[c-nsp] How many maximum routes does Cisco 2900 router support?

[Adam Greene]

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.

 

 

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  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)

 

 

 

 

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      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%

 

 

 

 

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      191636072355596196889533814797459604133697199750512606592244123647545774

  100           * **  *   *       *   *           *          *          *

   90    *      * **  **  ***     *   **  * *     *          *          * ***

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   70 ** * * * **************** ********************* ** ** ***   ** * *******

   60 ************************* ******************************* **************

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   30 ##*******################**#****#*###############*********##############

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     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