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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