VPRN Features
Page 874 7750 SR OS Services Guide
Spoke SDPs
Distributed services use service distribution points (SDPs) to direct traffic to another SR-Series
router via service tunnels. SDPs are created on each participating SR-Series and then bound to a
specific service. SDP can be created as either GRE or MPLS. Refer to Service Distribution Points
(SDPs) on page 41 for information about configuring SDPs.
This feature provides the ability to cross-connect traffic entering on a spoke SDP, used for Layer 2
services (VLLs or VPLS), on to an IES or VPRN service. From a logical point of view, the spoke
SDP entering on a network port is cross-connected to the Layer 3 service as if it entered by a
service SAP. The main exception to this is traffic entering the Layer 3 service by a spoke SDP is
handled with network QoS policies not access QoS policies.
Figure 54 depicts traffic terminating on a specific IES or VPRN service that is identified by the
sdp-id and VC label present in the the service packet.
Figure 3: SDP-ID and VC Label Service Identifiers
IES
SDP
IES
IES
SAP
SAP
Access Network
VPRN
VRF
VC:Y
VC:X
Base
Router
Instance
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