From: Jay Hennigan (jay@west.net)
Date: Wed Jul 02 2003 - 12:36:34 GMT-3
On Wed, 2 Jul 2003 wing_lam@jossynergy.com wrote:
> Hi group,
>
> I was challenged by a customer that that in a secnario of two switch
> connected by full duplex Fast Ethernet trunk, he said this trunk can always
> got 100 M traffic for the case that all ports are connected by host and
> each generates substantial of traffic.
>
> Just want to confirm that whether this is true? or the traffic is limited
> to the back plane of the switch? If that trunk is in half duplex, am I just
> divid the through by half?
Tha aggregate of all VLANS passing through the trunk between switches
will be limited to 100 Mbps in each direction.
If half duplex, substantially less due to the collision-retry factor.
You can't just divide by half because the traffic may be asymmetric.
> Also, peoples always mention the (pps) to sizing a switch, what does this
> (packet per second) mentioning? does it mentioning the performance of
> pakect forwarding rate at 64 byte or 1500 byte? or the pps should varies in
> different packet size?
In addition to the capacity of the switching matrix in terms of raw
throughput, the logic of the switch in making decisions as to the
disposition of a frame (forward, flood, or filter) is a limiting
factor. Switches deal in frames, not packets. PPS specifications
are more typical of routers or layer 3 switches (which is marketspeak
for routers with lots of ethernet ports).
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anyway. You're not actually reading this, are you? I didn't think so.
-- Jay Hennigan - CCIE #7880 - Network Administration - jay@west.net WestNet: Connecting you to the planet. 805 884-6323 WB6RDV NetLojix Communications, Inc. - http://www.netlojix.com/
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