Method for updating a hardware configuration of a networked communications device

• US 7,577,726 B1
• Filed: 02/07/2002
• Issued: 08/18/2009
• Est. Priority Date: 02/07/2002
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Conard, Theodore, Chen, Ming Chi
• Primary Examiner(s): Caldwell; Andrew
• Assistant Examiner(s): Meucci; Michael D
• Application Number:
  US10/071,811
• Time in Patent Office: 2,749 Days
• Field of Search: 709220-222, 709238-242, 717168-178, 717/111, 370/229, 370/401
• US Class Current: 709/221
• CPC Class Codes: G06F 8/654 using techniques specially adapted for alterable solid state memories, e.g. for EEPROM or flash memories

Abstract

In a method for updating a hardware configuration of a networked communications device, a networked communications device is provided with one or more programmable logic units. A first hardware configuration is determined which describes hardware features programmed into the programmable logic unit. When an updated hardware configuration becomes available, it can be downloaded into a centralized file holding configuration information for the main circuit board and add-in options cards of the networked device. The programmable logic unit is re-programmed with the second hardware configuration to provide an updated hardware configuration.

Claims

1. A system, comprising:

a server for storing operating system and hardware configuration updates for routing devices; and

a routing domain containing a plurality of routers each containing an internal routing table for identifying routes through a packet switched network, each router operating a routing protocol configured to synchronize that router'"'"'s internal routing table with the other tables in the routing domain by sending messages according to the protocol, wherein the messages propagate information about new or changed routes within the routing domain;

wherein the routing protocol is further configured to time internal routing table synchronization according to continuous measurements of communication traffic such that the internal routing table synchronization occurs when the measured communication traffic drops below a threshold level;

wherein at least one of the routers in the routing domain is encoded with instructions that, if executed, result in;

storing a default router operating system version and a default router hardware configuration in a first flash memory unit on said at least one router, said default router hardware configuration having an associated checksum and an associated timestamp indicating when said default router hardware configuration was downloaded;

downloading an updated router operating system version and an updated router hardware configuration from the server, wherein said instructions are further configured to monitor for occurrence of the routing table synchronizations and opportunistically initiate said downloading in response to observing one of the routing table synchronizations so that said download initiation coincides with timing determinations of the routing protocol, and wherein said updated router hardware configuration and said updated router operating system version are stored in a second flash memory unit of said at least one router by erasing and rewriting said second flash memory unit;

performing a checksum operation on said updated router hardware configuration to verify a received copy of said updated router hardware configuration;

creating a timestamp associated with said updated router hardware configuration to indicate when said updated router hardware configuration was downloaded;

programming a plurality of programmable logic units on said at least one router according to said updated router hardware configuration, wherein said programming occurs if said updated router hardware configuration has a correct checksum and a more recent associated timestamp than said default router hardware configuration, wherein said programmable logic units are coupled with said at least one router via a removable card, and wherein said removable card is removably attached to said at least one router;

disposing a CPU and a main memory of the at least one router on the removable card, such that the CPU and the main memory of the at least one router are coupled with the at least one router via the removable card; and

broadcasting notification of the updated router operating system version and the updated router hardware configuration across the routing domain, wherein said broadcast notification triggers the routing domain to autonomously synchronize to the new configuration;

wherein the other routers receiving the broadcast notification are configured to delay downloading their configurations from the server, if necessary, so that said downloading by the other routers coincides with the routing protocol'"'"'s timing determinations.

2. A method, comprising:

storing a default operating system version and a default hardware configuration of a networked communications device in a first flash memory unit on said networked communications device, said default hardware configuration having an associated checksum and an associated timestamp indicating when said default hardware configuration was received;

receiving an updated operating system version and an updated hardware configuration for said networked communications device over a network, wherein said updated hardware configuration and said updated operating system version are received into a second flash memory unit of said networked communications device by erasing and rewriting said second flash memory unit;

performing a checksum operation on said updated hardware configuration to verify a received copy of said updated hardware configuration;

creating a timestamp associated with said updated hardware configuration to indicate when said updated hardware configuration was received;

programming a plurality of programmable logic units on said networked communications device according to said updated hardware configuration wherein said programming occurs if said updated hardware configuration has a correct checksum and a more recent associated timestamp than said default hardware configuration, wherein said programmable logic units are coupled with said network communications device via a removable card, and wherein said removable card is removably attached to said network communications device;

disposing a CPU and a main memory of the networked communications device on the removable card, such that the CPU and the main memory of the networked communications device are coupled with the networked communications device via the removable card;

collecting information, wherein a component of said networked communications device sends a configuration description to a processor of said networked communications device;

creating said default hardware configuration, wherein said processor creates said default hardware configuration using said configuration description; and

comparing said default hardware configuration with said updated hardware configuration and initiating download of said updated hardware configuration upon request of said networked communications device based on low network usage.

3. The method as recited in claim 2, wherein said method further comprises verifying security information.

4. The method as recited in claim 2, wherein said method further comprises configuring said networked communications device with a schedule for initiating said receiving of said updated hardware configuration.

5. A router, comprising:

a bus;

a processor coupled to said bus;

a memory unit coupled to said bus, the memory unit storing instructions that, if executed by the processor, result in;

storing a default router operating system version and a default router hardware configuration in a flash memory unit on said router, said default router hardware configuration having an associated checksum and an associated timestamp indicating when said default router hardware configuration was downloaded;

downloading an updated routing operating system version and an updated routing hardware configuration for said router over a network, wherein said instructions are further configured to monitor for occurrence of a routing table synchronization controlled by a routing protocol operating on the router and opportunistically initiate said downloading in response to observing the occurrence of the routing table synchronization, and wherein said updated routing hardware configuration and said updated router operating system version are stored in said flash memory unit of said router, said flash memory unit being erasable and rewritable;

performing a checksum operation on said updated router hardware configuration to verify a received copy of said updated router hardware configuration;

creating a timestamp associated with said updated router hardware configuration to indicate when said updated router hardware configuration was downloaded;

programming a plurality of programmable logic units on said router according to said updated router hardware configuration, wherein said programming occurs if said updated router hardware configuration has a correct checksum and a more recent associated timestamp than said default router hardware configuration; and

notifying other routers of the updated router operating system version and the updated router hardware configuration, wherein the instructions are further configured to opportunistically time sending of the router-to-router notification to coincide with the occurrence of the routing table synchronization or the occurrence of a subsequent routing table synchronization.

6. The router as recited in claim 5, wherein said opportunistic download initiation corresponds to a time that the routing protocol identifies as being associated with measured network usage dropping below a preset threshold.

7. The router as recited in claim 5, wherein said instructions further result in verifying security information.

8. The router as recited in claim 5, wherein the instructions further result in comparing said default router hardware configuration with said updated router hardware configuration.

9. A machine readable medium storing instructions that, if executed, result in:

storing a default router operating system version and a default router hardware configuration in a flash memory unit on a router, said default router hardware configuration having an associated checksum and an associated timestamp indicating when said default router hardware configuration was downloaded;

downloading an updated router operating system version and an updated router hardware configuration for said router over a network, wherein said instructions are further configured to monitor for communication of a routing table synchronization message using a routing protocol operating on the router and opportunistically initiate said downloading in response to observing the communication of the routing table synchronization message, and wherein said updated router hardware configuration and said updated router operating system version are stored in said flash memory unit of said router;

performing a checksum operation on said updated router hardware configuration to verify a received copy of said updated router hardware configuration;

creating a timestamp associated with said updated router hardware configuration to indicate when said updated router hardware configuration was downloaded; and

programming a plurality of programmable logic units on said router according to said updated router hardware configuration wherein said programming occurs if said updated router hardware configuration has a correct checksum and a more recent associated timestamp than said default router hardware configuration, wherein said programmable logic units are coupled with said router via a removable card, and wherein said removable card is removably attached to said router.

10. The machine readable medium as recited in claim 9, wherein said opportunistic download initiation corresponds to a time that the routing protocol identifies as being associated with measured network usage dropping below a preset threshold.

11. The machine readable medium as recited in claim 9, wherein the instructions further result in verifying security information.

12. The machine readable medium as recited in claim 9, wherein the instructions further result in notifying another router of the updates to cause the other router to opportunistically initiate downloading of the updates by monitoring for the routing table synchronization messages.

13. The machine readable medium as recited in claim 9, wherein the instructions further result in comparing said default router hardware configuration with said updated router hardware configuration.