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9-16 Cisco BPX 8600 Series Reference
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Tag switch controller (TSC)—An IOS platform that runs the generic tag switching software and is
capable of controlling the operation of an external ATM (or other type of) switch, making the
interfaces of the latter appear externally as TC-ATM interfaces.
tag switching router (TSR)—A Layer 3 router that forwards packets based on the value of a tag
encapsulated in the packets.
TC-ATM interface—A tag switching interface where tags are carried in the VPI/VCI bits of ATM
cells and where VC connections are established under the control of tag switching control software.
TFIB—Tag Forwarding Information Base (TFIB). A data structure and way of managing
forwarding in which destinations and incoming tags are associated with outgoing interfaces and tags.
TVC—Tag switched controlled virtual circuit (TVC). A virtual circuit (VC) established under the
control of tag switching. A TVC is not a PVC or an SVC. It must traverse only a single hop in a
tag-switched path (TSP), but may traverse several ATM hops only if it exists within a VP tunnel.
VP tunnel—In the context of ATM tag switching, a VP tunnel is a TC-ATM interface that traverses
one or more ATM switches that do not act as ATM-TSRs.
VSI—Virtual Switch Interface. The protocol that enables a TSC to control an ATM switch over an
ATM link.
VSI slave—In a hardware context, a switch or a port card that implements the VSI. In a software
context, a process that implements the slave side of the VSI protocol.
VSI master—In a hardware context, a device that controls a VSI switch (for example, a VSI tag
switch controller). In a software context, a process that implements the master side of the VSI
protocol.
Related Documents
• Tag Switching for the Cisco 7500/7200 Series Routers
• Cisco BPX 8600 Series Installation and Configuration
• Cisco BPX 8600 Series Reference
• Cisco WAN Switching Command Reference
Configuration Management
The BPX switch must be initially installed, configured, and connected to a network. Following this,
connections can be added to the BPX switch.
For tag switching, the BPX node must be enabled for tag switching.The BXM cards that will be used
to support tag switching connections must also be configured properly, including setting up
resources for the tag switching VSIs. In addition, a Tag Switch Controller (7200 or 7500 series
router) must be connected to one of the BXM cards configured for tag switching.
Instructions for configuring the BPX switch and BXM cards for tag switching are provided in the
next section.
Instructions for configuring the router are provided in the applicable tag switch controller
documents, such as the:
• Tag Switch Controller Documentation