Cisco Cisco IOS Software Release 12.2(27)SBC

BACP—bandwidth allocation control protocol. Provides MLP peers with the ability to govern link 
utilization. After peers successfully negotiate BACP, they can use the bandwidth allocation protocol 
(BAP), which is a subset of BACP, to negotiate bandwidth allocation.

CBWFQ—class-based weighted fair queuing. Extends the standard WFQ functionality to provide 
support for user-defined traffic classes.

CHAP—Challenge Handshake Authentication Protocol. Security feature supported on lines using PPP 
encapsulation that prevents unauthorized access. CHAP does not itself prevent unauthorized access, but 
merely identifies the remote end. The router or access server then determines whether that user is 
allowed access.

DLCI—data-link connection identifier. Value that specifies a PVC or an SVC in a Frame Relay network. 
In the basic Frame Relay specification, DLCIs are locally significant (connected devices might use 
different values to specify the same connection). In the LMI extended specification, DLCIs are globally 
significant (DLCIs specify individual end devices). 

FIFO—first-in, first-out. Refers to a buffering scheme where the first byte of data entering the buffer is 
the first byte retrieved by the CPU. In telephony, FIFO refers to a queuing scheme where the first calls 
received are the first calls processed.

FIFO queuing—first-in, first-out queuing. FIFO involves buffering and forwarding of packets in the 
order of arrival. FIFO embodies no concept of priority or classes of traffic. There is only one queue, and 
all packets are treated equally. Packets are sent out on an interface in the order in which they arrive.

FRF.8—The Frame Relay/ATM PVC Service Interworking Implementation Agreement. 

FRF.12—The Frame Relay Fragmentation Implementation Agreement. 

LFI—link fragmentation and interleaving. Method of fragmenting large packets and then queuing the 
fragments between small packets.

MLP—multilink PPP. Method of splitting, recombining, and sequencing datagrams across multiple 
logical links.

PVC—permanent virtual circuit (or connection). Virtual circuit that is permanently established. PVCs 
save bandwidth associated with circuit establishment and teardown in situations where certain virtual 
circuits must exist all the time. In ATM terminology, this is called a permanent virtual connection. 

QoS—quality of service. Measure of performance for a transmission system that reflects its transmission 
quality and service availability.

RTP—Real-Time Transport Protocol. Provides end-to-end network transport functions suitable for 
applications that transmit real-time data (such as audio, video, or simulation data) over multicast or 
unicast network services.

VC—virtual circuit. Logical circuit created to ensure reliable communication between two network 
devices. A VC is defined by a VPI/VCI pair and can be either permanent or switched.

Creates a multilink bundle or enters multilink interface configuration mode.