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Definitions and Acronyms
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•
Note
The MPLS/VPN solution supports the existence of non-VPN-based subscribers concurrently with the
MPLS/VPN-based subscribers (see
Definitions and Acronyms
Table 13-1
Table 13-1
Term or Acronym
PE (Provider Edge router)
P (Provider router)
VPN (Virtual Private Network)
BGP LEG
Upstream
Downstream
RD (Route Distinguisher)
RT (Route Target)
VRF (Virtual Routing and
Forwarding instance)
Cisco SCE 2000 and SCE 1000 Software Configuration Guide
13-2
There are two levels of MPLS labels.
External labels — Used for transport over the service provider MPLS core network.
–
These labels are not mandatory for VPN classification, and some situations do not appear in the
packet due to PHP or other reasons.
Internal labels (BGP labels) — Used to identify the VPNs connected to each edge router, and
–
typically controlled by the BGP protocol.
These labels are mandatory for VPN classification.
The MPLS/VPN solution contains the SCE platform and the SM. The SM acts as a BGP peer for the
PE routers in the service provider network, and communicates the BGP information to the SCE
platform as subscriber information.
defines important terms and acronyms.
MPLS/VPN Terms and Acronyms
Non-VPN-Based Subscribers, page
Definition
A router at the edge of the service provider network. The PE routers
are the ones that connect to the customers, and maintain the VPNs
A router in the core of the service provider network. P routers only
forward MPLS packets, regardless of VPNs.
In the Service Control context, a VPN is the part of the VPN that
resides in a specific site. It is a managed entity over which private
IP subscribers can be managed.
A software module that resides on the SM server and generates
BGP-related login events. The BGP LEG communicates with the
BGP routers (PEs) and passes the relevant updates to the SM
software, which generates login events to the SCE platform for the
updated VPN-based subscribers.
Traffic coming from the PE router and going into the P router
Traffic coming from the P router and going into the PE router
Used to uniquely identify the same network/mask from different
VRFs (such as, 10.0.0.0/8 from VPN A and 10.0.0.0/8 from VPN B)
Used by the routing protocols to control import and export policies,
to build arbitrary VPN topologies for customers
Mechanism used to build per-interface routing tables. Each PE has
several VRFs, one for each site it connects to. This is how the
private IPs remain unique.
Chapter 13
MPLS/VPN Support
13-6).
OL-7827-12
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