Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 315)

Multi-Service IronWare Switching Configuration Guide 285
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Backbone Edge Bridge (BEB) operation
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FIGURE 46 S-VLAN keep mode
Port Based Untagged Frame with S-Tag Insertion
With S-VLAN keep mode it is also possible to insert an S-Tag on top of whatever tag(s) the original
packet may already have when it goes out into the PBB network. This is done by configuring a
port-based untagged endpoint with the desired S-VID as the Port's default VID and send port based
untagged packets into this port. When the corresponding packet (shown in
Figure 47 as a C-Tagged
packet) is switched towards an IB-endpoint into the PBB network, the BEB will insert the PBB
header as well as inserting an S-Tag with the S-VID set to the ingress port's configured VLAN value.
The S-Tag TPID will be set to whatever was configured as the system-wise S-Tag Ether Type value.