[c-nsp] DWDM optics on 6500s

[Azher Mughal]

In order to use SFP+ from other vendors in Arista, you need to get them 
enabled first.

-Azher

Nick Hilliard wrote:
> On 05/10/2009 15:35, Jeff Bacon wrote:
>> Admittedly, for the cost, I can buy an arista 1U for wave passthru and
>> just tap multiple 1Gs over to the 6500.
>
> Aristas use SFP+.  Good luck running colours over them. :-)
>
> Actually, Optoway in Taiwan produce CWDM SFP+ transceivers.  I don't 
> know anyone using them, but given the power constraints imposed by the 
> SFP+ form factor, I wouldn't expect long reach or anything.
>
>> Why "particularly with 6704 blades"? Is there something particularly
>> wrong with them?
>
> Depends on what you do with them.  They are a first generation blade, 
> and are 6yo technology at this stage and, well, things have moved on 
> since 2003.  XENPAK is moribund as a transceiver type which means that 
> any money you invest into buying transceivers will probably be written 
> off when you retire the blade.
>
> If you're concerned about storm control (which personally, I am), the 
> 6704 can only limit to 0.33% of port capacity, which means that if you 
> get a broadcast / multicast storm on a 6704 port, it will bang out 33 
> megs of data before storm control even notices.  Most hosts will 
> happily ignore the multicast traffic, but the broadcast traffic could 
> cause serious trouble.
>
> If you need to push wire-speed 10G on a 6704, there are conflicting 
> reports as to whether this works well.  Some people say yes; others no 
> - there's lots of discussion about this in the c-nsp archives.  It can 
> help to use a DFC if you're banging out a lot of traffic, but that's 
> extra €€€ on top of a product which already has a high cost per port.
>
> The 6708 is lots better than the 6704 if you operate it in non- 
> oversubscribe mode, apart from anything else, it has a built-in DFC, 
> which means that you don't need to retrofit this for high traffic 
> environments.
>
> As I said, it depends on what you want to do.  If you're running just 
> a couple of gigs and don't care about the broadcast traffic problem 
> or, say, are using them for L3 traffic instead of L2, then they are 
> great. Similarly, the C65k+sup720 platform makes a really nice high 
> density, feature rich 1G platform.  But if you're planning to run lots 
> of very high bandwidth stuff, it might be better to use a different 
> platform.
>
> Nick
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