Cisco 2851 router gigabit Ethernet port

[fiorini143]

I have a Cisco 2851 router and need an additional gigabit Ethernet port. Can anyone tell me the part number I need to order?

Sent from Cisco Technical Support iPad App

[paolo bevilacqua]

HWIC-1GE-SFP.

However since the router is not fast enough for wire rate gigabit, there is not mich advantage in doing that.

Use an external switch instead, to make things easier and more economic.

[Joseph W. Doherty]

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

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Posting

HWIC-1GE-SFP (as also noted in Paolo's posting.)

http://www.cisco.com/en/US/prod/collateral/routers/ps5854/product_data_sheet0900aecd8016be8d.html

http://www.cisco.com/en/US/prod/collateral/routers/ps5854/prod_qas0900aecd80169bf0.html

PS:

However, as Paolo also noted, the 2851 doesn't really have the performance to support (even a single) gig port so consider carefully whether you want to add this gig port.  This port also is SFP, so if you were planning on using it just for copper, the transceiver is also going to add to the cost.

If you have a VLAN capable switch, you can configure subinterfaces on one of the existing 2851 ports and logically increase your interfaces on it that way.  You can also port channel (I recall) to the 2851.

[Joseph W. Doherty]

Disclaimer

The  Author of this posting offers the information contained within this  posting without consideration and with the reader's understanding that  there's no implied or expressed suitability or fitness for any purpose.  Information provided is for informational purposes only and should not  be construed as rendering professional advice of any kind. Usage of this  posting's information is solely at reader's own risk.

Liability Disclaimer

In  no event shall Author be liable for any damages whatsoever (including,  without limitation, damages for loss of use, data or profit) arising out  of the use or inability to use the posting's information even if Author  has been advised of the possibility of such damage.

Posting

Oh, forgot to mention:

Q. What is the maximum throughput on the Gigabit Ethernet HWIC?

A. The HWIC bus interface is limited to 400 Mbps of full duplex. The  actual throughput of the Gigabit Ethernet HWIC is limited by the  throughput of individual platforms. Under bidirectional traffic of 1518  bytes or larger, the Gigabit Ethernet HWIC can support up to an  aggregate of 350 Mbps on Cisco 2811 and 2821 routers, 400 Mbps on Cisco  2851 routers, and 500 Mbps on Cisco 3800 Series platforms.

PS:

On the later (than 2800/3800 series) ISRs with EHWICs, even they don't support full gig:

Q. What is the maximum throughput on the Gigabit Ethernet EHWIC?

A. The maximum theoretical throughput for the EHWIC-1GE-SFP-CU is 800  Mbps. Actual performance is based on the router's CPU and is dependent  on the router model.