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New Member

High CPU Utiilization

Iam using cat 6500 switch ,iam a transit AS. I have 10 BGP peers in that switch.

Iam receiving the routes from these ten.

I see the cpu utilization goes upto 100

i have followed the steps given in

Except the replication

Still iam facing the same problem as such my cpu utilization goes high due to BGP Scanner or BGP Router Process

Can any one help regarding this.

This is my sho ver o/p

bbr02# sh ver

Cisco Internetwork Operating System Software

IOS (tm) s72033_rp Software (s72033_rp-PK9SV-M), Version 12.2(18)SXD5, RELEASE SOFTWARE (fc3)

Technical Support:

Copyright (c) 1986-2005 by cisco Systems, Inc.

Compiled Fri 13-May-05 19:51 by ssearch

Image text-base: 0x4002100C, data-base: 0x42320000

ROM: System Bootstrap, Version 12.2(17r)S2, RELEASE SOFTWARE (fc1)

BOOTLDR: s72033_rp Software (s72033_rp-PK9SV-M), Version 12.2(18)SXD5, RELEASE SOFTWARE (fc3)

bbr02 uptime is 50 weeks, 4 days, 14 hours, 9 minutes

Time since bbr02 switched to active is 50 weeks, 4 days, 14 hours, 9 minutes

System returned to ROM by unknown reload cause - suspect boot_data[BOOT_COUNT] 0x0, BOOT_COUNT 0, BOOTDATA 19 (SP by power-on)

System image file is "disk0:/s72033-pk9sv-mz.122-18.SXD5.bin"

This product contains cryptographic features and is subject to United

States and local country laws governing import, export, transfer and

use. Delivery of Cisco cryptographic products does not imply

third-party authority to import, export, distribute or use encryption.

Importers, exporters, distributors and users are responsible for

compliance with U.S. and local country laws. By using this product you

agree to comply with applicable laws and regulations. If you are unable

to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:

If you require further assistance please contact us by sending email to

cisco WS-C6506 (R7000) processor (revision 3.0) with 983008K/65536K bytes of memory.

Processor board ID TSC070600KH

SR71000 CPU at 600Mhz, Implementation 0x504, Rev 1.2, 512KB L2 Cache

Last reset from power-on

X.25 software, Version 3.0.0.

Bridging software.

1 FlexWAN controller (1 POS).

4 Ethernet/IEEE 802.3 interface(s)

38 Virtual Ethernet/IEEE 802.3 interface(s)

18 Gigabit Ethernet/IEEE 802.3 interface(s)

4 Gigabit Ethernet/IEEE 802.3 interface(s)

1 Packet over SONET network interface(s)

1917K bytes of non-volatile configuration memory.

8192K bytes of packet buffer memory.

65536K bytes of Flash internal SIMM (Sector size 512K).

Configuration register is 0x10F



  • WAN Routing and Switching

Re: High CPU Utiilization

Hello Ranga,

there could be various causes for your problem. Have a look at the document below, which might cover your issue, and which provides troubleshooting techniques:

Troubleshooting High CPU Caused by the BGP Scanner or BGP Router Process



Re: High CPU Utiilization

My apologies, my link is the exact same document you have already mentioned in your post...


New Member

Re: High CPU Utiilization


I have almost tried all these trouble shooting stpes given in

excpet replication.

Iam almost receiving 526375 prefixes from all the BGP peers.

can any one help me out to resolve this issue.

Can my swicth handle this amount of prefixes.



Re: High CPU Utiilization

Hi Ranga,

please check your 'sh proc cpu sorted' and post your output.



New Member

Re: High CPU Utiilization

hi, here is the sh process cpu sorted output

bbr02#sh processes cpu sorted

CPU utilization for five seconds: 97%/4%; one minute: 65%; five minutes: 55%

PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process

269 1352054504 10154212 133155 64.65% 7.79% 5.38% 0 BGP Scanner

267 17068362481470785672 1160 24.80% 42.62% 36.06% 0 BGP Router

138 59642644 516954 115375 2.16% 0.26% 0.17% 0 IP Background

268 5204498441482536784 351 1.08% 5.82% 5.63% 0 BGP I/O

111 4289921481921074252 223 0.92% 3.01% 2.94% 0 IP Input

35 9941800 1171664 8485 0.38% 0.04% 0.00% 0 Per-minute Jobs

281 13340 13250 1006 0.23% 0.02% 0.14% 3 SSH Process

141 10849340 48158206 225 0.15% 0.05% 0.05% 0 CEF process




Re: High CPU Utiilization

well, the right point to investigate is your BGP.

we need more infos, about topology and confs.

Let me know



New Member

Re: High CPU Utiilization

Hi andrea,

this swicth is connected to another 6500 switch.

this this swicth we have 10 BGP Sessions and 15 customer Link out of 15, 5 has BGP sessions with us.

in another cat 6506 swicth we have only 5 customer Link.

Do u require thw whole BGP config ?

One doubt is that Does My switch has the capacity to handle so much Prefixes



New Member

Re: High CPU Utiilization


Can any one give me a solution for this issue.




Re: High CPU Utiilization

Hi Ranga,

for my experience, 526375 prefixes are impressive.

Have you a IGP-BGP redistribution on your network?



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