ZyXEL NetAtlas User Guide - Page 266
Table 133
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Chapter 19 EPON Profile Configuration Table 133 Traffic Bridging Types BRIDGING TYPE UPSTREAM DOWNSTREAM Priority Shared VLAN This divides the PON interface into multiple multicast domains. The links in this mode and having the same VLAN tag belong to the same multicast group. The OLT adds a network VLAN tag and forwards a upstream frame whether it has a VLAN tag or not. The OLT also learns the source MAC address of the upstream frames. The OLT removes the network VLAN tag from the downstream frames before forwarding them to the corresponding links based on the VLAN IDs, priority values and destination address. If the downstream frame's destination address is not found in the MAC table, the OLT broadcasts it to any link in the same multicast group. The OLT drops downstream frames that do not have a VLAN ID. Transparent Priority Shared VLAN This divides the PON interface into multiple multicast domains. The links in this mode and having the same VLAN tag belong to the same multicast group. The OLT adds a network VLAN tag and forwards a upstream frame whether it has a VLAN tag or not. The OLT also learns the source MAC address of the upstream frames. The OLT forwards the downstream frames to the corresponding links based on the VLAN IDs, priority values and destination address. If the downstream frame's destination address is not found in the MAC table, the OLT broadcasts it to any link in the same multicast group. The OLT drops downstream frames that do not have a VLAN ID. Priority Simple Bridged In this mode, only unicast traffic is prioritized. The OLT forwards all incoming traffic and learns the source address of the upstream unicast traffic. If a frame's destination MAC address is found in the MAC table, the OLT forwards the frame to a link based on its priority values. The OLT drops the frames with the matched MAC addresses when the priority values in the frames are out of the specified range. If a frame's destination MAC address is not found in the MAC table, the OLT broadcast it. Downstream frames with the VLAN tags will be discarded. Priority Copy Single VLAN This mode has the same behavior as the Dedicated Single VLAN mode. In this mode, the OLT can also use the priority copy function to change the priority value in the VLAN tag or IP header according to the predefined priority mapping table. See Section 18.1 on page 239 for more information. Priority Copy Double VLAN This mode has the same behavior as the Dedicated Double VLAN mode. In this mode, the OLT can also use the priority copy function to change the priority value in the VLAN tag or IP header according to the predefined priority mapping table. See Section 18.1 on page 239 for more information. 266 NetAtlas EPON Manager User's Guide