Services
7750 SR OS Services Guide Page 31
Service Types
The SR-Series offers the following types of subscriber services which are described in more detail
in the referenced chapters:
• Virtual Leased Line (VLL) services:
→ Ethernet pipe (Epipe) — A Layer 2 point-to-point VLL service for Ethernet frames.
See Ethernet Pipe (Epipe) Services on page 195.
→ ATM VLL (Apipe) — A point-to-point ATM service between users connected to
7750 nodes on an IP/MPLS network. See ATM VLL (Apipe) Services on page 180.
→ Frame-Relay (Fpipe) — A point-to-point Frame Relay service between users
connected to 7750 nodes on the IP/MPLS network. See Frame Relay VLL (Fpipe)
Services on page 201.
→ IP Pipe (Ipipe) — Provides IP connectivity between a host attached to a point-to-point
access circuit (FR, ATM, PPP) with routed IPv4 encapsulation and a host attached to
an Ethernet interface. See IP Interworking VLL (Ipipe) Services on page 205.
• Virtual Private LAN Service (VPLS) — A Layer 2 multipoint-to-multipoint VPN. See
Virtual Private LAN Service on page 417. VPLS includes Hierarchical VPLS (H-VPLS)
which is an enhancement of VPLS which extends Martini-style signaled or static virtual
circuit labeling outside the fully meshed VPLS core.
• Internet Enhanced Service (IES) — A direct Internet access service where the customer is
assigned an IP interface for Internet connectivity. See Internet Enhanced Service on page
857.
• Virtual Private Routed Network (VPRN) — A Layer 3 IP multipoint-to-multipoint VPN
service as defined in RFC 2547bis. See Virtual Private Routed Network Service on page
1049.
• Circuit Emulation Service (Cpipe) — Circuits encapsulated in MPLS use circuit pipes
(Cpipes) to connect to the far end circuit. Cpipes support either SAP-Spoke SDP or SAP-
SAP connections.
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