Router for Metro Ethernet

Jeffrey Negro jnegro at
Mon Apr 12 13:26:21 CDT 2010

In our case I believe we would be dealing with just static routes and a
lines of ACL.  Do you think the routing protocols are your largest resource
usage in your scenario, or is it also just simple routing as well?

Jeffrey Negro, Network Engineer
Billtrust - Improving Your Billing, Improving Your Business
609.235.1010 x137

On Mon, Apr 12, 2010 at 1:55 PM, Dylan Ebner <dylan.ebner at> wrote:

> We use metro E for our WAN and our internet access delivery. The 2600
> series routers do not have enough horsepower to do a 40 Mb connection and
> eigrp. The 2811 can do 40 mb and eigrp but they start to have difficulty
> when you add in inspection or large ACLs. We just last week turned a 40mb
> metroe circuit into a 60mb and the router, a 2811, is now have constant
> problems. We are replacing it with a 2921. However, this router also has 2
> 100mb connections from local lans that it is also terminiating. For our
> 100mb metro e connections we use 3845s. The 100 mb service terminates into
> NM-GEs, which have a faster throughput than the hwics. This setup works
> well.
> On our internet edges we use 2811s with their memory maxed. We have partial
> BGP routers from 2 isps. One connection is a 30mb and the other is a 25mb.
> no inspection is done on these but we do have stateless acls running on the
> inbound. these are running just fine today, but they sit at about 20% cpu
>  all the time.
> When doing a metro e connection, make sure the router/switch can do traffic
> shaping. If it can't, you are relying on the provider to shape your outgoing
> traffic, which of course will happen down the line, adding additional delay
> during high usage times.
> You should also look at the new cisco small metro switches. They can
> traffic shape, do bgp and have more than one interface. one of the annoying
> thing about metro e(at least with qwest) is  they have a tendancy to install
> new pe switches at your locations when you upgrade your service. this means
> a new connection from them and unless you have extra fiber or copper ports
> on your router. So to transition to the new circuit, you need to unplug your
> existing service first. And that means downtime, which no one likes.
> Dylan
> -----Original Message-----
> From: Jeffrey Negro [mailto:jnegro at]
> Sent: Monday, April 12, 2010 12:29 PM
> To: nanog at
> Subject: Router for Metro Ethernet
> Before I get taken for a ride by salespeople, I figured it would be best to
> ask the experts of Nanog....
> My company is currently in talks to bring an ethernet circuit into our
> headquarters, initially committing around 40Mbps.  The ISP will be
> providing
> ethernet handoff, but I do not want their managed router offering (Adtran
> 4430) since it is pricey, non-redundant and I'd rather manage it myself.
>  My
> question is about hardware.  Can I assume that I can use something like a
> Cisco 2000 series router with two built in fast/gig ethernet ports, without
> a WIC?  and since both sides are ethernet would the routing throughput be
> near fast ethernet speed?  This is my first dealing with metro ethernet
> offerings, and I don't want to assume that the Cisco throughput rates
> listed
> for T1/ADSL etc. are the same for a metro ethernet as the WAN.
> Any and all suggestions on the hardware would be greatly appreciated.
>  Thank
> you in advance!

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