Cisco 2621 Throughput

shakeelahmadch · ‎08-08-2005

Hi All,

i am having high cpu usgae problem with my Cisco 2621 Router. Router have 1 FE, 2 WIC2T interfaces. On the WIC, 2 of them are working as connections to ISP ( 2Mbps each) while another WIC is designated for 512Kbps VPN.

Last week while the total Ethernet (FE) traffic reaches 5.6Mbps , CPU usage reaches to 92%. The routes are static no dynamic routing is being run , only policy (source) based routing is running. Not a big load of ACL's or accounting (which is off) is on router. Please let me know what we have to fine tune or look into.

Also if someone can tell me what is the maximum throughput for cisco 2621.

Regards,

Shakeel Ahmad

paddyxdoyle · ‎08-09-2005

Policy routing can ramp up the CPU usage, are you running either CEF or route-caching for your policy map?

To check if you are running cef:

# show ip cef

To start CEF

# ip cef

To start route-caching for PBR:

# ip route-cache policy

HTH

PJD

shakeelahmadch · ‎08-09-2005

PJD,

i am already running CEF & Route-Maps to catch the HTTP request for proxying purpose, but no route-cache . If this eats up the CPU Usage, what will you sujjest in this case to catch the HTTP Request on Web Cache Servers.

Regards,

Shakeel Ahmad

v_milenko · ‎08-09-2005

Hi!

About High CPU utilization

-----------------------------

Use this link to troubleshoot:

http://www.cisco.com/en/US/products/hw/routers/ps133/products_tech_note09186a00800a70f2.shtml

About permormance Cisco 2621

------------------------------

Cisco publishes following numbers for 64 bytes packets

Cisco 262x 1500/25000 PPS (process/cef switching)

Cisco 262x(XM) 1500/30000 PPS (process/cef switching)

These numbers for router without NAT,QoS, ACL, and etc.

Good luck.

shakeelahmadch · ‎08-09-2005

here is the list of the most cpu using processes:

22 15139436 5153909 2937 0.31% 0.14% 0.15% 0 Per-Second Jobs

31 64198456 16052400 3999 0.63% 0.30% 0.30% 0 IP Input

33 15971044 913037 17492 0.00% 0.16% 0.15% 0 CDP Protocol

42 1258516 98696 12751 0.15% 0.01% 0.00% 0 IP Background

61 1359463601177214974 115 0.63% 0.70% 0.68% 0 SAA Event Proces

68 8225760 7962726 1033 0.00% 0.11% 0.09% 0 CEF process

69 32507648 158555216 205 0.23% 0.12% 0.15% 0 PPP manager

70 27285048 158557329 172 0.07% 0.16% 0.17% 0 PPP Events

Complete output is attached here.

v_milenko · ‎08-09-2005

Hi!

I see your router have about 62% total utilization, from tis value 60% utilization due to interrupts (for last 5 second) -

CPU utilization for five seconds: 62%/60%; one minute: 60%; five minutes: 61%

-----------------------------------------------------

Check show interface stat to make shure that most packets use Route cache switching path.

IMHO 62% utilization not so frightful.

Victor Milenko.

shakeelahmadch · ‎08-09-2005

victor,

i took stats on the time when there is least load, All the interfaces are using Route Cache switching path as the stats shows :

FastEthernet0/0

Switching path Pkts In Chars In Pkts Out Chars Out

Processor 11915636 1670908988 13733239 1307909060

Route cache 1052981631 2536340442 4281703820 3672308289

Total 1064897267 4207249430 469763 685250053

Serial0/0

Switching path Pkts In Chars In Pkts Out Chars Out

Processor 7504107 1047113641 51448 1185153

Route cache 1011719201 502506753 1531107947 3355389109

Total 1019223308 1549620394 1531159395 3356574262

Serial0/1

Switching path Pkts In Chars In Pkts Out Chars Out

Processor 700897 46895620 698677 46496632

Route cache 153663259 730312086 162232506 1622409306

Total 154364156 777207706 162931183 1668905938

Interface Serial0/2 is disabled

Serial0/3

Switching path Pkts In Chars In Pkts Out Chars Out

Processor 5709366 1074842795 8551700 550098911

Route cache 1485181467 1748233973 1990918411 1823205443

Total 1490890833 2823076768 1999470111 2373304354

v_milenko · ‎08-09-2005

Hi!

I see that your router use CEF switching path for packets switching. Well, if you have high router CPU utilization with CEF and almost all CPU utilization take interrupts processing,then your router reach performance limit. If you don't have any suspicious activity from your LAN (viruses) - think about router ugrade.

Victor Milenko.

shakeelahmadch · ‎08-11-2005

Hi all,

Is it possible to run route-maps and wccp on same interface for two different redirections. And if a packet comes in , what is the precedence between route-map , wccp.

michael.patton · ‎08-11-2005

the IPSec tunnels use a lot of CPU also. I assume that you added a VPN Accelerator card to your router in question? If not, then you need to and that will help a lot with your CPU issues.