Televes OLT 769401, Руководство пользователя, Страница: 30 / 482

Descripción del producto
30
2.11.1.2 Ethernet Uplink Ports Protection
Configuration of Ethernet Uplink ports protection is a functionality that enables the 1+1 protection of an uplink port with another uplink port.
2.11.1.3 Link Aggregation Control Protocol (LACP)
The Link Aggregation Control Protocol (LACP) provides the system with Aggregation, Protection and Load Balancing features.
The Aggregation consists in a Logical Group of Physical uplink ports that form a Link Aggregation Group (LAG).
Up to 8 uplink ports can be aggregated in the same LAG with the protection mechanisms flexibly configured by the management system.
The Protection is done when one of the LAG ports becomes inactive (Link Down) or there are losses or errors in LACPDU Messages (only in
Dynamic LAG). In this case all the traffic that was going through this port is sent to the other ports that belong to the same LAG.
The Load Balancing can be made according with:
Source MAC;
Destination MAC;
Source and Destination MAC.
2.11.1.4 Ethernet Ring Protection Switching
The OLT allows the implementation of ring protection according to ITU-T G.8032/Y.1344 Ethernet Ring Protection Switching.
Support of “open ring” mode, i.e., access ring is configured as G.8032 sub-ring without R-APS Virtual Channel;
Support of ETH-CC / ETH-RDI Function (CCM), Connectivity Fault Management (CFM) monitoring per VLAN, according to
ITU-T Y.1731 / IEEE 802.1ag;
Support of R-APS Channel.
Up to 256 CFM probes supported.
2.11.1.4.1 PRINCIPLE OF OPERATION
The basic idea is to dedicate a link as Ring protection Link (RPL) that is normally blocked, but will be unblocked when a failure occurs in the ring.
This ensures that there is connectivity among all nodes on the ring without having a loop.
Connectivity Fault Management Messages (CCM) are used to detect link and node failure and
Ring Automatic Protection Switching Messages are used to coordinate the activity on the RPL.
MAC learning is enabled on all nodes and ports except on ports facing the RPL.
In normal operation RPL is blocked.