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WS-C3850-24S-E (24 ports) - Layer 2 and Layer 3 backplane

All,

It was not clear to me what is the backplane of the switch WS-C3850-24S-E (24 ports). I need to know what is the backplane for layer 2 and layer 3.

Does anyone have this information?

Thank you!

Luciane de Medeiros

2 ACCEPTED SOLUTIONS

Accepted Solutions
VIP Super Bronze

Hi, See table-8 in this link.

Hi,

 

See table-8 in this link.  The switch capacity It is by the number of ports and not layer-2/3

http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-3850-series-switches/data_sheet_c78-720918.html

 

176 Gbps on 48-port models

92 Gbps on 24-port models

68 Gbps on 12-port model

HTH

VIP Super Bronze

Hi,That is correct.  On the

Hi,

That is correct.  On the 3750x series, regardless of the number ports they all have the same capacity which is 160 vs 92 and 176 on the 3850s. On the other hand, the 3850s can work as a wireless controller, but the 3750xs don't have this capability.

HTH

6 REPLIES
VIP Super Bronze

Hi, See table-8 in this link.

Hi,

 

See table-8 in this link.  The switch capacity It is by the number of ports and not layer-2/3

http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-3850-series-switches/data_sheet_c78-720918.html

 

176 Gbps on 48-port models

92 Gbps on 24-port models

68 Gbps on 12-port model

HTH

Hi Reza,Thanks for the

Hi Reza,

Thanks for the feedback.

Can I understand that the Cisco 3750X-24 has 160 Gpbs, more performance that the 3850-24 (96 Gbps)?

Luciane de Medeiros

VIP Super Bronze

Hi,That is correct.  On the

Hi,

That is correct.  On the 3750x series, regardless of the number ports they all have the same capacity which is 160 vs 92 and 176 on the 3850s. On the other hand, the 3850s can work as a wireless controller, but the 3750xs don't have this capability.

HTH

Hi Reza, All right! Thank you

Hi Reza,

 

All right! Thank you! ;-)

 

Luciane de Medeiros

VIP Super Bronze

Glad to help and thanks for

Glad to help and thanks for the rating.
 

Super Bronze

DisclaimerThe Author of this

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Posting

The 3750 may not have more useful performance, in fact, if you stack them, it may have (much) less (StackWisePlus's 64Gbps vs. StackWise-480).

On some switches, it appears Cisco uses the same fabric in different models, but you only need the bandwidth to support your ports.  Both the 3750X and 3850, with 24 gig ports, support dual 10g uplinks.  So, total fabric bandwidth needed is (24 + 20) * 2 = 88 Gbps.  If the fabric provides that much bandwidth, you're got as much you need (or that you can ever use).

Where the "excess" bandwidth might be needed on these switches is to support the stacking ports.  On the 3750X, that would require an additional 64 Gbps.  On the 3850, that would require an additional 480 Gbps.  (From Cisco specifications, it's unclear whether either switch's stacking ports "counts against fabric bandwidth, as do the other ports.)

 

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