Help correct errors in emails, make it more official 1. Dear customer, We have completed the investigation on both of the SVR-02 and TCR-02 routers, but there is no fault found with the routers, the ports and the MPLS links, our local supplier confirmed the link remains up for weeks as well. But we found that there are error log related to the LAN port from 21st to 24th May, indicating the LAN ports were flapping in the past few days. We suspect that the LAN switch is faulty or there’s a single point failure on the Ethernet link within LAN connection, which are not managed by BT and our supplier. We noticed that since 24th May, there has been clear on the system log of CE router, so have you changed anything at your site? Are the sw1 and sw2 are stacked together? Is the port g1/1/35 on sw2 checked?(Because I noted the OPFS was impacted by this port flapping.) 2. Dear customer, Please refer to below email first. Additionally although BT don’t manage your LAN, but we still want to cooperate with you to figure out the line flapping reason, due to invisible to your LAN set up, we suggest you to check the SPT and OPSF type if they are implemented in your LAN network, because even one link is faulty can cause the dual links flapping. We also noticed the G1/1/35 on sw2 was down, has this port been checked? If it’s possible please share your network topology for further diagnostic. Thanks & Regards,