No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>

Reminder

To have a better experience, please upgrade your IE browser.

upgrade

Interface within MP group on NE20 which is not configured ppp mp reorder caused bandwidth usability less than 3M

Publication Date:  2012-07-27 Views:  77 Downloads:  0
Issue Description
The topology is:
PDSN---NE40---MUX---AR28(NE20)---LSW---BSC
Customer planned to use a NE20 to replace AR28,adding E1 links,from 12*E1(one MP-GROUP) to 36*E1(three MP-GROUP).Before replacing,customer's bandwidth was 7M around,but after replacing,the bandwidth is less than 3M,which is much less than before.
Alarm Information
No
Handling Process
1.After we rollbacked with AR28,everything was normal,so I exclude the cause 1.
2.As before rollback,nothing was changed on BSC.Between BSC and PDSN,everything is transparently transmitted.So cause 2 is excluded.
3.Checking configuration on NE20,we found that customer configured load-balance by packet,in addition,the MP interfaces on NE20 were not 
configured ppp mp recorder function.Hence,packets were out of order during transmission,caused retransmission,and then caused the TCP rate auto-decreasing.
4.Correct the configuration on MP interfaces,enable the ppp mp recorder function,and execute the "restart" or "shutdown" and "unshutdown" command.
5.Everything was OK then. 
Root Cause
It's obvious that the packets lost,so I conclude the reason are following:
1.Transmission equipment has problem.
2.BSC has problem.
3.Configuration on NE20 has problem.
Suggestions
When you configure the ppp mp recorder function,do please execute the "restart" or "shutdown" and "unshutdown" command.Then the function will be activated.

END