (config)# vlan 30 protocol-based

   (config-vlan)# protocol IPV6

   Creates VLAN 30 as a protocol VLAN. The created IPv6 protocol is specified as a protocol for distinguishing VLAN 30.

(3) Configuring Protocol Ports

Points to note

The protocol port set as the port for distinguishing VLANs by protocol for protocol VLANs handles untagged frames.

Command examples

1. (config)# interface range gigabitethernet 1/0/1-2

   Switches ports 1/0/1 and 1/0/2 to Ethernet interface configuration mode. Because ports 1/0/1 and 1/0/2 use the same configuration, they are specified in a batch operation.

2. (config-if-range)# switchport mode protocol-vlan

   (config-if-range)# switchport protocol vlan 10

   (config-if-range)# exit

   Sets ports 1/0/1 and 1/0/2 as the protocol port. Then, sets VLAN 10.

3. (config)# interface range gigabitethernet 1/0/3-4

   (config-if-range)# switchport mode protocol-vlan

   (config-if-range)# switchport protocol vlan 20

   (config-if-range)# exit

   Sets ports 1/0/3 and 1/0/4 as protocol ports. Also, set VLAN 20.

4. (config)# interface gigabitethernet 1/0/4

   (config-if)# switchport protocol vlan add 30

   Adds VLAN 30 to port 1/0/4. Two types of protocol VLAN, IPv4 and IPv6 are set for port 1/0/4.

Notes

The switchport protocol vlan command does not add to the previous configuration. Instead, it replaces the settings in the specified <vlan id list>. To add and remove VLANs for ports on which protocol VLANs are already running, use the switchport protocol vlan add command and switchport protocol vlan remove command.

(4) Configuring Trunk Ports

Points to note

For protocol VLANs, ports handling tagged frames are set as trunk ports, and VLANs are set for the trunk ports.

Command examples

1. (config)# interface gigabitethernet 1/0/5

   Switches to the Ethernet interface configuration mode for ports 1/0/5.

2. (config-if)# switchport mode trunk

   (config-if)# switchport trunk allowed vlan 10,20,30

   Configure port 1/0/5 as a trunk port. Then, sets VLAN 10, VLAN 20 and VLAN 30.