<div>
take a look at <a href="http://www.cisco.com/en/US/products/ps5855/products_installation_guide_chapter09186a008068f3dd.html" rel="ugc">http://www.cisco.com/en/US/products/ps5855/products_installation_guide_chapter09186a008068f3dd.html</a><br />
<br />
they say that <br />
<br />
They list following routers that support booting directly from a USB device: Cisco 1841, 2801, 2811, 2821, 2851, 3825, and 3845 routers
</div>


take a look at http://www.cisco.com/en/US/products/ps5855/products_installation_guide_chapter09186a008068f3dd.html [http://www.cisco.com/en/US/products/ps5855/products_installation_guide_chapter09186a008068f3dd.html]

they say that

They list following routers that support booting directly from a USB device: Cisco 1841, 2801, 2811, 2821, 2851, 3825, and 3845 routers

<div>
I've seen that. &nbsp;However, I'm still unclear. &nbsp;Do I have to buy a cisco usb flash to simply copy images/configs to it? &nbsp;I read an article saying that you simply have to put the drive in and do a format command and it will work fine.<br />
Also i have an upgrade for my rom? &nbsp;Is there an outline of this procedure. &nbsp;I've done IOS updates but not ROM.
</div>


I've seen that.  However, I'm still unclear.  Do I have to buy a cisco usb flash to simply copy images/configs to it?  I read an article saying that you simply have to put the drive in and do a format command and it will work fine.
Also i have an upgrade for my rom?  Is there an outline of this procedure.  I've done IOS updates but not ROM.

<div>
<div class="content wysiwyg-content">
Just curious if anyone can explain the functionality of the USB ports on the Cisco routers? &nbsp;I've looked for documentation and can't see much. &nbsp;Will any USB stick work? &nbsp;Is there a procedure to make the usb stick work? &nbsp;Or is it a ciso propriatary usb port? &nbsp;The reason I ask this is that it would appear that my router has a ROMMON upgrade that claims to support boot from usb. &nbsp;Which brings me to my next question. &nbsp;Is there a guide for ROMMON upgrades. &nbsp;I can't find it anywhere either.
</div>
</div>


Just curious if anyone can explain the functionality of the USB ports on the Cisco routers?  I've looked for documentation and can't see much.  Will any USB stick work?  Is there a procedure to make the usb stick work?  Or is it a ciso propriatary usb port?  The reason I ask this is that it would appear that my router has a ROMMON upgrade that claims to support boot from usb.  Which brings me to my next question.  Is there a guide for ROMMON upgrades.  I can't find it anywhere either.

Cisco Router USB Ports and ROMMON Upgrade

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.