[c-nsp] How many maximum routes does Cisco 2900 router support?
Nick Cutting
ncutting at edgetg.co.uk
Sun Jan 10 05:38:47 EST 2016
I have tested Pure routing on this platform a few times using iPerf on a LAN, and alternatively ookla speedtest on a 1 gig internet handoffs with just BGP default route
max speeds are 335 Megabits per second - I cannot get it to go faster.
The physical interfaces speeds are 1 gig
Add NAT / Ipsec / NBAR etc and it goes way down.
Also Netflow lite - seems to tax the CPU massively on these routers.
Old-style netflow is fine
-----Original Message-----
From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Blake Dunlap
Sent: 10 January 2016 09:52
To: Adam Greene
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] How many maximum routes does Cisco 2900 router support?
The main I'd be worried about is not cpu average being high, but overruns - microbursts that just get tail dropped on the floor because the input buffer isn't processed fast enough and it fills. The pps capacity of the 2900s is quite low for the interface sizes they support.
On Sat, Jan 9, 2016 at 6:56 AM, Adam Greene <maillist at webjogger.net> wrote:
> Robert,
>
>
>
> Sure. Running Cisco IOS Software, C2900 Software (C2900-UNIVERSALK9-M), Version 15.4(3)M2, RELEASE SOFTWARE (fc2).
>
>
>
> We are receiving a single full routing table, but we are also delivering it in its entirety to a downstream customer that is multi-homed.
>
>
>
>
>
> 344444333333333333333333333333333333333335555533333444443333
>
> 322222999994444400000666666666644444777770000055555222229999
>
> 100
>
> 90
>
> 80
>
> 70
>
> 60
>
> 50 *****
>
> 40 ********** ********** ************************
>
> 30 ************************************************************
>
> 20 ************************************************************
>
> 10 ************************************************************
>
> 0....5....1....1....2....2....3....3....4....4....5....5....6
>
> 0 5 0 5 0 5 0 5 0 5 0
>
> CPU% per second (last 60 seconds)
>
>
>
>
>
>
>
>
>
> 565555555464444655644457445554645444454554465555555545454554
>
> 071404042543363432374201616909481866807006905851274071868738
>
> 100
>
> 90
>
> 80
>
> 70 * *
>
> 60 * * * * * ** * **** * * *
>
> 50 *********** * ***** *** ****#*****************************
>
> 40 ######*#**#************#***#**#**#***#****#########***###**#
>
> 30 ############################################################
>
> 20 ############################################################
>
> 10 ############################################################
>
> 0....5....1....1....2....2....3....3....4....4....5....5....6
>
> 0 5 0 5 0 5 0 5 0 5 0
>
> CPU% per minute (last 60 minutes)
>
> * = maximum CPU% # = average CPU%
>
>
>
>
>
>
>
>
>
>
> 7768676667979977986798986586977798879897767797766767757975668766679788
> 87
>
>
> 1916360723555961968895338147974596041336971997505126065922441236475457
> 74
>
> 100 * ** * * * * * * *
>
> 90 * * ** ** *** * ** * * * * * ***
>
> 80 * * * ***** ** ***** * ** **** ***** **** * ** * ** ***
>
> 70 ** * * * **************** ********************* ** ** *** ** * *******
>
> 60 ************************* *******************************
> **************
>
> 50
> **********************************************************************
> **
>
> 40
> ************#**********************#********#*************************
> **
>
> 30
> ##*******################**#****#*###############*********############
> ##
>
> 20
> #####*##############################################***###############
> ##
>
> 10
> ######################################################################
> ##
>
> 0....5....1....1....2....2....3....3....4....4....5....5....6....6....7..
>
> 0 5 0 5 0 5 0 5 0 5 0 5 0
>
> CPU% per hour (last 72 hours)
>
> * = maximum CPU% # = average CPU%
>
>
>
> ROUTER#sh ip bgp sum
>
> 607161 network entries using 87431184 bytes of memory
>
> 607163 path entries using 48573040 bytes of memory
>
> 89290/89249 BGP path/bestpath attribute entries using 14286400 bytes
> of memory
>
> 79236 BGP AS-PATH entries using 3440300 bytes of memory
>
> 477 BGP community entries using 23614 bytes of memory
>
> 0 BGP route-map cache entries using 0 bytes of memory
>
> 0 BGP filter-list cache entries using 0 bytes of memory
>
> BGP using 153754538 total bytes of memory
>
> BGP activity 7031767/6424603 prefixes, 7707260/7100097 paths, scan
> interval 60 secs
>
>
>
> Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
>
> <upstream> 4 12271 15142572 641068 82413333 0 0 29w0d 607147
>
> x.x.x.x 4 20208 144341 144319 82413371 0 0 13w0d 1
>
> x.x.x.x 4 20208 381849 420157 82413371 0 0 37w6d 1
>
> <downstream> 4 25669 230082 11237087 82413333 0 0 20w5d 1
>
>
>
> Thanks,
>
> Adam
>
>
>
>
>
>
>
> From: Robert Hass [mailto:robhass at gmail.com]
> Sent: Friday, January 8, 2016 11:38 AM
> To: Adam Greene <maillist at webjogger.net>
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] How many maximum routes does Cisco 2900 router support?
>
>
>
> On Fri, Jan 8, 2016 at 3:23 PM, Adam Greene <maillist at webjogger.net <mailto:maillist at webjogger.net> > wrote:
>
> Our 2921 with a full routing table, 2GB RAM, and around 60M aggregate
> throughput hovers around 40-50% CPU utilization, with occasional
> higher spikes. When we were pushing >100M aggregate through it, the
> CPU was regularly spiking to near 100%.
>
>
>
> Can you put 'show proc cpu history' and what IOS you're running ? How many full-routing tables you're receiving from neighbors ?
>
>
>
>
> We have another one with multiple BGP sessions, 512MB RAM, but only a
> few actual routes. However, we are also running QoS policies on it,
> including NBAR. When aggregate throughput gets up near 100M, CPU tends
> to spike above 90%.
>
>
>
> NBAR is very CPU consuming operation.
>
>
>
> Rob
>
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