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

interconnection analysis between Cisco router and OSN SSN1PEG8

Publication Date:  2012-07-25 Views:  54 Downloads:  0
Issue Description
Customer reported: Huawei OSN 7500 is interconnected with Cisco Router by SSN1PEG8 board.For Huawei side, SSN1PEG8 worked with 1000MFULL, Cisco work mode is reported to set as 1000MFULL. When the  Cisco  Router is of outage(Shutdown), and up again, then Cisco port reported LinkDown. After customer modified the Cisco work mode to Auto Negotiate, the Cisco port is normal again.
Customer doubted: the OSN work mode for SSN1PEG8 is abnormal, which affected  the Cisco Router port Linkup.


Alarm Information
ETH-LINK DOWN


Handling Process
unify the work mode for both Huawei and Cisco to  1000 MFull or Auto for such interconnection scene.  And  1000 MFull  is better.

Root Cause
By the logs of Cisco router, we found that the port state of  Cisco router is always AUTO Negotiate ,instead of  1000MFULL as the customer declared.We simulated the interconnection scene of OSN equipment and Cisco equipment in lab.  And change effects of the work mode were also studied on other scene. The testing results are listed in the following table. So if OSN state is 1000MFull and Cisco state is Shutdown, then both of them will LINK Down.

  OSN Cisco Negotiate Result
Step 1 AUTO Negotiate AUTO Negotiate OSN:LINK UP
Cisco: LINK UP
Step 2 Change to 1000MFull AUTO Negotiate OSN:LINK UP
Cisco: LINK UP
Step 3 1000 MFull Shutdown OSN:LINK Down
Cisco: Link Down
Step 4 1000 MFull Shutup OSN:LinkUp
Cisco:LinkDown
Step 5 Change to AUTO Negotiate AUTO Negotiate OSN:LinkUp
Cisco:LinkUp

Suggestions
Meanwhile, we also tested the interconnection of two same Cisco Routers, which was same as the above testing.
  Cisco76-2(2/1) Cisco76-2(2/1) Negotiate Result
Step 1 AUTO Negotiate AUTO Negotiate Cisco76-2(2/1):LINK UP
Cisco76-2(2/3): LINK UP
Step 2 Change to 1000MFull AUTO Negotiate Cisco76-2(2/1):LINK UP
Cisco76-2(2/3): LINK UP
Step 3 1000 MFull Shutdown Cisco76-2(2/1):LINK Down
Cisco76-2(2/3): Link Down
Step 4 1000 MFull Shutup Cisco76-2(2/1):LinkUp
Cisco76-2(2/3):LinkDown
Step 5 Change to AUTO Negotiate AUTO Negotiate Cisco76-2(2/1):LinkUp
Cisco76-2(2/3):LinkUp



END