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4948 IPv6 Throughput

 

 

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sethm at rollernet

Nov 6, 2009, 1:26 PM

Post #1 of 4 (128 views)
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4948 IPv6 Throughput

The only thing I can find on the 4948 for IPv6 performance is that it's
"in software". Does anyone know what that means?

~Seth
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sethm at rollernet

Nov 6, 2009, 2:40 PM

Post #2 of 4 (114 views)
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Re: 4948 IPv6 Throughput [In reply to]

Marco van den Bovenkamp wrote:
> Seth Mattinen wrote:
>
>> The only thing I can find on the 4948 for IPv6 performance is that it's
>> "in software". Does anyone know what that means?
>
> Yes, it means 'It can't really do it, but we pretend it can'
>


I figured as much.

~Seth
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maillist at thelan

Nov 6, 2009, 6:06 PM

Post #3 of 4 (109 views)
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Re: 4948 IPv6 Throughput [In reply to]

Seth Mattinen wrote:
> Marco van den Bovenkamp wrote:
>
>> Yes, it means 'It can't really do it, but we pretend it can'
>>
>
>
> I figured as much.
Well, what exactly do you want to know? It means the switch punts all
IPv6-packets destined for another prefix to the CPU rendering it quite
useless for forwarding IPv6 packets, but it will probably work fine with
IPv6 for management (telnet, snmp, etc).

If you want performance numbers my bet is you won't be able to push more
than about 75-100Mbps under ideal conditions (all 1500B or 9KB packets),
but it all depends on the traffic. It is impossible to predict the
performance of a switch doing forwarding in software.

--
Harald Firing Karlsen
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sethm at rollernet

Nov 7, 2009, 12:54 AM

Post #4 of 4 (104 views)
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Re: 4948 IPv6 Throughput [In reply to]

Harald Firing Karlsen wrote:
> Seth Mattinen wrote:
>> Marco van den Bovenkamp wrote:
>>
>>> Yes, it means 'It can't really do it, but we pretend it can'
>>>
>>
>>
>> I figured as much.
> Well, what exactly do you want to know? It means the switch punts all
> IPv6-packets destined for another prefix to the CPU rendering it quite
> useless for forwarding IPv6 packets, but it will probably work fine with
> IPv6 for management (telnet, snmp, etc).
>
> If you want performance numbers my bet is you won't be able to push more
> than about 75-100Mbps under ideal conditions (all 1500B or 9KB packets),
> but it all depends on the traffic. It is impossible to predict the
> performance of a switch doing forwarding in software.
>

General forwarding, access lists, etc. Anything you would do with IPv4
right now but in a dual-stack network where things prefer IPv6 first.
I'm using 3750's and their TCAM space for v6 stuffs is somewhat tiny.

~Seth
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