3750 4500 architecture comparison

Unanswered Question
Mar 15th, 2007

I am doing a switch comparison between the 3750 stack and the 4500. I am comparing the 3750G-48TS with the 4510R (SupV and 4548-GB-RJ45 line card).

I have found information showing that the 4500 chassis supports 6 Gbps per slot. The 3750 shows it being 32 Gbps, but each Port ASIC supports 8 Gbps and it is my understanding that the 3750 runs in bus. So, traffic destined to a 3750 that must traverse a 3750 that is in between them, comes into it from the stack and goes through each Port ASIC. Each Port ASIC is treated as a node on the ring. Does that mean that the true throughput is the lowest common factor, that being the 8 Gbps limitation of the Port ASIC?

Also, how is the forwarding rate performed? Why is the 4500 sup V that that much greater? How does it change for the 3750 in stack mode?

I have this problem too.
0 votes
  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
oso Wed, 03/21/2007 - 19:57

Some key differences:

3750 offers distributed CEF (like) functionality where-by you can do a CEF lookup at each switch in the stack.

4500 offers a centralized packet forwarding architecture, which is the fastest/lowest-latency in the market.

The total packet forwarding rate of a 3750 doesn't change per se. It would then be an aggregate of the whole stack, and still keeping in mind that you are limited to the "32gb backplane" of the 3750 architecture.



This Discussion