Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 372

When load balancing RRoCE packets using flex hash is enabled, the show ip flow command is disabled. Similarly, when the show ip flow command is in use (ingress port-based load balancing is disabled), the hashing of RRoCE packets is disabled. Flex hash APIs do not mask out unwanted byte values after extraction of the data from the Layer 4 headers for the offset value. 2 Use the load-balance flexhash command to specify whether IPv4 or IPv6 packets must be subjected to the flex hash functionality, a unique protocol number, the offset of hash fields from the start of the L4 header to be used for hash calculation, and a meaningful description to associate the protocol number with the name. CONFIGURATION mode Dell(conf)# load-balance flexhash ipv4/ipv6 ip-proto offset1 [offset2 ] To delete the configured flex hash setting, use the no version of the command. LACP Fast Switchover LACP Fast Switchover causes the physical ports to be aggregated faster when configured in a port-channel on both the nodes that are members of a port-channel. When LACP 'fast-switchover' is enabled on the system, two optimizations are performed to the LACP behavior: • The wait-while timer is not started in the 'waiting' state of the MUX state machine. The port moves directly to the 'attached' state. • The local system moves to the 'collecting' and 'distributing' states on the port in a single step without waiting for the partner to set the 'collecting' bit. Configuring LACP Fast Switchover To configure the optimized booting time functionality, perform the following step: • The lacp fast-switchover command applies to dynamic port-channel interfaces only. When applied on a static portchannel, this command has no effect. If you configure the optimized booting-time capability and perform a reload of the system, the LACP application sends PDUs across all the active LACP links immediately. INTERFACE (conf-if-po-number) mode Dell(conf-if-po-number)#lacp fast-switchover LACP LACP Fast Switchover When LACP 'fast-switchover' is enabled on the system, two optimizations are performed to the LACP behavior: • The wait-while timer is not started in the 'waiting' state of the MUX state machine. The port moves directly to the 'attached' state. • The local system moves to the 'collecting' and 'distributing' states on the port in a single step without waiting for the partner to set the 'collecting' bit. RDMA Over Converged Ethernet (RoCE) Overview Remote direct memory access (RDMA) is a technology that a virtual machine (VM) uses to directly transfer information to the memory of another VM, thus enabling VMs to be connected to storage networks. With RDMA over converged Ethernet (RoCE), RDMA enables data to be forwarded without passing through the CPU and the main memory path of TCP/IP. In a deployment that contains both the RoCE network and the normal IP network on two different networks, routable RoCE (RRoCE) combines Flex Hash and Optimized Boot-Up 372