Descripción del producto
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Figure 2-8: IGMP Packets Processing/Forwarding Diagram
The Multicast IPTV traffic is controlled via the IGMP Protocol. In the several parts that make the GPON Access Network there are several modules
performing their tasks in order to reduce traffic replication and bandwidth waste through the network. So each of the components perform the
following tasks:
The Host generates the Joins/Leaves according to the streams it wants to receive and plays the IP Multicast Streams;
The ONT makes IGMP Snooping in order to transport from the Multicast GEM Port to the host, only the streams it wants to
receive;
The GPON Line card acts like an IGMP Proxy, receiving the requests from the hosts, and checking if it is already receiving or
not the IP Multicast Streams from the network, sending to the Switch Fabric card the first Join message to ask for the stream
and the last Leave message to stop receiving the stream from the upstream. It also answers to the IGMP Queries generated
by the Switch Fabric card. It inserts the Multicast Streams in the Multicast GEM Port of the GPON interface where there are
clients pretending to receive those Streams; In order to check if the hosts are still watching the channels and they didn’t
disconnect without advising (send a leave) General Queries are periodical generated towards the hosts;
The Switch Fabric card acts like an IGMP Proxy, receiving the requests from the line cards, and checking if it is already
receiving or not the IP Multicast Streams from the network, sending to the Uplink Ports the first Join message to request that
stream and the last Leave message to stop receiving the stream. It also answers to the IGMP Queries received on the Uplink
Ports. In order to check if the line cards are still watching the channels and they didn’t disconnect without advising (send a
leave) General Queries are periodical generated towards the line cards.
2.8.3 Authentication: DHCP Relay
The OLT can act like a DHCP Relay Agent for DHCPv4 (RFC 3046) & v6 (RFC 6221) inserting client information (circuit id and remote id) in the DHCP
packets. This information is required by authentication platform to assign IP addresses to the clients.
Circuit-id is an automatic string generated by the OLT; the user can choose the syntax he pretends to use.
Remote-id is a string which is user configured at the time the service is provisioned to the customer.
Содержание OLT 769401
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