Fail in communicating with the large packets because the speed configuration of NE40 ATM interface does not match

Publication Date:  2012-07-27 Views:  61 Downloads:  0
Issue Description
Version:VRP3.10-0430
Networking:6503-NE40-CISCO7609-....
Malfunction phenomenon: on NE40, communicate with the peer ATM interface, the large packets are uncommunicated, while the small ones are communicated.

Alarm Information
On NE40 interconnects with the peer CISCO 7609 via ATM interface, the large packets are uncommunicated,while the small ones are communicated.
Handling Process
1.Check the transmission, and detect the transmission has no alarm. Access the other service via the same transmission, the other service is normal.
2.Acquire the customers and know by default, the peer CISCO device`s MTU is:4700,and the users use the default value, enlarge the MTU value on the lcoal NE40, the malfunction remains, exclude the problem of MTU value.
3.Check the ATM service configuration over two ends and detect both of them are vbr-nrt,exclude the possibility of ATM service type difference.
4.Check the ATM parameter configuration over two ends and detect the local confiugration is : service vbr-nrt 102400 102400 36;while the peer configuration is:service vbr-nrt 10240 10240 36,they are not consistent. The problem is solved after modifying.

Root Cause
1.The transmission is error.
2.The MTU values over two ends are unconsistent.
3.The ATM service type configuration over two ends are unconsistent.
4.The ATM parameter configuration over two ends are unconsistent.

Suggestions
None

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