Alcatel-Lucent 7750 SR - Detailed PBB Emulated LAG Solution Description; Figure 111: Ethernet Tunnel Overlay

PBB Features
Page 790 7750 SR OS Services Guide
In Figure 110, the G.8031 Ethernet tunnels are used by the B-SAP(s) mapped to the green BVPLS
entities supporting the ELINE services. A LAG-like loadsharing solution is provided for the
Multipoint BVPLS (white circles) supporting the ELAN (IVPLS) services. The green G.8031
tunnels co-exist with LAG-emulating Ethernet tunnels (loadsharing mode) on both BEB-BCB and
BCB-BCB physical links.
The G.8031-controlled Ethernet tunnels will select an active tunnel based on G.8031 APS
operation, while emulated-LAG Ethernet tunnels will hash traffic within the configured links.
Upon failure of one of the links the emulated-LAG tunnels will rehash traffic within the remaining
links and fail the tunnel once the number of links breaches the minimum required (independent of
G.8031-controlled Ethernet tunnels on the links shared emulated-LAG).
Detailed PBB Emulated LAG Solution Description
This section discusses the details of the emulated LAG Ethernet tunnels for PBB. The main
solution components are depicted in Figure 111 which overlays Ethernet Tunnels services on the
network from Figure 109.
Figure 111: Ethernet Tunnel Overlay
C-MAC - 1 C-MAC - 2
BCB – E BCB – F
BEB1
BEB2
3/1/1
2/1/1
4/1/1
1/1/1
Eth-tunnel 1
Eth-tunnel 3
BVPLS using P-MSTP
Load sharing
IVPLS
Eth-tunnel
E-Pipe
C-MAC - 1 C-MAC - 2
BCB – E BCB – F
BEB1
BEB2
3/1/1
2/1/1
4/1/1
1/1/1
Eth-tunnel 1
Eth-tunnel 3
BVPLS using P-MSTP
Load sharing
IVPLS
Eth-tunnel
E-Pipe