Dell C1048P Port Extender Networking Command-Line Reference Guide for the C900 - Page 881

Usage Information With the introduction of various overlay technologies such as network virtualization using generic routing encapsulation (NVGRE) segments and Routable Remote Direct Memory Access (RRDMA) over Converged Ethernet (RRoCE), information related to a traffic flow is contained in the L4 header. The fields in the L2 and L3 headers are not sufficient to distinguish the flows. Therefore, the fields in the L4 header are processed when hashing is performed for packets over LAG and ECMP links. 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 cause 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. Example Dell(conf)# load-balance flexhash ipv4 ip-proto 1 desc offset1 1 offset2 2 load-balance ingress-port enable Enable the Flex hash functionality. This utility is supported on the C9000 platform. Syntax load-balance ingress-port enable To disable the Flex hash capability, use the no version of this command. Default None Command Modes CONFIGURATION mode Command History This guide is platform-specific. For command information about other platforms, refer to the relevant Dell Networking OS Command Reference Guide. The following is a list of the Dell Networking OS version history for this command. Version 9.9.(0.0) 9.3(0.0) Description Introduced on the C9010. Introduced on the S6000 platform. Usage Information Flex hash uses the RTAG7 bins 2 and 3 (overlay bins). These bins must be enabled for Flex hash to be configured. These bins contain the source module and source port information. These bins are disabled by default in releases of Dell Networking OS earlier than Release 9.3.0.0. The default behavior of disabling of these bins occurs because of incorrect egress port information that would otherwise be displayed in the output of the diagnostic show command of show ip flow. Flex Hash and Optimized Boot-Up 881