[c-nsp] Switch recommendation

[Peter Salanki]

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I think you will run into some major broadcast "storms" of arps and  
dhcp requests, but this is maybe controllable with filters?

/Peter Salanki
Bahnhof (AS8473)
Stockholm, Sweden

9 nov 2005 kl. 17.41 skrev Vincent De Keyzer:

> Well, OK, I see your point - and I got the same question off-list  
> too, so
> here is the situation:
>
> This is for a (pre-)Wimax service. We need to cover the whole city  
> with 100
> base stations, with up to 200 users per BS - that's what gives the  
> 20,000
> figure.
>
> The L2 domain has to spread over the whole city, because a user  
> might roam
> across BSs, and he should be able to continue working without  
> renewing his
> IP address (we made a test on a tramway recently, and it worked  
> fine over a
> journey of several kilometers).
>
> But indeed we will slice this into several flat L2 networks, just  
> to limit
> the size of the broadcast domain.
>
> Still, the switches close to the default gateways will need to know  
> all
> these MAC addresses (even if in separate VLANs).
>
> Vincent
>
>
>
>> -----Original Message-----
>> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
>> bounces at puck.nether.net] On Behalf Of Tim Durack
>> Sent: mercredi 9 novembre 2005 17:15
>> To: Vincent De Keyzer
>> Cc: cisco-nsp at puck.nether.net; Church, Chuck
>> Subject: Re: [c-nsp] Switch recommendation
>>
>> I think what Chuck is trying to say is: How big is your L2 broadcast
>> domain!!??
>>
>> I know we had severe pain when we were running large, flat L2 domains
>> in the 1000+ MAC range. I shudder to think what 10,000+ would be  
>> like.
>>
>> But maybe your environment is much more controlled...
>>
>> Tim:>
>>
>> On 11/9/05, Vincent De Keyzer <vincent at dekeyzer.net> wrote:
>>
>>> A handful. Today 2, tomorrow maybe 10?
>>>
>>> Vincent
>>>
>>>
>>>> How many VLANs?   (Please don't say '1')...
>>>>
>>>>
>>>> Chuck Church
>>>> Lead Design Engineer
>>>>
>>>> -----Original Message-----
>>>> From: cisco-nsp-bounces at puck.nether.net
>>>> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Vincent De
>>>> Keyzer
>>>> Sent: Wednesday, November 09, 2005 7:19 AM
>>>> To: cisco-nsp at puck.nether.net
>>>> Subject: [c-nsp] Switch recommendation
>>>>
>>>> Hello,
>>>>
>>>>
>>>>
>>>> I have the following requirements for a switch :
>>>>
>>>> *     ability to handle over 20,000 MAC addresses
>>>> *     a few GigE ports (1 now, maybe 4 later)
>>>> *     a few FE ports (6 now, maybe 12 or 16 later)
>>>> *     no layer 3 required
>>>>
>>>>
>>>>
>>>> I have the feeling that those requirements are somewhat unusual - a
>>>>
>> few
>>
>>>> ports vs. a large number of MAC addresses.
>>>>
>>>>
>>>>
>>>> Is the 4503 a good choice for those requirements? What cards  
>>>> should I
>>>> stick
>>>> in there?
>>>>
>>>>
>>>>
>>>> Is there anything cheaper that would do the job?
>>>>
>>>>
>>>>
>>>> Vincent
>>>>
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>>>
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>>
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>
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