PBB Features
Page 788 7750 SR OS Services Guide
Detailed Solution Description
This section discusses the details of the Ethernet tunneling for PBB. The main solution
components are depicted in Figure 109.
Figure 109: PBB-Epipe with B-VPLS over Ethernet Tunnel
The PBB ELINE service is represented in the BEBs as a combination of an Epipe mapped to a
BVPLS instance. A eth-tunnel object is used to group two possible paths defined by specifying a
member port and a control tag. In our example, the blue-circle representing the eth-tunnel is
associating in a protection group the two paths instantiated as (port, control-tag/bvid): a primary
one of port 1/1/1, control-tag 100 and respectively a secondary one of port 2/2/2, control tag 200.
The BCBs devices will stitch each BVID between different BEB-BCB links using either a VPLS
or Epipe service. Epipe instances are recommended as the preferred option due to increased tunnel
scalability.
Fast failure detection on the primary and backup paths is provided using IEEE 802.1ag CCMs that
can be configured to transmit at 10 msec interval. Alternatively, the link layer fault detection
mechanisms like LoS/RDI or 802.3ah can be employed.
To Next Page
Loading...
