Cisco N7K-C7010 Configuration Guide - Page 163

Chapter 6 Configuring Port Channels Information About Port Channels Send document comments to [email protected] You can configure the load-balancing mode to apply to all port channels that are configured on the entire device or on specified modules. The per-module configuration takes precedence over the load-balancing configuration for the entire device. You can configure one load-balancing mode for the entire device, a different mode for specified modules, and another mode for the other specified modules. You cannot configure the load-balancing method per port channel. You can configure the type of load-balancing algorithm used. You can choose the load-balancing algorithm that determines which member port to select for egress traffic by looking at the fields in the frame. Note The default load-balancing mode for Layer 3 interfaces is the source and destination IP address, and the default load-balancing mode for non-IP interfaces is the source and destination MAC address. Note You can configure the device to use one of the following methods to load balance across the port channel: • Destination MAC address • Source MAC address • Source and destination MAC address • Destination IP address • Source IP address • Source and destination IP address • Source TCP/UDP port number • Destination TCP/UDP port number • Source and destination TCP/UDP port number Non-IP and Layer 3 port channels both follow the configured load-balancing method, using the source, destination, or source and destination parameters. For example, when you configure load balancing to use the source IP address, all non-IP traffic uses the source MAC address to load balance the traffic while the Layer 3 traffic load balances the traffic using the source IP address. Similarly, when you configure the destination MAC address as the load-balancing method, all Layer 3 traffic uses the destination IP address while the non-IP traffic load balances using the destination MAC address. Note You cannot configure load balancing using port channels per VDC. You must be in the default VDC to configure this feature; if you attempt to configure this feature from another VDC, the system displays an error. You can configure load balancing either by the entire system or by specific modules, regardless of the VDC. The port-channel load-balancing is a global setting across all VDCs. If the ingress traffic is Multiprotocol Label Switching (MPLS) traffic, the software looks under the labels for the IP address on the packet. The load-balancing algorithms that use port channels do not apply to multicast traffic. Regardless of the load-balancing algorithm you have configured, multicast traffic uses the following methods for load balancing with port channels: • Multicast traffic with Layer 4 information-Source IP address, source port, destination IP address, destination port OL-23435-03 Cisco Nexus 7000 Series NX-OS Interfaces Configuration Guide, Release 5.x 6-7