[66790] in North American Network Operators' Group
Re: Any 1U - 2U Ethernet switches that can handle 4K VLANs?
daemon@ATHENA.MIT.EDU (Jeff Kell)
Sun Jan 25 20:06:33 2004
Date: Sun, 25 Jan 2004 20:05:56 -0500
From: Jeff Kell <jeff-kell@utc.edu>
To: Will Hargrave <will@harg.net>
Cc: nanog@merit.edu
In-Reply-To: <20040126001827.GI5365@microserf>
Errors-To: owner-nanog-outgoing@merit.edu
Will Hargrave wrote:
> The 'recommended max' number of SVIs for the 3550 is something low like 8.
> There is no limited stated in the datasheet for the 3750 - is anyone
> running more than 8 SVIs on a 3750?
We're running 30 SVIs on a 3550-12 (only 10 active at the moment, we're
in a transition). It is an aggregation switch that feeds back via L3.
> The ACL capability on the 3550 seems a lot more capable but the lack of
> unicast RPF is irritating. (More irritating, 'ip verify unicast
> reachable-via...' is accepted but silently does nothing)
Agreed - we had PSIRT look into it and the "solution" is probably going
to be removing ip verify from the CLI parser :-( We had another 3550
replace a struggling 2621 and it blew it away.
> I'd be very interested to hear what conditions you've found cause
> problems for Cat3550s. We're planning to buy quite a few more of this range
> (probably 3750-24) to reduce L2 size in our network and for CPE-type
> uses.
In a new building deployment we used 4500 Sup-IVs as MDF/IDF anchors and
populated the distributions with 3550-48s. Most of the 4500s had one 48
port copper 10/100/1000 blade to supply gig-to-desktop where needed
(their ASICs are overloaded 8-to-1 so be careful about placement). The
4500 not only doesn't do uRPF, it doesn't do flow either.
The ACLs/MLS features are nice, supporting input ALCs, 'established'
keyword, and logging (unlike, say MLS to a 5500 NFFC). It will not
process switch these packets but rather "forks" a copy to the CPU to
log if necessary.
It is very annoying that neither 3550 nor 4500 support uRPF. Does
anyone know if the 3750 does?
Jeff
