report

Page 1

Mr. \ Chief of Operating and Maintenance After greetings, I’d like to preset this report to you.

Report on Internet service interruption about Maadi cabinets Problem description: The virtual tunnel between TE Bras router and TE-DATA Bras router was unstable then became down completely. At Thursday 28-3-2013 Problem details: Firstly, Tedata’s engineer (Eng. Saeed) asked us to modify the window size of the tunnel. He claimed that the tunnel size was 256 before our Bras upgrade but now become 1024. And the size mismatch between two routers causes Tunnel instability and the recommended size is 256. So we asked the vendor (Huawei) about the possibility to do that action, Then they answered us that the window size can’t be changed from Huawei Bras since there‘s no option to do that. And the temporary solution to solve the instability problem was resetting the tunnel form our side and Tedata team change the Tunnel window size to 1024 to be the same as ours. The result due to this action was the tunnel become stable for a period less than one hour and then the tunnel dropped completely between two sides and the data service was interrupted. Secondly, Tedata engineer took an action (as he said). He removed the configuration of that tunnel and reconfigures it again but the tunnel didn’t repaired too. We asked Tedata The tunnel’s name and password to insure the matching between two sides, and they replied us with this information to re-enter the password from our side. But nothing happened. So we called the vendor (Huawei) - engineer Ahmed Mahfouz to support us in this problem, then he came and took the logs and reviewed our configuration, He didn’t find something wrong in our configuration but he liked to insure completely so he sent it to the Huawei R&D in china and opened remotely link to them to enable them to review and debug all configuration about our Bras by themselves. Also they didn’t find anything wrong. But they thought that there was mismatch between two sides may be in the tunnel name or password. But we waited Tedata and their vendor (Cisco) to finish their analysis and revision.


Turn static files into dynamic content formats.

Create a flipbook
Issuu converts static files into: digital portfolios, online yearbooks, online catalogs, digital photo albums and more. Sign up and create your flipbook.