Dual Homing Ring Splitting

The objective of this feature is to make nodes free from the ring and the user is expected to know the nodes which have to be targeted to free up bandwidth.

Pre-requisites

1. The nodes G and J should have two ports each which are free from cross connects to include these for Augmentation.
2. The two free ports on each node which are augmented should be of the same rate as that of its corresponding ports.
3. From the point of view of the example considered here, if the user decides to delete or remove the nodes H and I from the circuit, then the adjacent nodes G and J respectively have to be considered for Node Augmentation.

Performing Dual Homing Ring Splitting

1. The circuit created in graphical view is as follows:

   

2. The ring can be split by deleting the trunk between the nodes C and D. Switch the traffic to protect path, A->G->H->I->J->F before deleting the trunk.
3. To split the ring, two fresh ports have to be selected on the node G say, ports 1-2-2 and 1-2-3 and on the node J say, ports 1-4-2 and 1-4-3.
4. Switch the traffic to the protect path as mentioned above. If the ring had to be split on the protect path and if the traffic is on the work path, then traffic need not be switched.
5. Now, provide connection between the fresh ports selected on node J and the ports on which the trunk was deleted i.e., connect port 1-3-1 of node C to the fresh port 1-4-3 of node J and connect port 1-5-1 of node D to the fresh port 1-4-4 (temporarily used port) of node J as shown in the following figure:

   

   NOTE: On node J, port 1-4-3 is taken as East port and port 1-4-4 is taken as West port.

6. Perform Node Augmentation on the node J, between the East port (1-4-3) and the west port (1-4-4) from NMS Topology View (Network View—Nodes). Select the node J and click Augment Node. Refer section Node Augmentation. Augment Node window will pop-up, select East and West ports as a pair.

   

7. Click Augment Node.
8. Verify that pass through cross-connects are created between ports 1-4-3 and 1-4-4 of node J.
9. After the node augmentation is done, delete the trunk between nodes D and J i.e., the trunk between the temporary port 1-4-4 and 1-5-1.
10. Make the connection as shown in the following figure:

    

    NOTE: On node G, port 1-2-3 is taken as East port and port 1-2-4 is taken as West port.

11. As shown in the figure above, connect the ports 1-2-4 and 1-4-4 of nodes G and J.
12. Connect the port 1-5-1 of node D and port 1-2-3 of node G.
13. Perform Node Augmentation on the node G, between the East port (1-2-3) and the West port (1-2-4) from NMS Topology View (Network View—Nodes). Select the node G and click Augment Node. Augment Node window will pop-up, select East and West ports as a pair.

    

14. Click Augment Node.
15. Verify the graphical view of the circuit, the altered graphical view shows the work path as A->B->C->J->G->D->E->F and the protect path as A->G->H->I->J->F.
16. The circuit can be edited by deleting the trunk between port 1-2-4 on node G and port 1-4-4 on node J and make the work path as A->B->C->J->F and the protect path as A->G->D->E->F. Refer Edit Circuits.
17. The nodes H and I can be deleted from the circuit, thus there would be loss in traffic till the circuit is edited. The final circuit would be as shown in the following two figures:

    

    

NOTE 1: Splitting of MSSP ring and MSP ring is not supported.

NOTE 2: After performing augmentation, while editing circuit, the loops present in the circuit must be removed.