Services Overview
7705 SAR OS Services Guide Page 37
IES provides IP connectivity between customer access points. From the customer’s
perspective, IES provides direct IP connectivity. The customer is assigned an IP interface
and a SAP designates the customer access point (where the customer IP device is connected)
— one SAP binding per IP interface. Supported SAP encapsulations are MC-MLPPP,
PPP/MLPPP and null/dot1q Ethernet. SDP binding is not required because traffic is routed
rather than being encapsulated in a tunnel.
A Virtual Private Routed Network (VPRN) consists of a set of customer sites connected to
one or more PE routers. VPRNs are based on RFC 2547bis, which details a method of
distributing routing information and forwarding data to provide a Layer 3 Virtual Private
Network (VPN) service to end customers. VPRN traffic is transported over LDP and
RSVP-TE tunnels, as well as static LSPs.
Service Types
Services are commonly called customer or subscriber services. The 7705 SAR offers the
following types of services, which are described in more detail in the referenced chapters:
• Virtual Leased Line (VLL) services
→ ATM VLL (Apipe) — a pseudowire emulation edge-to-edge (PWE3) ATM
service over MPLS, GRE, or IP tunnels on 7705 SAR nodes. See ATM VLL
(Apipe) Services on page 137.
→ Circuit emulation VLL (Cpipe) — a PWE3 circuit emulation service over
MPLS or GRE tunnels on 7705 SAR nodes. See Circuit Emulation VLL (Cpipe)
Services on page 140.
→ Ethernet VLL (Epipe) — a PWE3 Ethernet service over MPLS or GRE tunnels
for Ethernet frames on 7705 SAR nodes. See Ethernet VLL (Epipe) Services on
page 159.
→ IP interworking VLL (Ipipe) — a PWE3 IP service between two hosts
connected by any combination of point-to-point access circuits (PPP/MLPPP)
with routed IPv4 encapsulation and Ethernet interface SAPs; for example,
Ethernet SAP to Ethernet SAP, PPP SAP to MLPPP SAP, or Ethernet SAP to
MLPPP SAP. See IP Interworking VLL (Ipipe) Services on page 168.
• Internet Enhanced Service (IES)
→ IES is used both as a direct Internet access service where the customer is
assigned an IP interface for routed connectivity and for in-band management of
the 7705 SAR. See Internet Enhanced Service on page 329.
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