Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

Catalyst 3550 Performance

Hi,

I have a doubt about the catalyst performance of 3550 if I suppose that the traffic is only voice over IP.

I don't know the maximum throughput (kpps) of Catalyst 3550.

Can someone help me?

Thanks.

Paolo

1 ACCEPTED SOLUTION

Accepted Solutions
Silver

Re: Catalyst 3550 Performance

It's not traffic dependent , it depends on the size of the packet usually, its represented for a packet of size 64 bytes. The usual size of voice packet ranges from 80 to 256 bytes.So you will find a variation in the number of packets per second for voice.This again varies depending upon the voice codecs that is being used.

Refer this link http://www.cisco.com/en/US/tech/tk652/tk698/technologies_white_paper09186a00800a8993.shtml#packetizationdelay

These are the specification of 3550 and againg it depends upon the model too.

17.0 Mpps forwarding rate for 64-byte packets (Catalyst 3550-12G and 3550-12T), 10.1 Mpps forwarding rate for 64-byte packets (Catalyst 3550-48), 6.6 Mpps forwarding rate for 64-byte packets (Catalyst 3550-24, 3550-24 PWR, 3550-24-DC, and 3550-24-FX)

more details are avialable in http://www.cisco.com/en/US/products/hw/switches/ps646/products_data_sheet09186a00800913d7.html

2 REPLIES
Silver

Re: Catalyst 3550 Performance

It's not traffic dependent , it depends on the size of the packet usually, its represented for a packet of size 64 bytes. The usual size of voice packet ranges from 80 to 256 bytes.So you will find a variation in the number of packets per second for voice.This again varies depending upon the voice codecs that is being used.

Refer this link http://www.cisco.com/en/US/tech/tk652/tk698/technologies_white_paper09186a00800a8993.shtml#packetizationdelay

These are the specification of 3550 and againg it depends upon the model too.

17.0 Mpps forwarding rate for 64-byte packets (Catalyst 3550-12G and 3550-12T), 10.1 Mpps forwarding rate for 64-byte packets (Catalyst 3550-48), 6.6 Mpps forwarding rate for 64-byte packets (Catalyst 3550-24, 3550-24 PWR, 3550-24-DC, and 3550-24-FX)

more details are avialable in http://www.cisco.com/en/US/products/hw/switches/ps646/products_data_sheet09186a00800913d7.html

New Member

Re: Catalyst 3550 Performance

Thank you very much for your information.

At the end, I have calculate the convertion from G.711 to IP packet with 10 msec of latency.

After the calculation the minimum packet size is 80 byte.

This packet size multiplied for the channel number I obtained the total bandwidth and the forwarding rate is enough low regarding the limit of 6.6 Mpps, as you write.

Note that I didn't consider the overhead give by the packet header.

By the way, thank you to help me.

Best regards.

Paolo

251
Views
0
Helpful
2
Replies