Flex Hash And Optimized Boot-Up; Flex Hash Capability Overview - Dell C9000 Series Networking Configuration Manual

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Table of Contents

Flex Hash and Optimized Boot-Up

This chapter describes the Flex Hash and fast-boot enhancements.

Configuring the Flex Hash Mechanism

LACP Fast Switchover

Configuring LACP Fast Switchover

RDMA Over Converged Ethernet (RoCE) Overview

Sample Configurations

Preserving 802.1Q VLAN Tag Value for Lite Subinterfaces

Flex Hash Capability Overview

The flex hash functionality enables you to configure a packet search key and matches packets based on the

search key. When a packet matches the search key, two 16-bit hash fields are extracted from the start of the

L4 header and provided as inputs (bins 2 and 3) for RTAG7 hash computation. You must specify the offset of

hash fields from the start of the L4 header, which contains a flow identification field.

You can configure the system to include the fields present at the offsets that you define (from the start of the

L4 header) as a part of LAG and ECMP computation. Also, you can specify whether the IPv4 or IPv6 packets

must be operated with the Flex Hash mechanism.

Keep the following points in mind when you configure the flex hash capability:

A maximum of eight flex hash entries is supported.

A maximum of 4 bytes can be extracted from the start of the L4 header.

The offset range is 0 – 30 bytes from the start of the L4 header.

Flex hash uses the RTAG7 bins 2 and 3 (overlay bins). These bins must be enabled for flex hash to be

If you configure flex hash by using the load-balance ingress-port enable and the load-

balance flexhash commands, the show ip flow and show port-channel-flow commands are

not operational. Flex hash settings and these show commands are mutually exclusive; only one of these

capabilities can be functional at a time.

Flex Hash and Optimized Boot-Up