CA2395491A1 - Forward overrides in a packet switch - Google Patents
Forward overrides in a packet switch Download PDFInfo
- Publication number
- CA2395491A1 CA2395491A1 CA002395491A CA2395491A CA2395491A1 CA 2395491 A1 CA2395491 A1 CA 2395491A1 CA 002395491 A CA002395491 A CA 002395491A CA 2395491 A CA2395491 A CA 2395491A CA 2395491 A1 CA2395491 A1 CA 2395491A1
- Authority
- CA
- Canada
- Prior art keywords
- data packet
- received data
- forwarding entry
- switch
- forwarding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/20—Support for services
- H04L49/205—Quality of Service based
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/74—Address processing for routing
- H04L45/745—Address table lookup; Address filtering
- H04L45/7453—Address table lookup; Address filtering using hashing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/30—Peripheral units, e.g. input or output ports
- H04L49/3018—Input queuing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/35—Switches specially adapted for specific applications
- H04L49/351—Switches specially adapted for specific applications for local area network [LAN], e.g. Ethernet switches
Abstract
A memory is successively searched using the contents of a header included in a data packet in order to select a forwarding entry for the data packet. The searches use a header field for a different protocol layer. A next field stored in a forwarding entry is used to determine if another search is required. The data packet is forwarded according to the forwarding override stored in the selected forwarding entry selected from the final successive search. The received data packet is forwarded to a host processor, through the switch, to both the host processor and through the switch, or the received data packet is not forwarded, dependent on the selected forward override.
Claims (41)
1. A switch comprising:
a memory comprising at least one forwarding entry, the forwarding entry including a forward override; and forward override logic which, for a data packet, successively searches, with respect to successive layers, the memory for forwarding entries matching portions of the received data packet and extracts the forward override from a matching forwarding entry.
a memory comprising at least one forwarding entry, the forwarding entry including a forward override; and forward override logic which, for a data packet, successively searches, with respect to successive layers, the memory for forwarding entries matching portions of the received data packet and extracts the forward override from a matching forwarding entry.
2. The switch as claimed in Claim 1 wherein the forwarding entry further comprises a next field and the forward override logic determines whether to perform another search of the memory dependent on the state of the next field in a current forwarding entry.
3. The switch as claimed in Claim 1 wherein the memory is a content addressable memory.
4. The switch as claimed in Claim 1 further comprising:
forward select logic which forwards the received data packet dependent on the extracted forward override corresponding to a final search.
forward select logic which forwards the received data packet dependent on the extracted forward override corresponding to a final search.
5. The switch as claimed in Claim 1 wherein the forwarding entry further comprises a priority field, the priority field including an assigned priority for the received data packet.
6. The switch as claimed in Claim 1 wherein the forwarding entry further comprises:
a host traffic label field, the host traffic label field including classification data for the received data packet.
a host traffic label field, the host traffic label field including classification data for the received data packet.
7. The switch as claimed in Claim 1 wherein the portions of the received data packets identify protocols.
8. A method for selecting a forward override for a received data packet in a switch comprising the steps of:
providing a memory, the memory comprising at least one forwarding entry, the forwarding entry including a forward override;
successively searching, with respect to successive layers, the memory for forwarding entries matching portions of a received data packet; and extracting the forward override from a matching forwarding entry.
providing a memory, the memory comprising at least one forwarding entry, the forwarding entry including a forward override;
successively searching, with respect to successive layers, the memory for forwarding entries matching portions of a received data packet; and extracting the forward override from a matching forwarding entry.
9. The method as claimed in Claim 8 further comprising the step of:
determining whether to perform another search of the memory dependent on the state of a next field in a current forwarding entry.
determining whether to perform another search of the memory dependent on the state of a next field in a current forwarding entry.
10. The method as claimed in Claim wherein the memory is content addressable memory.
11. The method as claimed in Claim 10 wherein the content addressable memory comprises registers.
12. The method as claimed in Claim 8 further comprising the step of:
forwarding the received data packet dependent on the extracted forward override corresponding to a final search.
forwarding the received data packet dependent on the extracted forward override corresponding to a final search.
13. The method as claimed in Claim 8 wherein the forwarding entry further comprises a priority field, the priority field including an assigned priority for the received data packet.
14. The method as claimed in Claim 8 wherein the forwarding entry further comprises a host traffic label field, the host traffic label field including classification data for the received data packet.
15. The method as claimed in Claim 8 wherein the portions of the received data packets identify protocols.
16. A switch comprising:
a memory comprising at least one forwarding entry, the forwarding entry including a forward override;
means for successively searching, with respect to successive layers, the memory for forwarding entries matching portions of a received data packet;
and means for extracting the forward override from a matching forwarding entry.
a memory comprising at least one forwarding entry, the forwarding entry including a forward override;
means for successively searching, with respect to successive layers, the memory for forwarding entries matching portions of a received data packet;
and means for extracting the forward override from a matching forwarding entry.
17. The switch as claimed in Claim 16 further comprising:
means for determining whether to perform another search of the memory dependent on the state of a next field included in the forwarding entry.
means for determining whether to perform another search of the memory dependent on the state of a next field included in the forwarding entry.
18. The switch as claimed in Claim 16 wherein the memory is a content addressable memory.
19. The switch as claimed in Claim 16 further comprising:
means for forwarding the received data packet dependent on the extracted forward override corresponding to a final search.
means for forwarding the received data packet dependent on the extracted forward override corresponding to a final search.
20. The switch as claimed in Claim 16 wherein the forwarding entry further comprises:
a priority field the priority field including an assigned priority for the received data packet.
a priority field the priority field including an assigned priority for the received data packet.
21. The switch as claimed in Claim 16 wherein the forwarding entry further includes a host traffic label field, the host traffic label field including classification data far the received data packet.
22. The switch as claimed in Claim 16 wherein the portions of the received data packets identify protocols.
23. A switch comprising:
a protocol CAM comprising at least one forwarding entry, the forwarding entry including a forward override; and forward override logic which, for a received data packet, successively searches, with respect to successive layers, the protocol CAM for forwarding entries matching portions of the received data packet and extracts the forward override from a matching forwarding entry.
a protocol CAM comprising at least one forwarding entry, the forwarding entry including a forward override; and forward override logic which, for a received data packet, successively searches, with respect to successive layers, the protocol CAM for forwarding entries matching portions of the received data packet and extracts the forward override from a matching forwarding entry.
24. The switch as claimed in Claim 23 wherein the forwarding entry further comprises:
a next field and the forward override logic determines whether to perform another search of the protocol CAM dependent on the state of the next field in a current forwarding entry.
a next field and the forward override logic determines whether to perform another search of the protocol CAM dependent on the state of the next field in a current forwarding entry.
25. The switch as claimed in Claim 23 further comprising:
forward select logic which forwards the received data packet dependent on the extracted forward override corresponding to a final search.
forward select logic which forwards the received data packet dependent on the extracted forward override corresponding to a final search.
26. The switch as claimed in Claim 23 wherein the forwarding entry further comprises:
a priority field, the priority field including an assigned priority for the received data packet.
a priority field, the priority field including an assigned priority for the received data packet.
27. The switch as claimed in Claim 23 wherein the forwarding entry further comprises:
a host traffic label field, the host traffic label field including classification data for the received data packet.
a host traffic label field, the host traffic label field including classification data for the received data packet.
38. The method for selecting a forward override for a received data packet in a switch comprising the steps of:
providing a protocol CAM, the protocol CAM comprising at least one forwarding entry, the forwarding entry including a forward;
successively searching, with respect to successive layers, the protocol CAM for forwarding entries matching portions of a received data packet; and extracting the forward override from a matching protocol entry.
providing a protocol CAM, the protocol CAM comprising at least one forwarding entry, the forwarding entry including a forward;
successively searching, with respect to successive layers, the protocol CAM for forwarding entries matching portions of a received data packet; and extracting the forward override from a matching protocol entry.
29. The method as claimed in Claim 28 further comprising the step of:
determining whether to perform another search of the protocol CAM
dependent on the state of a next field in a current forwarding entry.
determining whether to perform another search of the protocol CAM
dependent on the state of a next field in a current forwarding entry.
30. The method as claimed in Claim 28 further comprising the step of:
forwarding the received data packet dependent on the extracted forward override.
forwarding the received data packet dependent on the extracted forward override.
31. The method as claimed in Claim 28 wherein the forwarding entry further comprises:
a priority field, the priority field including an assigned priority for the received data packet.
a priority field, the priority field including an assigned priority for the received data packet.
32. The method as claimed in Claim 28 wherein the forwarding entry further comprises:
a host traffic label field, the host traffic label field including classification data for the received data packet.
a host traffic label field, the host traffic label field including classification data for the received data packet.
33. A switch comprising:
a protocol CAM comprising at least one forwarding entry, the forwarding entry including a forward override;
means for successively searching, with respect to successive layers, the protocol CAM for forwarding entries matching portions of a received data packet; and means for extracting the forward override from a matching forwarding entry.
a protocol CAM comprising at least one forwarding entry, the forwarding entry including a forward override;
means for successively searching, with respect to successive layers, the protocol CAM for forwarding entries matching portions of a received data packet; and means for extracting the forward override from a matching forwarding entry.
34. The switch as claimed in Claim 33 further comprising:
means for determining whether to perform another search of the protocol CAM dependent on the state of a next field included in a current forwarding entry.
means for determining whether to perform another search of the protocol CAM dependent on the state of a next field included in a current forwarding entry.
35. The switch as claimed in Claim 33 further comprising:
means for forwarding the received data packet dependent on the extracted forward override resulting from a final search.
means for forwarding the received data packet dependent on the extracted forward override resulting from a final search.
36. The switch as claimed in Claim 33 wherein the forwarding entry further comprises:
a priority field the priority field including an assigned priority for the received data packet.
a priority field the priority field including an assigned priority for the received data packet.
37. The switch as claimed in Claim 33 wherein the forwarding entry further includes:
a host traffic label field, the host traffic label field including classification data for the received data packet.
a host traffic label field, the host traffic label field including classification data for the received data packet.
38. The switch as claimed in Claim 1 wherein the forward override indicates whether a received data packet is to be forwarded to a host.
39. The switch as claimed in Claim 1 wherein the extracted forward override in a previous search is overwritten with the forward override extracted in the current search.
40. The method as claimed in Claim 8 wherein the forward override indicates whether a received data packet is to be forwarded to a host.
41. The method as claimed in Claim 8 wherein the extracted forward override in a previous search is overwritten with the forward override extracted in the current search.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US09/473,074 US6661791B1 (en) | 1999-12-28 | 1999-12-28 | Method and apparatus for generating forward overrides in a packet switch |
| US09/473,074 | 1999-12-28 | ||
| PCT/CA2000/001515 WO2001048975A2 (en) | 1999-12-28 | 2000-12-22 | Forward overrides in a packet switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2395491A1 true CA2395491A1 (en) | 2001-07-05 |
| CA2395491C CA2395491C (en) | 2009-12-15 |
Family
ID=23878083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002395491A Expired - Fee Related CA2395491C (en) | 1999-12-28 | 2000-12-22 | Forward overrides in a packet switch |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US6661791B1 (en) |
| JP (1) | JP4666866B2 (en) |
| CN (1) | CN1184780C (en) |
| AU (1) | AU2137201A (en) |
| CA (1) | CA2395491C (en) |
| GB (1) | GB2373403B (en) |
| WO (1) | WO2001048975A2 (en) |
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| US8327116B1 (en) * | 2003-12-08 | 2012-12-04 | Alcatel Lucent | System and method for processing multiple types of data frames |
| US7817659B2 (en) | 2004-03-26 | 2010-10-19 | Foundry Networks, Llc | Method and apparatus for aggregating input data streams |
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| US8509236B2 (en) | 2007-09-26 | 2013-08-13 | Foundry Networks, Llc | Techniques for selecting paths and/or trunk ports for forwarding traffic flows |
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-
1999
- 1999-12-28 US US09/473,074 patent/US6661791B1/en not_active Expired - Fee Related
-
2000
- 2000-12-22 CA CA002395491A patent/CA2395491C/en not_active Expired - Fee Related
- 2000-12-22 WO PCT/CA2000/001515 patent/WO2001048975A2/en active Application Filing
- 2000-12-22 GB GB0213874A patent/GB2373403B/en not_active Expired - Fee Related
- 2000-12-22 JP JP2001548968A patent/JP4666866B2/en not_active Expired - Fee Related
- 2000-12-22 CN CN00818009.1A patent/CN1184780C/en not_active Expired - Fee Related
- 2000-12-22 AU AU21372/01A patent/AU2137201A/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| US6661791B1 (en) | 2003-12-09 |
| CN1184780C (en) | 2005-01-12 |
| GB0213874D0 (en) | 2002-07-31 |
| JP4666866B2 (en) | 2011-04-06 |
| GB2373403B (en) | 2004-02-18 |
| WO2001048975A3 (en) | 2001-10-04 |
| CA2395491C (en) | 2009-12-15 |
| JP2003518873A (en) | 2003-06-10 |
| AU2137201A (en) | 2001-07-09 |
| GB2373403A (en) | 2002-09-18 |
| CN1415149A (en) | 2003-04-30 |
| WO2001048975A2 (en) | 2001-07-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20161222 |