для Cisco Cisco IOS Software Release 12.0(22)S
MPLS Egress NetFlow Accounting
Glossary
25
Cisco IOS Releases 12.0(10)ST, 12.1(5)T, and 12.0(22)S
Glossary
BGP—Border Gateway Protocol. An interdomain routing protocol that replaces Exterior Border
Gateway Protocol (EGP). BGP exchanges reachability information with other BGP systems. It is
defined by RFC 1163.
Gateway Protocol (EGP). BGP exchanges reachability information with other BGP systems. It is
defined by RFC 1163.
Border Gateway Protocol—See BGP.
BGP/MPLS/VPN—A VPN solution that uses MPLS and BGP protocol to allow multiple remote
customer sites to be connected over an IP backbone. Refer to RFC 2547 for details.
customer sites to be connected over an IP backbone. Refer to RFC 2547 for details.
CE router—A customer edge router. A router that is part of a customer network and interfaces to a PE
router.
router.
customer network—A network that is under the control of an end customer. A customer network can
use private addresses as defined in RFC 1918. Customer networks are logically isolated from each other
and from the provider network. A customer network is also known as a C network.
use private addresses as defined in RFC 1918. Customer networks are logically isolated from each other
and from the provider network. A customer network is also known as a C network.
egress PE—The provider edge router through which traffic moves from the backbone to the destination
VPN site.
VPN site.
flow—A set of packets with the same source IP address, destination IP address, source/destination
ports, and type-of-service, and the same interface on which flow is monitored. Ingress flows are
associated with the input interface, and egress flows are associated with the output interface.
ports, and type-of-service, and the same interface on which flow is monitored. Ingress flows are
associated with the input interface, and egress flows are associated with the output interface.
ingress PE—The provider edge router through which traffic enters the backbone (provider network)
from a VPN site.
from a VPN site.
label—A short, fixed length identifier that tells switching nodes how the data (packets or cells) should
be forwarded.
be forwarded.
MPLS—Multiprotocol label switching. An emerging industry standard on which label switching is
based.
based.
multiprotocol label switching—See MPLS.
open shortest path first—See OSPF.
OSPF—Open Shortest Path First. A link-state, hierarchical Interior Gateway Protocol (IGP) routing
algorithm proposed as a successor to RIP in the Internet community. OSPF features include least-cost
routing, multipath routing, and load balancing.
algorithm proposed as a successor to RIP in the Internet community. OSPF features include least-cost
routing, multipath routing, and load balancing.
PE router—A provider edge router. A router at the edge of a provider network that interfaces to CE
routers.
routers.
provider network—A backbone network that is under the control of a service provider and provides
transport among customer sites. A provider network is also known as the P network.
transport among customer sites. A provider network is also known as the P network.
virtual private network—See VPN.
VPN—Virtual private network. A network that enables IP traffic to use tunneling to travel securely over
a public TCP/IP network.
a public TCP/IP network.
VRF—VPN routing and forwarding instance. The VRF is a key element in the MPLS VPN technology.
VRFs exist on PEs only. A VRF is populated with VPN routes and allows multiple routing tables in a
PE. One VRF is required per VPN on each PE in the VPN.
VRFs exist on PEs only. A VRF is populated with VPN routes and allows multiple routing tables in a
PE. One VRF is required per VPN on each PE in the VPN.