Can a 3750G really switch beween VLANs at line rate ? (1Gbps)

Unanswered Question
Jan 23rd, 2008
User Badges:


According to the 3750G spec, it forwards at line rate !?!

So, does this product really forward/switch between VLANs at 1Gbps ?

That's awefully fast.


  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
Anonymous (not verified) Tue, 01/29/2008 - 07:00
User Badges:

The port ASIC of the 3750 has an output capacity of 4.4 Gbps. The ASIC can be implemented in one of two ways:

24 ports of 10/100 + 2 Gig port can be assigned to a single port ASIC which would give 4.4 Gig. Or, 4 ports of 1 Gig can be assigned to a single port ASIC which would give 4.0 Gig; which

undersubscribes the ASIC.

mcroft Tue, 01/29/2008 - 07:19
User Badges:

Thanks for the response.

However, I cannot find reference to this in the link, is it an actual soft configuration to implement ASIC usage in this way ?

I never seen this before

Thank you.


Joseph W. Doherty Tue, 01/29/2008 - 13:50
User Badges:
  • Super Bronze, 10000 points or more

The performance specifications of the 3750 series should not support line rate across all ports for some models (generally the 48 gig port models). See Table 2 "Performance" in Note the 32 gig fabric limitation and the various Mpps ratings.


This Discussion