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Tag Switching 9-15
Requirements
Requirements
• BCC cards of one of the following versions:
— BCC-3-64
— BCC-4-64
— BCC-4-128
• BPX switches require BXM cards to originate, terminate, or transfer tag switching connections.
List of Terms
The following terms are defined for a tag switching context only, not for general situations:
ATM edge TSR—A tag switching router that is connected to the ATM-TSR cloud through TC-ATM
interfaces. The ATM edge TSR adds tags to untagged packets and strips tags from tagged packets.
ATM-TSR—A tag switching router with a number of TC-ATM interfaces. The router forwards the
cells from these interfaces using tags carried in the VPI and/or VCI field.
BPX switch—The BPX switch is a carrier quality switch, with trunk and CPU hot standby
redundancy.
BPX-TSR—An ATM tag switch router consisting a tag switch controller (series 7200 or 7500
router) and a tag controlled switch (BPX switch).
BXM—Broadband Switch Module. ATM port and trunk card for the BPX switch.
CLI—Command line interface.
extended tag ATM interface—A new type of interface supported by the remote ATM switch driver
and a particular switch-specific driver that supports tag switching over an ATM interface on a
remotely controlled switch.
external ATM interface—One of the interfaces on the slave ATM switch other than the slave
control port. It is also referred to as an exposed ATM interface, because it is available for connections
outside of the tag controlled switch.
LCNs—A common pool of logical connection numbers is defined per port group. The partitions in
the same port group share these LCNs. New connections are assigned LCNs from the common pool.
master control port—A physical interface on a TSC that is connected to one end of a slave control
link.
Ships in the Night (SIN)—The ability to support both tag switching procedures and ATM Forum
protocols on the same physical interface, or on the same router or switch platform. In this mode, the
two protocol stacks operate independently.
slave ATM switch—An ATM switch that is being controlled by a TSC.
slave control link—A physical connection, such as an ATM link, between the TSC and the slave
switch, that runs a slave control protocol such as VSI.
slave control port—An interface that uses a TSC to control the operation of a slave ATM switch
(for example, VSI). The protocol runs on the slave control link.
remote ATM switch driver—A set of interfaces that allow IOS software to control the operation of
a remote ATM switch through a control protocol, such as VSI.
tag controlled switch—The tag switch controller and slave ATM switch that it controls, viewed
together as a unit.