IN one customer network , it was found that ERPS was configured wrongly which causes MAC loop at ports.
Following is the check list
S.No Check Points Configuration detail
1 Ring/parented Diagram with port details
Card version & NE version- IFH2, EMS6, RTN 620, RTN950
2 Logical port status in ring Diasabled Port No.
3 Control Vlan id should be unique and different from service Vlan Id as per design
4 RPL node is in between the ring as per design Should be central node
5 RPL port
6 East & west Port Deatils
7 Port direction should be uniform in Ring Clockwise or anticlockwise
8 Hub/Spoke and East & west Port must be as per design
9 In Vlan Filtering Table Line ports must be in "available forwarding" status
10 In Split Horizon spoke will be in "selected interface"
11 In Split Horizon HUB will be in "available interface"
12 Configure ERPS
13 Enable the Logical Port to make ring through Same port as in point 2
14 Test the ERPS If test fails revert all configuration change under steps 1 to 13.
Please follow the attachment for configuration