09-22-2010 03:00 PM - edited 03-04-2019 09:52 AM
Hi,
Have this Gig interface directly connected to a 10Mb link to the ISP.
GigabitEthernet0/0 is up, line protocol is up
Hardware is MV96340 Ethernet, address is 0025.45f2.09a0 (bia 0025.45f2.09a0)
Internet address is x.x.x.x/30
MTU 1500 bytes, BW 10000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 75/255, rxload 61/255
There's QoS configured outbound for a TCP application to provide 30% of interface bandwidth.
interface GigabitEthernet0/0
bandwidth 10000
service-policy output ARCUS-QOS
Which values do I have to see on the txload/rxload in the interface to have QoS kick in?
Class-map: TRANSACTIONAL (match-all)
23896 packets, 4597078 bytes
5 minute offered rate 12000 bps, drop rate 0 bps
Match: access-group 160
Priority: 30% (3000 kbps), burst bytes 75000, b/w exceed drops: 0
When is the interface considered congested?
Federico.
Solved! Go to Solution.
09-24-2010 11:10 AM
Hi Federico,
I don't think that's qos problem. Can you check the output of show interface stats, do you see lot process switched? Only process switched traffic will be put on input queue, I would try to find out whether this type traffic has been process switched.
Tune the buffer might also help, but I would check whether the traffic has been process switched first.
HTH,
Lei Tian
09-24-2010 11:20 AM
#sh int stats
GigabitEthernet0/0
Switching path Pkts In Chars In Pkts Out Chars Out
Processor 337000 31567901 274833 29361560
Route cache 23608968 2487058066 29071572 3694126557
Total 23945968 2518625967 29346405 3723488117
Seems there are some packets process-switched, but CEF is enabled on the interface.
I'll check the buffer link and let you know thanks.
Federico.
09-24-2010 06:26 PM
Hi Federico,
It is normal to have some traffic been process switched, like control plane traffic. The transit traffic should be cef switched unless it cannot be cef switched. For example, packet with ttl=1, packet with destination to the device, fragment packets need to be reassemble...
I think you can configure a ACL match the traffic having problem, and run debug ip packet for this ACL. The output can tell you whether this type of traffic is process switched.
Regards,
Lei Tian
09-25-2010 03:54 AM
Hi Lei,
please can you indicate a configuration example or any procedure/command (using the Control Plane Policy) to check which packets will be process switches ?
Thanks in advace
Roberto Taccon
09-25-2010 06:38 AM
Hi Roberto,
show cef not-cef-switched
(http://www.cisco.com/en/US/docs/ios/12_2/switch/command/reference/xrfscmd4.html#wp1082741)
might be a little helpfil here showing the reasons why some packets were not CEF-switched.
BR,
Milan
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: