ASN.1 —Abstract Syntax Notation One. OSI language for describing data types independent of particular computer structures and representation
techniques. Described by ISO International Standard 8824.
BGP —Border Gateway Protocol. The exterior Border Gateway Protocol used to exchange routing information between routers in separate
autonomous systems. BGP uses Transmission Control Protocol (TCP). Because TCP is a reliable protocol, BGP does not experience
problems with dropped or fragmented data packets.
CEF —Cisco Express Forwarding. An advanced Layer 3 IP switching technology. CEF optimizes network performance and scalability
for networks with large and dynamic traffic patterns.
CE device —customer edge router. A router on the border between a VPN provider and a VPN customer that belongs to the customer.
community —In SNMP, a logical group of managed devices and NMSs in the same administrative domain.
community name —See community string.
community string —Text string that acts as a password and is used to authenticate messages sent between a managed station and a router containing
an SNMP agent. The community string is sent in every packet between the manager and the client. Also called a community name.
IETF —Internet Engineering Task Force. Task force consisting of over 80 working groups responsible for developing Internet standards.
The IETF operates under the auspices of ISOC.
See also ISOC.
informs —A type of notification message that is more reliable than a conventional trap notification message, because the informs message
notification requires acknowledgment, and a trap notification does not.
ISOC —Internet Society. International nonprofit organization, founded in 1992, that coordinates the evolution and use of the Internet.
In addition, ISOC delegates authority to other groups related to the Internet, such as the IAB. ISOC is headquartered in Reston,
Virginia (United States).
label —A short, fixed-length data construct that tells switching nodes how to forward data (packets or cells).
label distribution protocol —See LDP.
label forwarding information base —See LFIB.
label switch router —See LSR.
—label distribution protocol. A standard protocol between MPLS-enabled routers that is used for the negotiation of the labels
(addresses) used to forward packets.
—label forwarding information base. In the Cisco Label Switching system, the data structure for storing information about
incoming and outgoing tags (labels) and associated equivalent packets suitable for labeling.
—label switch router. A device that forwards MPLS packets based on the value of a fixed-length label encapsulated in each
—Management Information Base. Database of network management information that is used and maintained by a network management
protocol such as SNMP or CMIP. The value of a MIB object can be changed or retrieved using SNMP or CMIP commands, usually
through a GUI network management system. MIB objects are organized in a tree structure that includes public (standard) and
private (proprietary) branches.
—Multiprotocol Label Switching. A method for forwarding packets (frames) through a network. It enables routers at the edge
of a network to apply labels to packets (frames). ATM switches or existing routers in the network core can switch packets
according to the labels with minimal lookup overhead.
MPLS interface —An interface on which MPLS traffic is enabled.
MPLS VPN —Multiprotocol Label Switching Virtual Private Network. Using MPLS VPNs in a Cisco network provide the capability to deploy
and administer scalable Layer 3 VPN backbone services including applications, data hosting network commerce, and telephony
services, to business customers. A VPN is a secure IP-based network that shares resources on one or more physical networks.
A VPN contains geographically dispersed sites that can communicate securely over a shared backbone.
For an MPLS VPN Solution, an MPLS VPN is a set of PEs that are connected by means of a common “backbone” network to supply
private IP interconnectivity between two or more customer sites for a given customer. Each VPN has a set of provisioning templates
and policies and can span multiple provider administrative domains (PADs).
Multiprotocol label Switching —See MPLS.
—A message sent by an SNMP agent to a network management station, console, or terminal to indicate that a significant event
within Cisco software has occurred.
See also trap.
—network management system. A powerful, well-equipped computer (typically an engineering workstation) that is used by a network
administrator to communicate with other devices in the network. An NMS is typically used to manage network resources, gather
statistics, and perform a variety of network administration and configuration tasks.
PE device —provider edge router. A router on the border between a VPN provider and a VPN customer that belongs to the provider.
—Provider-Provisioned VPN. The name of the IETF working group that is developing the PPVPN-MPLS-VPN MIB (MPLS-VPN-MIB).
—quality of service. Measure of performance for a transmission system that reflects its transmission quality and service availability.
—Resource Reservation Protocol. Protocol for reserving network resources to provide Quality of Service guarantees to application
Simple Network Management Protocol —See SNMP.
—Simple Network Management Protocol. Network management protocol used almost exclusively in TCP/IP networks. SNMP provides
a means to monitor and control network devices, and to manage configurations, statistics collection, performance, and security.
—SNMP Version 2. Version 2 of the popular network management protocol. SNMP2 supports centralized as well as distributed network
management strategies, and includes improvements in the SMI, protocol operations, management architecture, and security.
See also SNMP.
traffic engineering —The techniques and processes used to cause routed traffic to travel through the network on a path other than the one that
would have been chosen if standard routing methods had been used.
—A message sent by an SNMP agent to a network management station, console, or terminal, indicating that a significant event
occurred. Traps (notifications) are less reliable than inform requests, because the receiver does not send an acknowledgment
when it receives a trap. The sender cannot determine if the trap was received.
See also notification.
—Virtual Private Network. A group of sites that, as the result of a set of administrative policies, are able to communicate
with each other over a shared backbone network.
See MPLS VPN.
—VPN routing/forwarding instance. A VRF consists of an IP routing table, a derived forwarding table, a set of interfaces that
use the forwarding table, and a set of rules and routing protocols that determine what goes into the forwarding table. In
general, a VRF includes the routing information that defines a customer VPN site that is attached to a PE device.