[c-nsp] 2611XM throughput

[Adam Greene]

Thanks for the responses I received on and off list to this post.

Consensus is: 2611XM will not do 10Mbps or above.

I'll look into a 18xx or 28xx upgrade.

Thanks!
Adam

----- Original Message ----- 
From: "Justin Shore" <justin at justinshore.com>
To: "Adam Greene" <maillist at webjogger.net>
Cc: <cisco-nsp at puck.nether.net>
Sent: Tuesday, January 29, 2008 8:09 PM
Subject: Re: [c-nsp] 2611XM throughput


> Adam,
>
> I had an identically configured 2611XM in service a couple years ago. The 
> CPU maintained 70-90% during peak times.  At the time that was with about 
> 8Mbps passing through it.  One night when the router reached just under 
> 10Mbps the CPU pegged at 100% (usually I only see Cisco IOS devices report 
> 99% but this one said 100%) and fell off the network (I'm assuming that 
> OSPF timed out).  The ensuing flood of packets from behind the router 
> (cable modem network with about 400 users) easily exceeded the pps of the 
> router and kept the CPU pegged generating ICMP Destination Unreachables. 
> Even consoling into the poor thing was pointless as it took a couple 
> minutes to output a single character to the CLI.  It had 2 ACLs of about 
> 40 lines combined and was running OSPF with one neighbor (50 routes).  I 
> had a replacement 2821 overnighted to me the next day and I replaced the 
> 2611XM that night.  The performance difference was very noticeable, even 
> with the same approximate throughput.  The 2611XM introduced significant 
> delay.  IMHO the 10Mbps ceiling is absolute if not exceedingly generous.
>
> The 2611XM is good as a CE with a couple T1s.  Beyond that toss it on your 
> pile of 2500s and go buy an ISR.
>
> Justin
>
>
> Adam Greene wrote:
>> Hi,
>>
>> I'm trying to determine what kind of throughput we can expect from a 
>> 2611XM currently in production (IOS 12.3(24), 128MB RAM). The router is 
>> doing eBGP to two peers but only advertises one network and receives 
>> default routes only. Other than that it's plain vanilla.
>>
>> Cisco's router performance guide rates this router at 10.24Mbps (is that 
>> one direction at a time or bidirectional, I wonder) with an avg packet 
>> size of 64bytes. Judging from the # of packets and the # of bytes 
>> transferred on the unit's WAN interface, I'm calculating average packet 
>> size at about 154bytes per packet. Based on these specs, would it be 
>> realistic to expect the router could push about 25Mbps aggregate (for 
>> example, 12.50Mbps in both directions simultaneously)?
>>
>> Thanks for your insight.
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