Virtual Leased Line Services
7750 SR OS Services Guide Page 233
VLL Using G.8031 Protected Ethernet Tunnels
The use of MPLS tunnels provides a way to scale the core while offering fast failover times using
MPLS FRR. In environments where Ethernet services are deployed using native Ethernet
backbones, Ethernet tunnels are provided to achieve the same fast failover times as in the MPLS
FRR case.
The Alcatel-Lucent VLL implementation offers the capability to use core Ethernet tunnels
compliant with ITU-T G.8031 specification to achieve 50 ms resiliency for backbone failures. This
is required to comply with the stringent SLAs provided by service providers in the current
competitive environment. Epipe and Ipipe services are supported.
When using Ethernet Tunnels, the Ethernet Tunnel logical interface is created first. The Ethernet
tunnel has member ports which are the physical ports supporting the links. The Ethernet tunnel
control SAPs carries G.8031 and 802.1ag control traffic and user data traffic. Ethernet Service
SAPs are configured on the Ethernet tunnel. Optionally when tunnels follow the same paths end
to end services may be configured with, Same-fate Ethernet tunnel SAPs which carry only user
data traffic and shares the fate of the Ethernet tunnel port (if properly configured).
Ethernet tunnels provide a logical interface that VLL SAPs may use just as regular interfaces. The
Ethernet tunnel provides resiliency by providing end to end tunnels. The tunnels are stitched
together by VPLS or Epipe services at intermediate points. Epipes offer a more scalable option.
For further information, see G.8031 Protected Ethernet Tunnels on page 54
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