Alcatel-Lucent 7750 SR Manual page 806

PBB Features
The Epipe information model is expanded to accommodate the configuration of two SAPs (I-
SAPs) and of a BVPLS uplink in the same time. For this configuration to work in an EPIPE
environment, only two of them will be active in the forwarding plane at any point in time,
specifically:
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SAP1 and SAP2 when both MC-LAG links are active on the local BEB1 (see
The Active SAP and the BVPLS uplink if one of the MC-LAG links is inactive on BEB1
→ PBB tunnel will be considered as a backup path only when the SAP is operationally
down.
→ If the SAP is administratively down, then all traffic will be dropped.
Although the CLI allows configuration of two SAPs and a BVPLS uplink in the same
PBB Epipe, the BVPLS uplink is inactive as long as both SAPs are active.
→ Traffic received through PBB tunnel is dropped if BVPLS uplink is inactive.
The same rules apply to BEB2.
7750 SR OS Services Guide
Figure 119)