Add instructions for creating custom VM crossconnect
Change-Id: Ib94434e72c1ee08a9b6dba08e19ec470f981a750
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# AGG Switch Operations
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+The aggregation switch is managed by the [Fabric Crossconnect](/fabric-crossconnect/README.md) Service.
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+## Creating special-purpose VLAN crossconnects
+
+Sometimes it is necessary to create a special purpose VLAN crossconnect, such as to connect a specific VM to a BNG. To do this, it is necessary to manually create a `FabricCrossconnectServiceInstance`. First, assure that you have the necessary information:
+
+- `s_tag`. The VLAN tag that you wish to crossconnect.
+- `source_port`. Port number on the switch for one end of the crossconnect (typically where your VM is attached).
+- `destination_port`. Port number on the switch for the other end of the crossconnect (typically where your BNG is attached).
+- `switch_datapath_id`. Openflow ID of the switch where the crossconnect should be created.
+
+Next, navigate using the GUI to `Fabric crossconnect -> Fabric Crossconnect Service Instances`. There may or may not be existing service instances in the table at this time. Regardless, press the `Add` button to add a new service instance for your crossconnect:
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+
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+You will be presented with an empty detail screen for a new `Fabric Crossconnect Service Instance`. Enter the `s_tag`, `source_port`, and `switch_datapath_id`, then press the `SAVE` button.
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+
+
+If you already have a BNGPortMapping that matches the s-tag, then you do not need to proceed any further. If not, then it will be necessary to create a new BNGPortMapping for your s-tag. Start by going to `Fabric crossconnect -> BNGPortMappings`. There may or may not be any existing port mappings in the table. Press the `Add` button to create a new BNGPortMapping.
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+
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+You will be presented with an empty detail screen for a new `BNG Port Mapping`. Enter the `s_tag` and `switch port` (destination port), and then press the `SAVE` button.
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+
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