• Author : Greg Poloczek

 
 

Disable ingress interface from LAG hashing

Description In older EOS releases the ingress interface was always included in LAG hash calculations input together with other currently configured fields, for instance source/destination MAC addresses, source/destination IP addresses and or L4 ports, etc. A new CLI was added to control the inclusion of the ingress interface to the LAG hash.  Having an ingress interface as one of the inputs to LAG hash calculation ensures that the same flows of packets (identified by a unique set of selected packet fields) will be transmitted out of different members of a LAG. There may be a need to disable this behavior,...
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LAG/ECMP hashing on TTL/Hop Limit

Arista switches use the hashing algorithm to load balance traffic among LAG (Link Aggregation Group) members and among L3 ECMP (equal cost multipath) paths. In case of IP/IPV6 traffic, the hashing algorithm may include (if so configured for LAG) the typical IP packet fields such as source/destination IP address(es) as well as source/destination port(s) for UDP/TCP traffic. In order to improve traffic distribution for IPV4/IPV6 traffic, IPV4/TTL and IPV6/HopLimit fields have been added to the hashing algorithm for both LAG and ECMP starting EOS release 4.15.2F for the supported platforms listed below. Platform compatibility DCS-7300X series DCS-7050X series DCS-7250QX Configuration A new CLI for setting the TTL/Hop...
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IPv6 flow label hashing for LAG/ECMP

Arista switches use the hashing algorithm to load balance traffic among LAG (Link Aggregation Group) members and among L3 ECMP (equal cost multipath) paths. In case of IP/IPV6 traffic, the hashing algorithm may include (if so configured for LAG) the typical IP packet fields such as source/destination IP address(es) as well as source/destination port(s) for UDP/TCP traffic. In order to improve traffic distribution for IPV6 traffic, IPV6 Flow Label field has been added to the hashing algorithm for both LAG and ECMP. Configuration There is no configuration available for IPV6 Flow Label inclusion in the hashing algorithm – the feature is always enabled. Limitations IPV6 Flow Label will...
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