I have a cisco 1841 running on a 10Mbps Metro-E connection. I recently signed an agreement for a 100Mbps Metro-E. I am wondering if I will need to purchase a new router to support this new connection or will my 1841 be able to handle the traffic.
I appreciate the quick reply. I know the interface will support the link but I am more concerned with the router supporting the traffic. We will probably never fully utilize the circuit, however, I want to make absolutely certain that the 1841 can handle the traffic from the 100Mbps link without any hiccups. Thank you again!
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Good news, bad news . . .
Actually real production capacity of many Cisco devices is often higher than the forwarding bandwidth capacity specified since that is often quoted for minimum sized packets. I.e. With "normal" traffic you're likely to be able to push more than 38.40 Mbps on an 1841.
However, forwarding bandwidth capacity is total, and WAN links (and most current Ethernet) is duplex. For example, your 100 Mbps Metro Ethernet could want to push 200 Mbps through the device. Further, the forwarding capacity bandwidth doesn't account for additional "services", and such can dramatically impact actual capacity. I've found if you divide the forwarding capacity by 4, you're usually okay. So for your 38.40 Mbps, anything up to about 9.6 Mbps should be okay. Your 1841 is unlikely to have had an issue with your 10 Mbps MetroE but I wouldn't recommend it for 100 Mbps.
I've attached a Cisco document that discusses performance of the 2900 and 3900 series ISRs.
BTW, if your not using any services that are found on routers vs. switches, you might find a small L3 switch, whether LAN variety or MetroE variety, suitable too.
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