Virtual Leased Line Services
7750 SR OS Services Guide Page 205
IP Interworking VLL (Ipipe) Services
• IP Interworking VLL (Ipipe) Services on page 205
→ Ipipe VLL on page 205
→ IP Interworking VLL Datapath on page 207
• Basic Configurations on page 241
• Common Configuration Tasks on page 241
→ Configuring VLL Components on page 242
− Creating an Ipipe Service on page 270
• Service Management Tasks on page 285
Ipipe VLL
Ipipe
Figure 42: IP Interworking VLL (Ipipe)
Figure 42 provides an example of IP connectivity between a host attached to a point-to-point
access circuit (FR, ATM, PPP) with routed PDU IPv4 encapsulation and a host attached to an
Ethernet interface. Both hosts appear to be on the same LAN segment. This feature enables service
interworking between different link layer technologies. A typical use of this application is in a
Layer 2 VPN when upgrading a hub site to Ethernet while keeping the spoke sites with their
existing Frame Relay or ATM IPv4 routed encapsulation.
The ATM SAP carries the IPv4 packet using RFC 2684, Multiprotocol Encapsulation over ATM
Adaptation Layer 5
, VC-Mux or LLC/SNAP routed PDU encapsulation. The Frame Relay SAP
makes use of RFC 2427, Multiprotocol Interconnect over Frame Relay, routed PDU encapsulation
IP/MPLS
CE 2 [64.47.30.2/32] CE 1 [64.47.30.1/32]
CE 3 [64.47.31.1/32] CE 4 [64.47.31.2/32]
Ethernet/VLAN
SAP 1/1/1:1000
FR SAP
1/2/1:100
ATM SAP
1/3/1:0/100
Ethernet VLAN
SAP 1/1/1:1001
PE 1
PE 2
SR
SR
IPIPE_001C
IP PW
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