Using Q-in-Q-in-Q to implement ethernet service unit ring
View Patent ↗A second VLAN tag is prepended to a packet prepended with a first VLAN tag when the packet is forwarded from a first port to a second port to result in an Q-in-Q packet. The second port has output connected to input of a third port. A third VLAN tag is prepended to the Q-in-Q packet when the Q-in-Q packet is forwarded from the third port to a fourth port to result in an Q-in-Q-in-Q packet. In another embodiment, a third VLAN tag is stripped from a Q-in-Q-in-Q packet prepended with first, second, and third VLAN tags to result in a Q-in-Q packet when the Q-in-Q-in-Q packet is forwarded from a first port to a second port. The second port has output connected to input of a third port. The second VLAN tag is stripped from the Q-in-Q packet.
1. A method comprising:
prepending a second virtual local area network (VLAN) tag to a packet prepended with a first VLAN tag when the packet is forwarded from a first port to a second port to result in an Qin-Q packet, the second port having output connected to input of a third port; and
prepending a third VLAN tag to the Q-in-Q packet when the Q-in-Q packet is forwarded from the third port to a fourth port to result in an Q-in-Q-in-Q packet, wherein the third VLAN tag includes an operation code (opcode) field to contain an opcode and an equipment identifier field to contain an equipment identifier and wherein the third VLAN tag further includes a tag protocol field, a priority field, and a canonical format indicator field.
2. The method of claim 1 wherein the packet is an ingress packet from an Ethernet service unit (ESU) to an Ethernet routing switch (ERS).
3. The method of claim 1 wherein the second VLAN tag includes a port identifier field to contain a port identifier.
4. The method of claim 1 wherein the second VLAN tag further includes a tag protocol field, a priority field, and a canonical format indicator field.
5. The method of claim 1 wherein said equipment identifier specifies a particular Ethernet Service Unit (ESU) implementing an Ethernet Service Unit ring.
6. A method comprising:
stripping a third virtual local area network (VLAN) tag from a Q-in-Q-in-Q packet prepended with first, second, and third VLAN tags to result in a Q-in-Q packet when the Q-in-Qin-Q packet is forwarded from a first port to a second port, the second port having output connected to input of a third port; and
stripping the second VLAN tag from the Q-in-Q packet when the Q-in-Q packet is forwarded from the third port to a fourth port, wherein the third VLAN tag includes an operation code (opcode) field to contain an opcode and an equipment identifier field to contain an equipment identifier and wherein the third VLAN tag further includes a tag protocol field, a priority field, and a canonical format indicator field.
7. The method of claim 6 wherein the Q-in-Q-in-Q packet is an egress packet from an Ethernet routing switch (ERS) to an Ethernet service unit (ESU).
8. The method of claim 6 wherein the second VLAN tag includes a port identifier field to contain a port identifier.
9. The method of claim 6 wherein the second VLAN tag further includes a tag protocol field, a priority field, and a canonical format indicator field.
10. An article of manufacture comprising:
a non-transitory machine-accessible storage medium including information that, when accessed by a machine, cause the machine to perform operations comprising:
prepending a second virtual local area network (VLAN) tag to a packet prepended with a first VLAN tag when the packet is forwarded from a first port to a second port to result in an Qin-Q packet, the second port having output connected to input of a third port; and
prepending a third VLAN tag to the Q-in-Q packet when the Q-in-Q packet is forwarded from the third port to a fourth port to result in an Q-in-Q-in-Q packet, wherein the third VLAN tag includes an operation code (opcode) field to contain an opcode and an equipment identifier field to contain an equipment identifier and wherein the third VLAN tag further includes a tag protocol field, a priority field, and a canonical format indicator field.
11. The article of manufacture of claim 10 wherein the packet is an ingress packet from an Ethernet service unit (ESU) to an Ethernet routing switch (ERS).
12. The article of manufacture of claim 10 wherein the second VLAN tag includes a port identifier field to contain a port identifier.
13. The article of manufacture of claim 10 wherein the second VLAN tag further includes a tag protocol field, a priority field, and a canonical format indicator field.
14. The article of manufacture of claim 10 wherein said equipment identifier specifies a particular Ethernet Service Unit (ESU) implementing an Ethernet Service Unit ring.
15. An article of manufacture comprising:
a non-transitory machine-accessible storage medium including information that, when accessed by a machine, cause the machine to perform operations comprising:
stripping a third virtual local area network (VLAN) tag from a Q-in-Q-in-Q packet prepended with first, second, and the third virtual VLAN tags to result in a Q-in-Q packet when the Q-in-Q-in-Q packet is forwarded from a first port to a second port, the second port having output connected to input of a third port; and
stripping the second VLAN tag from the Q-in-Q packet when the Q-in-Q packet is forwarded from the third port to a fourth port, wherein the third VLAN tag includes an operation code (opcode) field to contain an opcode and an equipment identifier field to contain an equipment identifier and wherein the third VLAN tag further includes a tag protocol field, a priority field, and a canonical format indicator field.
16. The article of manufacture of claim 15 wherein the Q-in-Q-in-Q packet is an egress packet from an Ethernet routing switch (ERS) to an Ethernet service unit (ESU).
17. The article of manufacture of claim 15 wherein the second VLAN tag includes a port identifier field to contain a port identifier.
18. The article of manufacture of claim 15 wherein the second VLAN tag further includes a tag protocol field, a priority field, and a canonical format indicator field.
19. An apparatus comprising:
a first prepender to prepend a second virtual local area network (VLAN) tag to a packet prepended with a first VLAN tag when the packet is forwarded from a first port to a second port to result in an Q-in-Q packet, the second port having output connected to input of a third port; and
a second prepender to prepend a third VLAN tag to the Q-in-Q packet when the Q-in-Q packet is forwarded from the third port to a fourth port to result in an Q-in-Q-in-Q packet, wherein the third VLAN tag includes an operation code (opcode) field to contain an opcode and an equipment identifier field to contain an equipment identifier and wherein the third VLAN tag further includes a tag protocol field, a priority field, and a canonical format indicator field.
20. The apparatus of claim 19 wherein the packet is an ingress packet from an Ethernet service unit (ESU) to an Ethernet routing switch (ERS).
21. The apparatus of claim 19 wherein the second VLAN tag includes a port identifier field to contain a port identifier.
22. The apparatus of claim 19 wherein the second VLAN tag further includes a tag protocol field, a priority field, and a canonical format indicator field.
23. The apparatus of claim 19 wherein said equipment identifier specifies a particular Ethernet Service Unit (ESU) implementing an Ethernet Service Unit ring.
24. An apparatus comprising:
a first stripper to strip a third virtual local area network (VLAN) tag from a Q-in-Q-in-Q packet prepended with first, second, and third VLAN tags to result in a Q-in-Q packet when the Q-in-Q-in-Q packet is forwarded from a first port to a second port, the second port having output connected to input of a third port; and
a second stripper to strip the second VLAN tag from the Q-in-Q packet when the Q-in-Q packet is forwarded from the third port to a fourth port, wherein the third VLAN tag includes an operation code (opcode) field to contain an opcode and an equipment identifier field to contain an equipment identifier and wherein the third VLAN tag further includes a tag protocol field, a priority field, and a canonical format indicator field.
25. The apparatus of claim 24 wherein the Q-in-Q-in-Q packet is an egress packet from an Ethernet routing switch (ERS) to an Ethernet service unit (ESU).
26. The apparatus of claim 24 wherein the second VLAN tag includes a port identifier field to contain a port identifier.
27. The apparatus of claim 24 wherein the second VLAN tag further includes a tag protocol field, a priority field, and a canonical format indicator field.
28. A system comprising:
an Ethernet routing switch (ERS) to route packets, the packets including a Q-in-Q-in-Q packet having prepended with first, second, and third virtual local area network (VLAN) tags; and
a plurality of Ethernet service units (ESUs) coupled to the ERS to receive and transmit the packets, at least one of the plurality of the ESU s having a Q-in-Q-in-Q processing module, the Q-in-Q-in-Q processing module comprising:
a prepending module to prepend the second and third VLAN tags to a packet prepended with the first VLAN tag to result in the Q-in-Q-in-Q packet to forward to the ERS, and
a stripping module to strip the second and third VLAN tags from the Q-in-Q-in-Q packet received from the ERS, wherein the third VLAN tag includes an operation code (opcode) field to contain an opcode and an equipment identifier field to contain an equipment identifier and wherein the third VLAN tag further includes a tag protocol field, a priority field, and a canonical format indicator field.
29. The system of claim 28 wherein the prep ending module comprises:
a first prepender to prepend the second VLAN tag to the packet when the packet is forwarded from a first port to a second port to result in an Q-in-Q packet, the second port having output connected to input of a third port; and
a second prepender to prepend the third VLAN tag to the Q-in-Q packet when the Q-in-Q packet is forwarded from the third port to a fourth port to result in the Q-in-Q-in-Q packet.
30. The system of claim 28 wherein the stripping module comprises:
a first stripper to strip the third VLAN tag from the Q-in-Q-in-Q packet to result in a Qin-Q packet when the Q-in-Q-in-Q packet is forwarded from a first port to a second port, the second port having output connected to input of a third port; and
a second stripper to strip the second VLAN tag from the Q-in-Q packet when the Q-in-Q packet is forwarded from the third port to a fourth port.
31. The system of claim 28 wherein the Q-in-Q-in-Q packet is an ingress packet from the ESU to the ERS.
32. The system of claim 28 wherein the Q-in-Q-in-Q packet is an egress packet from the ERS to the ESU.
33. The system of claim 28 wherein the second VLAN tag includes a tag protocol field, a priority field, and a canonical format indicator field.