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How MPLS/VPN Support Works
VPN Detection
The network configuration that provides the division into VPNs is controlled by the SM. The
network-wide value that describes a VPN most closely is either the Route Target or the Route
Distinguisher
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The relevant module in the Subscriber Manager server (SM) is the BGP-LEG. The BGP-LEG is added
to the BGP neighborhood for obtaining the information on the MPLS labels. The local PEs are
configured to add the BGP-LEG as a BGP peer.
The SCE platform detects that a flow belongs to a certain VPN according to the downstream label that
the flow carries, and the MAC address of the PE that it is sent to.
One VPN may spread over more than one PE router, as long as all the sites of the VPN are connected to
the subscriber side of the same SCE platform
VPNs can be configured only via the SM. The SCE platform CLI can be used to view VPN-related
information, but not to configure the VPNs.
Subscriber Detection
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What is an MPLS/VPN-based Subscriber?
As in other modes of operation, in MPLS/VPN each flow belongs to a certain subscriber. A VPN-based
subscriber is a part of a VPN. The VPN itself corresponds to a set of IP addresses that are managed
separately and that belong to a specific ISP customer who pays for the VPN service.
An MPLS/VPN-based subscriber can be defined as either of the following:
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The network configuration that provides the division into VPNs and VPN-based subscribers is controlled
by the SM. (For more information, see the Cisco Service Control Management Suite Subscriber Manager
User Guide )
Cisco SCE 2000 and SCE 1000 Software Configuration Guide
13-4
The administrator configures the SM to detect VPNs, according to selected attribute (RT or RD).
The network operator provides the SCE platform with a mapping between RT values and VPN
subscriber names.
What is an MPLS/VPN-based Subscriber?, page 13-4
Private IP Subscriber Support, page 13-5
A set of IP addresses or ranges in a certain VPN.
All the IP addresses of a CE router, defined by a BGP community over a VPN.
Chapter 13
MPLS/VPN Support
OL-7827-12
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