• Author : Nathan Wolfe

 
 

Lag Hashing Key Shift

Introduced in EOS-4.20.5, LAG hashing key shift controls how many bits we shift the LAG load balance key. Platform compatibility DCS-7280E DCS-7280R DCS-7280R2 DCS-7020R DCS-7500E DCS-7500R DCS-7500R2 Configuration The command to configure the LAG key shift is in the load balance profile (see https://eos.arista.com/eos-4-15-0f/lag-hashing/ for more information on how to configure load-balance profiles) 7500(config)#load-balance policies 7500(config-load-balance-policies)#load-balance sand profile p1 7500(config-sand-load-balance-profile-p1)# The key shift command is specific to LAGs 7500(config-sand-load-balance-profile-p1)#? fields Configure which headers/fields are used in the port-channel and ECMP hash packet-type Configure port-channel and ECMP hashing behavior specific to a packet type port-channel Configure port channel specific hash settings...
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LAG hashing on Ingress Interface

Introduced in EOS-4.20.5F, LAG ingress interface hashing controls whether the ingress interface is used in the LAG hashing calculation. Platform compatibility DCS-7280E DCS-7280R DCS-7280R2 DCS-7020R DCS-7500E DCS-7500R DCS-7500R2 Configuration The command to configure hashing on ingress interface is in the load balance profile (see https://eos.arista.com/eos-4-15-0f/lag-hashing/ for more information on how to configure load-balance profiles) 7500(config)#load-balance policies 7500(config-load-balance-policies)#load-balance sand profile p1 7500(config-sand-load-balance-profile-p1)# The ingress interface command is specific to LAGs 7500(config-sand-load-balance-profile-p1)#? fields Configure which headers/fields are used in the port-channel and ECMP hash packet-type Configure port-channel and ECMP hashing behavior specific to a packet type port-channel Configure port channel specific hash...
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LAG and ECMP selectable hashing fields

Introduced in EOS-4.20.1F, selectable hashing fields controls whether a certain header’s field is used in the hash calculation for LAG and ECMP. Platform compatibility DCS-7280E DCS-7280R DCS-7280R2 DCS-7020R DCS-7500E DCS-7500R DCS-7500R2 Configuration The command to configure hashing fields is in the load balance profile (see https://eos.arista.com/eos-4-15-0f/lag-hashing/ for more information on how to configure load-balance profiles) 7500(config)#load-balance policies 7500(config-load-balance-policies)#load-balance sand profile p1 7500(config-sand-load-balance-profile-p1)# The hashing field commands are applied to both LAG and ECMP. 7500(config-sand-load-balance-profile-p1)#? fields Configure which headers/fields are used in the port-channel and ECMP hash packet-type Configure port-channel and ECMP hashing behavior specific to a packet type port-channel Configure...
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Global LAG Hashing Profiles

Users can now define a global LAG hashing profile. The global LAG hashing profile will be applied to all linecards which do not have a specific LAG hashing profile assigned to them. Platform compatibility This feature is available starting in EOS 4.17.0F on 7500E and 7500R systems. Configuration The user selects a LAG hashing profile to be designated global 7500(config)#port-channel load-balance sand profile ? WORD Name of the load-balance profile 7500(config)#port-channel load-balance sand profile myGlobalProfile The ‘default’ profile is a special profile which cannot be deleted and will be set to global if no other profile is selected to be...
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