Any 1U - 2U Ethernet switches that can handle 4K VLANs?

Mon Jan 26 01:05:56 UTC 2004

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