6509 Redundancy

Unanswered Question
Jul 28th, 2008


I have a core 6509 with dual sup720's and dual power supplies. Management is concerned that this is a single point of failure. What are the chances that this will totally fail? Is there a big risk here?


I have this problem too.
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Edison Ortiz Mon, 07/28/2008 - 07:21

The 'chance' is always there and you do have a single point of failure.

Ideally, running dual 6509 Cores - each with a single Supervisor - is the common design, if you have budget constraints.




JORGE RODRIGUEZ Mon, 07/28/2008 - 07:37

Im with Edison, this is the million dollar question! we have 6509 switches, they are about 9 years old and has never crashed, I mean the chassis.

I have had sup crashes but standby takes over.

On the other hand I have seen brand new 6509 out of the box and chassis has developed problems, possibly damaged during shipping.

Put asside what type of Network Devices brand your company is using, whether is Cisco or others. What it comes down to is "return on investment", and how much your company will be willing to take losess in terms of $$$ should the company's CORE network failed.

As a network administrator/engineer you should always provide and present to management the design guidelines and the risks for not investing in more fault tolerant architecture DUAL CORE, chanses that a chassis will fail is slim if properly grounded but you never know.



lamav Mon, 07/28/2008 - 08:21

Besides everything that Jorge and Edison have said, theres also the amount of tolerable downtime that exists.

I used to work for a client that was willing to tolerate a 12-hour turn around time for repair. He had a service contract with Cisco for a 4-hour swap-out commitment.

So that was that. He had 1 switch and only 1 SUP, in fact, and was happy.



DARYLE DIANIS Mon, 07/28/2008 - 08:29

thanks to everyone, to complicate things, its a collapsed backbone, so all the servers connect here. It also has the fwsm, idsm and nam. So, I need rack space, all the modules, I assume, more power and the servers need to be dual homed, too. Its going to be a big project. But, the bottom line is the business, so I if my management is willing, I should go ahead.

Edison Ortiz Mon, 07/28/2008 - 11:05

But, the bottom line is the business, so I if my management is willing, I should go ahead.

Very key statement. Present it to the management and let them decide. If something happens, it was not because you didn't bring it up.




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