Cisco 877 throughput and process
Hi guys,
We have a site which recently got upgraded to a 40/40 Mbps bonded DSL connection.
The bottleneck, which I feel are two Cisco 877M's have not been upgraded to better routers. These routers currently run interface tracking and are setup for HSRP, in case the new 40/40 connection goes down we have a backup connection there.
My questions are two-fold. Firstly, would a SOHO router like 877 be able to fully utilize this 40/40 connection? The datasheet says the 877 can handle 25,000 pps. With a minimum 64 byte packet with header that translates to 16Mbps throughput. Considering that most of the interesting traffic is HTTP, FTP and as such I would assume this throughput to go up.
But our NMS shows a maximum throughput of around 20Mbps during heavy usage. Is there a reason this router cannot go higher? Or is it hardware limited.
Secondly, the router has a an average CPU usage of over 60% and frequently going over 80% usage. Is this a cause for concern at all with this router?
Thank you
We have a site which recently got upgraded to a 40/40 Mbps bonded DSL connection.
The bottleneck, which I feel are two Cisco 877M's have not been upgraded to better routers. These routers currently run interface tracking and are setup for HSRP, in case the new 40/40 connection goes down we have a backup connection there.
My questions are two-fold. Firstly, would a SOHO router like 877 be able to fully utilize this 40/40 connection? The datasheet says the 877 can handle 25,000 pps. With a minimum 64 byte packet with header that translates to 16Mbps throughput. Considering that most of the interesting traffic is HTTP, FTP and as such I would assume this throughput to go up.
But our NMS shows a maximum throughput of around 20Mbps during heavy usage. Is there a reason this router cannot go higher? Or is it hardware limited.
Secondly, the router has a an average CPU usage of over 60% and frequently going over 80% usage. Is this a cause for concern at all with this router?
Thank you
ASKER
Thanks joseleonardo, this is an Ethernet over Copper connection terminated at a NTU, it is a 40/40 connection.
ip cef is enabled, sh proc cpu output shows:
88757894331231547676776688
52999305137895764059414332
100
90 * * * * * *
80 *** *** * **** **** ******* ** * ***
70 *** *** * **** ******* **** ******** ** *****
60 ******* * **************** * *************** **** *****
50 ******** ****************** * *******#********* * **********
40 ******** * ******************* ** ********#*#******* * * ********##
30 *#******** ** *******#******************
20 ##***************#########
10 ####**********############
0....5....1....1....2....2
0 5 0 5 0 5 0 5 0 5 0 5 0
CPU% per hour (last 72 hours)
* = maximum CPU% # = average CPU%
There is a single access list, no CBAC enabled, and the router is doing NAT.
To test the throughput for an extended time, would FTP utilize the 40/40 connection?
ip cef is enabled, sh proc cpu output shows:
88757894331231547676776688
52999305137895764059414332
100
90 * * * * * *
80 *** *** * **** **** ******* ** * ***
70 *** *** * **** ******* **** ******** ** *****
60 ******* * **************** * *************** **** *****
50 ******** ****************** * *******#********* * **********
40 ******** * ******************* ** ********#*#******* * * ********##
30 *#******** ** *******#******************
20 ##***************#########
10 ####**********############
0....5....1....1....2....2
0 5 0 5 0 5 0 5 0 5 0 5 0
CPU% per hour (last 72 hours)
* = maximum CPU% # = average CPU%
There is a single access list, no CBAC enabled, and the router is doing NAT.
To test the throughput for an extended time, would FTP utilize the 40/40 connection?
The throughput never goes to take the exactly 40/40 because the encapsulation and protocol payload, since the data transfer in an FastEthernet environment is almost 13Mbits in your conexion it would be like 4Mbps.
On the other hand, Your CPU seems to be very high, please issue " show proccess cpu" without "history" in order to see what is the proccess with the higher percent.
On the other hand, Your CPU seems to be very high, please issue " show proccess cpu" without "history" in order to see what is the proccess with the higher percent.
ASKER
It seems to be all normal, with the only processes worth noting being:
75 31201069 13699448 2277 2.53% 3.62% 3.87% 0 IP Input
4 5404659 291736 18525 0.00% 0.89% 0.82% 0 Check heaps
I was expecting around 38Mbits atleast, which I do get on burst speeds and not as a constant throughput,
75 31201069 13699448 2277 2.53% 3.62% 3.87% 0 IP Input
4 5404659 291736 18525 0.00% 0.89% 0.82% 0 Check heaps
I was expecting around 38Mbits atleast, which I do get on burst speeds and not as a constant throughput,
Ok, This Link Could help you with the troubleshooting with High CPU
http://www.cisco.com/en/US/products/hw/routers/ps359/products_tech_note09186a00801c2af3.shtml#ip_input
If there's not problem with bugs on your router could be that your IOS Version have a Bug.
http://www.cisco.com/en/US/products/hw/routers/ps359/products_tech_note09186a00801c2af3.shtml#ip_input
If there's not problem with bugs on your router could be that your IOS Version have a Bug.
Hey How has you going with this issue?
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The ADSL2+ standard (ITU G.992.5) doubles the bandwidth used for downstream data transmission, effectively doubling the maximum downstream data rates, and achieving downstream data rates of up to 24 Mbps and upstream data rates of up to 1.5 Mbps.
Secondly, for the cpu utilization could be many things:
1 - have you enabled IP CEF?
2- the router is overloaded, cisco recommend to change the equipment that have CPU over 40 percent of utilization. Could you put the followigs output commands?
show proc cpu
show proc cpu history
show running-config
Regards