sub-switch

To create VLANs that lets tagged and untagged frames to be bridged and set up the nested VLAN featuer, use the command sub-switch in Global Configuration Mode.

sub-switch

sub-switch

{ [nested] } { vlan } { <vlan-id> } { ([<interface-type> } { <0/a-b,0/c,...>] } { [<interface-type> } { <0/a-b,0/c,...>]) }

Mode

Global Configuration Mode

Nested VLAN Feature

The nested VLAN feature allows a set of port on the switch to be combined into smaller independent switch that leave the Ethernet frames unchanged from entry to exit while still providing the correct bridging to the destination. This allows tagged and untagged frames to coexist within the nested VLAN.

The following network can be set up with the “sub-switch nested vlan 50 gi 0/9-12" command allowing for example of an untagged path and a VLAN 5 path through the switch.

In HSR/PRP networks, both tagged and untagged frames can originate from a single redundant node depending on the protocol being used. The nested VLAN feature will allow bothtypes of frames to reach there destinations by coexisting in the same nested VLAN. The HSR QuadBox has a similar built in feature to allow tagged and untagged frames through, as shown in the following diagram.

Parameters

Parameter	Type	Description
`nested`		Enter to select the option for nested VLAN feature.
`vlan`		Enter to set the subnet mask for the configured IP address. The configured subnet mask should be in the same subnet of the network in which the switch is placed
`vlan-id`	Integer	Enter to configure the number of high-order bits in the IP address. These bits are common among all hosts within a network. This value ranges from 1 to 32.
`interface-type <0/a-b, 0/c, ...>`		Enter to set the list of interfaces or a specific interface identifier. This value is a combination of slot number and port number separated by a slash. Use comma as a separator without space while configuring list of interfaces. Example: 0/1,0/3 or 1,3.
`gigabitethernet`		Enter for Gigabitethernet.
`extreme-ethernet`		Enter for Extreme-Ethernet.
`serial`		Enter for serial.

Examples

The command below shows an example for an untagged path and a VLAN 5 path through the switch/

iS5Comm# (config)# sub-switch nested vlan 50 gigabit 0/9-12