Spoke Sdp Redundancy Into Ies/Vprn; Figure 132: Active/Standby Vrf Using Resilient L2 Circuits - Alcatel-Lucent 7750 SR Manual

Spoke SDP termination on an IES or VPRN 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 had entered using a service SAP. The main exception to this is traffic entering the
Layer 3 service using a spoke SDP is handled with network QoS policies instead of access QoS
policies.
When a SAP Down or SDP binding down status message is received by the 7750 PE in which the
ipipe or Ethernet spoke-sdp is terminated on an IES or VPRN interface, the interface is brought
down and all associated routes are withdrawn in a similar way when the spoke-sdp goes down
locally. The same actions are taken when the standby T-LDP status message is received by the
7750 IES/VPRN PE.
This feature can be used to provide redundant connectivity to a VPRN or IES from a PE providing
a VLL service, as shown in
ATM, FR, Ethernet
CE1

Spoke SDP Redundancy into IES/VPRN

This feature can be used to provide redundant connectivity to a VPRN or IES from a PE providing
a VLL service, as shown in
In Figure
chooses to forward traffic on one of the spoke SDPs (the active spoke-SDP), while blocking traffic
on the other spoke-SDP (the standby spoke-SDP) in the transmit direction. PE2 and PE3 take any
spoke-SDPs for which PW forwarding standby has been signaled by PE1 to an operationally down
state.
7750 SR OS Services Guide
Figure
A
or PPP
S
PE1

Figure 132: Active/Standby VRF Using Resilient L2 Circuits

Figure
132, PE1 terminates two spoke-SDPs that are bound to one SAP connected to CE1. PE1
Virtual Private Routed Network Services
132.
VRF /
IEB
A
PE2
PW1 (Active)
ipipe or epipe PWs
PW2 (Standby)
VRF /
IP/MPLS
A
IEB
PE3
132, using either epipe or ipipe spoke-SDPs.
VPRN
OSSG407
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