Chapter 23 VLAN Stacking

The following table describes the labels in this screen.

Table 59 Advanced Application > VLAN Stacking

LABEL

DESCRIPTION

Active

Select this checkbox to enable VLAN stacking on the Switch.

 

 

Port

The port number identifies the port you are configuring.

*Settings in this row apply to all ports.

Use this row only if you want to make some settings the same for all ports. Use this row first to set the common settings and then make adjustments on a port- by-port basis.

 

Note: Changes in this row are copied to all the ports as soon as you make

 

them.

 

 

Role

Select Normal to have the Switch ignore frames received (or transmitted) on

 

this port with VLAN stacking tags. Anything you configure in SPVID and

 

Priority of the Port-based QinQ or the Selective QinQ screen are ignored.

 

Select Access Port to have the Switch add the SP TPID tag to all incoming

 

frames received on this port. Select Access Port for ingress ports at the edge

 

of the service provider's network.

 

Select Tunnel Port (available for Gigabit ports only) for egress ports at the

 

edge of the service provider's network. Select Tunnel Port to have the Switch

 

add the Tunnel TPID tag to all outgoing frames sent on this port.

 

In order to support VLAN stacking on a port, the port must be able to allow

 

frames of 1526 Bytes (1522 Bytes + 4 Bytes for the second tag) to pass

 

through it.

 

 

Tunnel

TPID is a standard Ethernet type code identifying the frame and indicates

TPID

whether the frame carries IEEE 802.1Q tag information. Enter a four-digit

 

hexadecimal number from 0000 to FFFF that the Switch adds in the outer VLAN

 

tag of the frames sent on the tunnel port(s). The Switch also uses this to check

 

if the received frames are double-tagged.

 

The value of this field is 0x8100 as defined in IEEE 802.1Q. If the Switch needs

 

to communicate with other vendors’ devices, they should use the same TPID.

 

Note: You can define up to four different tunnel TPIDs (including 8100) in

 

this screen at a time.

 

 

Apply

Click Apply to save your changes to the Switch’s run-time memory. The Switch

 

loses these changes if it is turned off or loses power, so use the Save link on

 

the top navigation panel to save your changes to the non-volatile memory

 

when you are done configuring.

 

 

Cancel

Click Cancel to begin configuring this screen afresh.

23.4.1 Port-based Q-in-Q

Port-based Q-in-Q lets the Switch treat all frames received on the same port as the same VLAN flows and add the same outer VLAN tag to them, even they have different customer VLAN IDs.

 

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XGS-4526/4528F/4728F User’s Guide