[nsp] Catalyst 3550-12T

[James Galliford]

I see.  I won't need to do any .1q tunneling, I just need basic VLAN
tagging.  In which circumstances would I need to use .1q tunneling?

-----Original Message-----
From: sthaug at nethelp.no [mailto:sthaug at nethelp.no] 
Sent: Tuesday, May 11, 2004 8:03 AM
To: James Galliford
Cc: rhayden at geek.net; cisco-nsp at puck.nether.net
Subject: RE: [nsp] Catalyst 3550-12T


> You're right, that is the showstopper for us.  I must have dot1q 
> capabilities on the switch.  Why would they decide to push a device 
> that does not have .1q?

The 3750 can of course do basic 802.1q VLAN tagging. What it cannot do
is two levels of 802.1q tagging, what Cisco calls 802.1q tunneling:

http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12119ea1/3550s
cg/swtunnel.htm#1008908

(from the 3550 documentation).

Steinar Haug, Nethelp consulting, sthaug at nethelp.no

> -----Original Message-----
> From: sthaug at nethelp.no [mailto:sthaug at nethelp.no]
> Sent: Monday, May 10, 2004 3:30 PM
> To: rhayden at geek.net
> Cc: James Galliford; cisco-nsp at puck.nether.net
> Subject: Re: [nsp] Catalyst 3550-12T
> 
> 
> > Depending on your specific port needs, the 3750-24TS might be a 
> > better model for you.  More ports, faster CPU, and cheaper.  The 
> > 3750 line is
> 
> > Cisco's new flagship line with the 3550 being older (and hence 
> > earlier
> to
> > retirement).
> > 
> > I've had good luck with 3750s.
> 
> ... but the 3750 cannot do 802.1q tunneling ("QinQ"), while the 3550 
> can. In some circumstances, that is a showstopper.
> 
> Steinar Haug, Nethelp consulting, sthaug at nethelp.no
> 
> > 
> > On Mon, 10 May 2004 sthaug at nethelp.no wrote:
> > 
> > > > I'm considering the purchase of a Cisco 3550-12T for a medium
> > > > sized PoP. Could someone lend a review of the 3550 series
switches
> 
> > > > with regards to reliability, ease of use, etc.
> > > 
> > > We have no direct experience with the 3550-12T model, but have 
> > > lots
> > > of experience with 3550-12G and 3550-24.
> > > 
> > > In general the 3550 series have worked well for us. They have some
> > > limitations, which may or may not be relevant for you:
> > > 
> > > - Limited size of the MAC address table.
> > > - Limited number of simultaneous VLANs (1024).
> > > - For L3: Limited number of SVIs, limited size of the routing 
> > > table.
> > > 
> > > (It was a great disappointment to us that the 3750 Metro, which is
> > > more related to the 3550 than to the rest ofthe 3750 series,
didn't 
> > > improve on the size of the MAC address table or the number of 
> > > simultaneous VLANs.)
> > > 
> > > Ease of use: If you're familiar with IOS, you'll find the 3550s
> > > mostly like any other Cisco router, and pretty easy to use.
> > > 
> > > Reliability: We've had few 3550-24 DC switches which have been 
> > > DOA.
> > > Not relevant for you, since there is no DC model of the 3550-12T. 
> > > Aside from that, no significant problems.
> > > 
> > > Steinar Haug, Nethelp consulting, sthaug at nethelp.no
> > > _______________________________________________
> > > cisco-nsp mailing list  cisco-nsp at puck.nether.net 
> > > https://puck.nether.net/mailman/listinfo/cisco-nsp
> > > archive at http://puck.nether.net/pipermail/cisco-nsp/
> > > 
> > 
>