You must install an N7K-M series module in the Cisco Nexus 7000 Series chassis to run Layer 3 routing and multicasting with the N7K-F132-15 module because you must have interfaces from both the M Series and the N7K-F132-15 modules in the same virtual device context (VDC). See theCisco Nexus 7000 Series Virtual Device Context Configuration Guide for more information on VDCs.
Layer 3 routing and multicasting come up automatically when you have an N7K-M series module installed in the chassis with the N7K-F132-15 module. You can position a chassis with both N7K-F132-15 and M Series modules at the boundary between the Layer 2 and Layer 3 networks.
You must configure a VLAN interface for each VLAN on the N7K-F132-15 module that you want to use the proxy-routing functionality in a chassis that contains both N7K-F132-15 and M series modules. See the Cisco Nexus 7000 Series Interfaces Configuration Guide for information on configuring VLAN interfaces.
By default, all of the physical interfaces on the N7K-M series modules in the VDC become proxy routing ports for the VLANs that are configured with VLAN interfaces on the Layer 2-only N7K-F132-15 module in the same VDC. The physical interfaces on the M Series module can be administratively down and they still pass traffic as proxy routers.
Packets that enter an interface on the N7K-F132-15 module are automatically forwarded to one of the interfaces on the M Series modules in the same VDC to be routed. The interface on the M Series module also performs egress replication for Layer 3 multicast packets that enter an interface on the N7K-F132-15 module in the same VDC. See the Cisco Nexus 7000 Series NX-OS Unicast Routing Configuration Guide for additional information about the routing interoperation with the N7K-F132-15 module.
You can specify which interfaces on the M Series modules in the VDC where you want to perform the egress replication of VLAN interfaces for Layer 3 multicast packets. For multicast egress replication, the system automatically rebalances all the VLAN interfaces among all the available M Series proxy routing interfaces. You can specify automatic or manual rebalancing among the proxy multicast replicators. If you specify manual rebalancing, you trigger a rebalance by entering a command. This command is useful when you are inserting or removing modules.
When you configure manual egress multicast replication load balancing and enter the rebalancing command, that command is not part of the configuration. It is not included in the commands that are copied when you enter the copy running-config startup-config command.