[c-nsp] router / switch recommendation

[Adam Greene]

Aha ... here we go, Aivars ... I'll be studying this to get a deeper picture
of QoS capabilities on the 3750.

http://www.cisco.com/en/US/customer/products/hw/switches/ps5023/products_configuration_guide_chapter09186a00802c1100.html#wp1163879

Looks like there are some shaping capabilities (SRR or shaped round robin)
on egress ports. Of course, at this point, I don't even know if I need
shaping or should stick wth sharing.

Thanks for pointing me in the right direction.

Adam

----- Original Message ----- 
From: "Andris Zarins" <andris.zarins at microlink.lv>
To: "Adam Greene" <maillist at webjogger.net>
Cc: "[c-nsp]" <cisco-nsp at puck.nether.net>
Sent: Monday, October 17, 2005 12:00 PM
Subject: RE: [c-nsp] router / switch recommendation


3750 series support WRR - weighted round robin, meaning - you can
'shape' (not police) each of outgoing queues to some value. Yes, this
works. Only - max number of queues is very small, and as far as I know -
step between two available shaping values is 6% of line speed, at
gigabit this is 60mbit.. what gives exceptionaly poor granularity :(

I'd look towards 3750-metro only in cases I need MPLS functionality it
offers. This is the only case, otherwise - it's too overpriced.

I'd be glad to be wrong about shaping ;)

Andris



-----Original Message-----
From: Adam Greene [mailto:maillist at webjogger.net]
Sent: Monday, October 17, 2005 6:55 PM
To: Andris Zarins
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] router / switch recommendation

Hmmm... I see the "metro" versions of the 3750 appear to support MPLS &
QoS
shaping, but are 2-3 times more expensive. Still much less than a
4500/6500
though, that's for sure.

I'm not too familiar with QoS, unfortunately. We're starting to get some
customers who will rely on us for VoIP transport, though, so it's going
to
be more and more of an issue. I'll do some reading up on shaping vs
policing
so I can see if I really need the shaping. I see the 3750's are starting
to
support something called AutoQoS. Maybe that will simplify things.

Thanks much,
Adam


----- Original Message ----- 
From: "Andris Zarins" <andris.zarins at microlink.lv>
To: "Adam Greene" <maillist at webjogger.net>
Sent: Sunday, October 16, 2005 9:30 AM
Subject: RE: [c-nsp] router / switch recommendation


I'd definately vote for 3750. It will support all of features you
mentioned, plus a lot higher potential data rates. SVI count is limited
by device's memory only.

I'd choose router (say, some 2800/3800 series) only in case I need some
features that switch can't support, like MPLS or advanced QoS things,
like shaping (switches can do policing, not shaping),  or if I need to
terminate some non-ethernet links, like serial or ATM. In most other
cases - switch is better option.

Hope that helps,
Andris


---
[This e-mail was scanned for viruses by Webjogger's AntiVirus Protection
System]

---
[This e-mail was scanned for viruses by Webjogger's AntiVirus Protection
System]


---
[This e-mail was scanned for viruses by Webjogger's AntiVirus Protection System]