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AR2240 CPU Slave Core Usage High Issue Analyze Case Sharing

Latest reply: Dec 29, 2018 03:30:03 449 3 8 0 0

1、Device Information:AR2240 V200R005C20SPC200

2、Problem Description:AR2240 slave core CPU Usage high for long time,the device receive huge data steam on the interface and exceed the router performance.

3、Problem Analysis:


1)Interface bandwidth usage exceed 500M

During the problem happened, interface bandwidth usage on GE2/0/0 has exceed 500M, interface gts is configured for 500M, and the exceed data steam will be dropped.

Input peak rate 503386064 bits/sec,Record time: XX

Output peak rate 495284592 bits/sec,Record time: XX


2)IP fast forwarding table number exceed the limit


[SEP-INTERNET-MAIN-VIADUCTO]display ip fast-forwarding table number

Ipv4 FastForward Table Number: 351889

[SEP-INTERNET-MAIN-VIADUCTO]display ip fast-forwarding table number

Ipv4 FastForward Table Number: 351890


Limit for ip fast forwarding table on AR2240 is 400K, on the time we remote, which most service is not online because it is off work time. But fast forwarding table is 350K, so when on the work time it will exceed the limit.
When exceed the fast forwarding table is exceeded the limit, the cpu usage will be high in a short time because router exceed the router performance.

3)Session table exceed the limit

Same time on previous chapter, R&D also found session table number is reaching the limit.


<SEP-INTERNET-MAIN-VIADUCTO>disp sess nu

  The total number of session tables is: 313590


Session table number limit is also 400K, on the time we remote, which most server is not online because it is off work time. But session table is 350K, so when on the work time it will exceed the limit.
When exceed the session exceed the limit, new data steam will be dropped because router cannot establish the session table. And session establishment and delete will cause cpu-usage high.


4、Root Cause and Solution

Customer network service has exceed AR2240 router performance.
Solution is replace AR2240 with high performance router, such as NE router.

This post was last edited by w1 at 2018-12-28 03:43.
  • x
  • convention:

yjhd
Created Dec 28, 2018 03:47:12

Session table number limit is also 400K, on the time we remote, which most server is not online because it is off work time. But session table is 350K, so when on the work time it will exceed the limit.
When exceed the session exceed the limit, new data steam will be dropped because router cannot establish the session table. And session establishment and delete will cause cpu-usage high.
View more
  • x
  • convention:

yjhd
Created Dec 29, 2018 02:08:03

Limit for ip fast forwarding table on AR2240 is 400K, on the time we remote, which most service is not online because it is off work time. But fast forwarding table is 350K, so when on the work time it will exceed the limit.
When exceed the fast forwarding table is exceeded the limit, the cpu usage will be high in a short time because router exceed the router performance.



3)Session table exceed the limit

Same time on previous chapter, R&D also found session table number is reaching the limit.
View more
  • x
  • convention:

Finn92
Created Dec 29, 2018 03:30:03

Limit for ip fast forwarding table on AR2240 is 400K, on the time we remote, which most service is not online because it is off work time. But fast forwarding table is 350K, so when on the work time it will exceed the limit.
When exceed the fast forwarding table is exceeded the limit, the cpu usage will be high in a short time because router exceed the router performance.
View more
  • x
  • convention:

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