Architecture for bridged Ethernet residential access networks
View Patent ↗The present invention is related to a method to forward an Ethernet packet in an Ethernet based access network. It comprises the step of receiving the Ethernet packet at a network access node being part of the access network and further the step of transforming at the network access node a first Ethernet MAC address contained in the Ethernet packet into a second Ethernet MAC address. Either the first or the second Ethernet MAC address comprises subscriber or subscriber line identification. Subsequently the step of continuing the communication protocol is performed.
1. A method of forwarding an Ethernet packet in an Ethernet based access network, comprising:
the step of receiving said Ethernet packet at a network access node being part of said access network, characterised in that it further comprises the step of transforming at said network access node a first Ethernet MAC address contained in said Ethernet packet into a second Ethernet MAC address, whereby either said first or said second Ethernet MAC address comprises subscriber line identification and subsequently the step of continuing a communication protocol;
whereby either said first or said second Ethernet MAC address comprising subscriber line identification also contains a netmask comprising a netmask length, said netmask splitting said either first or second Ethernet MAC address in a network related part and a device related part.
2. The method according to claim 1 , characterised in that said Ethernet MAC address comprising subscriber line identification has a format comprising:
a user device identification, being an Ethernet device number of the device on a bus,
a subscriber line identification, being a line number of the bus at a remote unit,
a remote unit identification, being a remote number of said remote unit itself,
a metro edge identification, being a hub number of an aggregation node.
3. The method according to claim 1 or 2 , characterised in that said subscriber line identification allows to retrieve information regarding an origin of said Ethernet packet.
4. The method according to claim 2 , characterised in that said first Ethernet MAC address is an Ethernet source MAC address of an upstream Ethernet frame to be transformed into said second Ethernet MAC address comprising subscriber line identification.
5. The method according to claim 2 , characterised in that said first Ethernet MAC address comprises subscriber line identification to be transformed into said Ethernet MAC address, said second Ethernet MAC address being an Ethernet unicast destination MAC address of a downstream Ethernet frame.
6. The method according to claim 1 , characterised in that said network access node is a remote unit or an aggregation node.
7. Method to forward an Ethernet packet in an Ethernet based access network, comprising:
the step of receiving said Ethernet packet at a network access node being part of said access network, characterised in that it further comprises the step of transforming at said network access node a first Ethernet MAC address contained in said Ethernet packet into a second Ethernet MAC address, whereby said first Ethernet MAC address is a broadcast Ethernet destination MAC address of an upstream Ethernet frame and said second Ethernet MAC address is a multicast-group address, and
wherein part of said Ethernet packet is 1-to-1 mapped with said multicast address.
8. The method according to claim 7 , wherein said part of said Ethernet packet to be 1-to-1 mapped with said multicast address, comprises protocol information.
9. The method according to claim 7 , wherein the step of transforming is replaced by step of encapsulating said Ethernet packet with said first Ethernet MAC address in a new packet comprising said second Ethernet MAC address.
10. The method according to claim 7 , wherein the step of transforming is replaced by a step of applying a MAC address translation, wherein said first Ethernet MAC address is overwritten with said second Ethernet MAC address.
11. An electrical circuit device arranged to carry out the method of claim 7 .
12. A network access node arranged for receiving an Ethernet packet in an Ethernet based access network characterised in that said network access node is further arranged for transforming a first Ethernet MAC address contained in said Ethernet packet into a second Ethernet MAC address, whereby either said first or said second Ethernet MAC address comprises subscriber line identification,
wherein the subscriber line identification comprises a line number of a bus at a remote unit, and
wherein one of said first Ethernet MAC address and said second Ethernet MAC address is split into a network related part and a device related part.
13. A method of transforming a first 48 bit Ethernet MAC address into a second 48 bit Ethernet MAC address format, characterised in that the first 48 bit Ethernet MAC address or the second Ethernet MAC address comprises the following parts:
a fixed two bit part,
a user device identification, being an Ethernet device number of the device on a bus,
a subscriber line identification, being a line number of the bus at a remote unit,
a remote unit identification, being a remote number of said remote unit itself,
a metro edge identification, being a hub number of an aggregation node,
a part that is used to indicate a netmask and its length;
wherein the transforming transforms a source address of an upstream Ethernet packet; and
transmitting the upstream Ethernet packet.
14. The method of claim 13 , characterised in that said metro edge identification starts with a zero bit, indicating an access node.
15. The method of claim 14 , characterised in that said metro edge identification starts with a one bit, indicating an edge node.
16. A method of transforming a first Ethernet packet into a second Ethernet packet characterised in that the first or the second Ethernet packet comprising a MAC address in the following format:
a fixed two bit part,
a user device identification, being an Ethernet device number of the device on a bus,
a subscriber line identification, being a line number of the bus at a remote unit,
a remote unit identification, being a remote number of said remote unit itself,
a metro edge identification, being a hub number of an aggregation node,
a part that is used to indicate a netmask and its length;
wherein the transforming transforms a source address of an upstream Ethernet packet; and
transmitting the upstream Ethernet packet.
17. A method of transforming a first 48 bit Ethernet MAC address into a second 48 bit Ethernet MAC address format, characterised in that the first 48 bit Ethernet MAC address or the second Ethernet MAC address comprises the following parts:
a fixed two bit part,
a user device identification, being an Ethernet device number of the device on a bus,
a subscriber line identification, being a line number of the bus at a remote unit,
a remote unit identification, being a remote number of said remote unit itself,
a metro edge identification, being a hub number of an aggregation node,
a part that is used to indicate a netmask and its length;
wherein the transforming transforms a destination address of a downstream Ethernet packet; and
transmitting the downstream Ethernet packet.
18. A method of transforming a first Ethernet packet into a second Ethernet packet characterised in that the first or the second Ethernet packet comprising a MAC address in the following format:
a fixed two bit part,
a user device identification, being an Ethernet device number of the device on a bus;
a subscriber line identification, being a line number of the bus at a remote unit,
a remote unit identification, being a remote number of said remote unit itself,
a metro edge identification, being a hub number of an aggregation node,
a part that is used to indicate a netmask and its length;
wherein the transforming transforms a destination address of a downstream Ethernet packet; and
transmitting the downstream Ethernet packet.