Re: Cisco G2 ISR WAN performance of 1Gbps?

nice article but what i gathered from the ventrefamily article is that the
way the asr's in general, including the 1004 and 1006 report int. bw is not
straight forward. it didn't mention anything about the cpu reaching 100%.

the hardware design of all the asr's and their use of the rp and esp's, the
cpu will not reach close to 100% due to forwarding traffic, (unless you have
some funky config and make this happen). the esp handles all of the
forwarding, while the cpu, which resides on the rp sits there, just chilling
out :).

the 1002 is rated for 5 gig but in actuality, that is bidirectional, so the
real number is somewhere between 2 and 2.5 gig. same logic applies for the
1004 and 1006.

if you have other documentation showing that the cpu on the 1002 takes a hit
when reaching 1gig throughput, i'd love to see it because i'll change my
recommendations if it is true. but from the testing i've persoanally done
with the 1002, it can handle 1gig with one eye closed.

ron

On Fri, Nov 20, 2009 at 10:16 AM, Andy Reid <ccie_at_reid.it> wrote:

> Hi Ron,
>
> Of course. Several studies have shown that the 1002 can get near 1Gbps
> throughput, but with no services running and 100% CPU utilization. In the
> real world you would not want to be stressing out the hardware to that
> extent. Example study:
> http://networking.ventrefamily.com/asr-ethernet-overhead
>
> In comparison, the 1006 can achieve 10Gbps throughput.
>
http://www.cisco.com/en/US/prod/collateral/routers/ps9343/ASR_1006_Summary_Re
port__as_of_1100_02Jun08.pdf
>
> If there is a real requirement for 1-10Gbps throughput then I recommend the
> 1004 or 1006 to my clients. This is typically a requirement at a medium to
> large DC, whereas the remote sites are usually connected by a WAN link
> anywhere between an 256Kbps ADSL to a 100Mbps Ethernet circuit. For these
> sites, WAN throughput is easily managed by a 800 series or ISR router
> depending upon size of link, number of users, applications, etc.
>
> The only times I need to set expectations is when the client has a fiber
> connection, that terminates at 1Gbps on the ISR, as the router is never
> going to reach anywhere near that level of throughput.
>
> regards Andy
>
> ron.wilkerson_at_gmail.com wrote:
>
> Can you provide thoughts on the 1002 and why you advise against it?
>
> Thanks.
>
> -----Original Message-----
> From: Andy Reid <ccie_at_reid.it> <ccie_at_reid.it>
> Date: Fri, 20 Nov 2009 17:51:31
> To: Azhar Mirza<azhar.mirza_at_netservicesplc.com>
<azhar.mirza_at_netservicesplc.com>
> Cc: Cisco certification<ccielab_at_groupstudy.com> <ccielab_at_groupstudy.com>
> Subject: Re: Cisco G2 ISR WAN performance of 1Gbps?
>
> Hi Azhar,
>
> The highest spec ISR G2 - 3945 - can handle 150Mbps of real throughput
> with all services turned on. If you require true Gigabit throughput then
> I suggest you look at the Cisco ASR 1000's, and not the small one,
> equipped with an appropriate SIP/SPA module.
> Remember that the ISR's are software routers.
>
> regards Andy
>
> Azhar Mirza wrote:
>
>
> Experts,
>
> I have got one question if anyone could clarify please.
>
> Are the new G2 ISRs 29xx & 39xx capable of handling 1Gbps WAN throughput
using HWIC-1GE-SFP, as 28xx/38xx had limitation *** (see below) of max
500Mbps due to HWIC interface bus speed limitation ?
>
> G2 supports EHWICs; What are the new EHWICs available? Is there any EHWICs
for 1Gbps?
>
>
> What is the best (lowest cost) Cisco router that can support 1Gbps Ethernet
WAN? Do I need ASR for this? I need three 1Gbps interfaces.
>
>
> ----------------------------------
> *** HWIC-1GE-SFP FAQ
says:http://www.cisco.com/en/US/prod/collateral/routers/ps5854/prod_qas0900ae
cd80169bf0_ps5949_Products_Q_and_A_Item.html
>
> Q. Q: What is the maximum throughput on the Gigabit Ethernet HWIC?
> A: 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.
> ----------------------------------
>
> Thanks and Kind Regards,
>
>
> Azhar Mirza
> Head of Pre Sales
>
> netSERVICES
> Waters Edge Business Park
> Modwen Road
> Manchester, M5 3EZ
>
> e: azhar.mirza_at_netservicesplc.com
> w: www.netservicesplc.com
>
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