Administrator Guide

When load balancing RRoCE packets using ex 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 oset value.
2 Use the load-balance flexhash command to specify whether IPv4 or IPv6 packets must be subjected to the ex hash
functionality, a unique protocol number, the oset of hash elds 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 <protocol number> <description string>
offset1 <offset1 value> [offset2 <offset2 value>]
To delete the congured ex hash setting, use the no version of the command.
LACP Fast Switchover
LACP Fast Switchover causes the physical ports to be aggregated faster when congured 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.
Conguring LACP Fast Switchover
To congure 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 port-channel, this
command has no eect. If you congure 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 dierent networks, routable RoCE (RRoCE) combines the RoCE and the IP networks and
sends the RoCE frames over the IP network. RRoCE transmission results in the encapsulation of RoCE packets in IP packets.
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Flex Hash and Optimized Boot-Up