[c-nsp] advice for L2 switches

[Kevin Blackham]

Did I mention this is spread out over 20,000 square feet?   I'll have to do
some math on huge wads of non-reusable cable.  I had avoided the
big-and-dense option due to that hassle.

On 6/22/07, Sridhar Ayengar <ploopster at gmail.com> wrote:
>
> Kevin Blackham wrote:
> > We're promoting a one day event that requires around 500 FE access
> ports.  I
> > need to filter at layer 4 (block DHCP serving) and perform some QoS
> duties
> > to ensure a good experience.  40x 2950T-24 will do the job, but even on
> the
> > grey market I'm looking at a $20k project (including larger agg
> switch).  On
> > the lower end, I might be able to use 2924XL with protected port/port
> > blocking (effectively isolated private-vlan), as long as I can perform a
> > U-turn after filtering (sorta breaks split-horizon doesn't it, perhaps
> local
> > proxy-arp at L3) and instead have more intelligence at the
> aggregator.  I
> > would lose out on DHCP snooping and full control over QoS by this plan
> > though.  I'm willing to give up QoS at the access port, and apply to the
> agg
> > switch, but I really need option-82 so I know exactly who has what IP
> when
> > the time comes to kick someone in the head.
> >
> > Recommendations?  The only hard requirements are low cost (grey market
> ok),
> > SNMP stats, option-82, and 24-25 100M ports.  Preferred are L4 QoS
> marking,
> > two egress queues per port, L4 filtering.  No L3 forwarding is needed.
>
> A pair of Cisco 5513s should get you to the number of ports and do it on
> the cheap on the used market.  They do have Layer 4 filtering features,
> but what I don't know is whether you need the Route Switch Module + IOS
> to use them.
>
> Peace...  Sridhar
>