Instead of statically assigning access VLAN on the authenticator port, it's sometimes desirable to offload the work

MAC Based Authentication is a facility which allows a set of MAC addresses to be programmed into the RADIUS server.

This feature allows the DHCP relay agent to insert or modify Converged Cable Access Platform (CCAP) Core IPv6

Filtered Mirroring allows certain packets to be selected for mirroring, rather than all packets ingressing or egressing a particular port.

EOS's architecture is built around the notion of agents. While the CLI show commands offer great insights into the

This features enables ARPs learnt on an SVI interface to be converted into Host routes which can further be

In EOS 4.20.5F, Autonegotiation is supported on 7160 series. This feature provides IEEE802.3 Clause73

BFD Stateful Switchover (SSO) allows for a switchover from an active supervisor to a standby supervisor where BFD

Community Instances offer a method of selecting BGP routes based on count of communities in the communities path

This feature adds support for BGP peering over IPv6 link local addresses. As defined in RFC 4007, IPv6 addresses have

This feature implements RFC3107 that allows carrying a label stack with BGP route updates, using multi protocol BGP.

"Block frames not matching any vlan mappings on trunk port" is a new feature that has been added in 4.20.5 release. When

"Block Untagged Frames on Dot1Q Tunnel port" is a new feature that has been added in this release. When this feature is


This feature will provide a common encryption key to be used across all protocols to encrypt the neighbor password

By default, counters are polled from hardware every 2 seconds. This enhancement allows this period to be configured,

Starting from EOS 4.20.5F, power supply low input voltage warning can be configured via a CLI command. Prior to the

EOS 4.20.5F introduces dedicated FEC (Forwarding Equivalence Class) per BGP next hop. This feature will ensure

In VXLAN EVPN deployments, a distributed anycast address is often used as the gateway address for end devices connected to the Vxlan Tunnel End Points (VTEPs). Similarly, in MLAG configurations in a VXLAN environment, ip address virtual could be used on both MLAG peers.

DirectFlow is a feature that allows the user to steer traffic by matching on packet headers and/or metadata using the

EOS 4.20.5F introduces support for disabling local interface, when a fault is signaled by the remote peer. The

Source port filtering is enabled by default due to which packets are not allowed to egress on the same interface they

Ethernet VPN (EVPN) is an extension of the BGP protocol introducing a new address family: L2VPN (address family

This feature allows the possibility to enable/disable the hardware watchdog. By default the hardware watchdog is

EOS 4.20.5F adds support for hardware accelerated sFlow on compatible platforms. Without hardware acceleration,

Previously, EOS only supported the two step variation of the transparent clock as described in the IEEE 1588

This feature provides support for per interface ingress packet and byte counters for both IPv4 and IPv6.

The route map feature 'invert result' has been added to the 'match community' and 'match extcommunity' statements

Similar to L4 ports, ACL rules can be configured to filter ingress packets based on their IP length (present in the IPv4

IS-IS Counters feature adds support to monitor per interface count of received, transmitted and dropped IS-IS PDUs at the Rib/ISIS agent level. The counters start getting incremented once IS-IS is enabled on an interface and persist until IS-IS is disabled on it or the Rib/Isis agent restart.

The partial SPF computation avoids a full shortest path computation to achieve quicker convergence and save CPU load

Segment Routing provides mechanism to define end-to-end paths within a topology by encoding paths as sequences of sub-paths or instructions. These sub-paths or instructions are referred to as “segments”. IS-IS Segment Routing (henceforth referred to as IS-IS SR) provides means to advertise such segments through IS-IS protocol.

This feature allows a user to configure adjacency SID for IS IS adjacencies so that we have deterministic values of

This document describes two features that allow dynamic metric change for IS IS based on interface speed.

Traffic Engineering (TE) provides a mechanism to network administrators to control the path that a data packet takes, bypassing the standard routing model which uses routes along the shortest path. Traffic engineered paths are generally computed on the head-end routers of the topology based on various constraints (e.g. minimum bandwidth, affinity) configured for those paths and attributes (e.g available bandwidth, color) received from devices in the network topology. 

The L2EVPN MPLS feature is available when configuring BGP in the multi agent routing protocol model.

The L2EVPN MPLS feature is available when configuring BGP in the multi agent routing protocol model. Ethernet VPN

Introduced in EOS-4.20.1F, “selectable hashing fields” feature controls whether a certain header’s field is used in the hash calculation for LAG and ECMP.

Introduced in EOS 4.20.5, LAG hashing key shift controls how many bits we shift the LAG load balance key.

Introduced in EOS 4.20.5F, LAG ingress interface hashing controls whether the ingress interface is used in the LAG

LANZ adds support for configuring global thresholds for Ethernet ports on DCS 7020, DCS 7050TX, DCS 7050X2, DCS

Link Fault Signalling (LFS) is a mechanism by which remote link faults are asserted over a link experiencing

The management tech support policy provides the capability to efficiently manage the output of "show tech support"

MLAG Smart System Upgrade (SSU) provides the ability to upgrade the EOS image of an MLAG switch with minimal traffic

As of release 4.20.5F, this feature is now available on 7160 series switches. Here is a link to earlier

This feature provides per label ingress packet and byte counters for MPLS routed packets. DCS

The EOS Event Handler feature provides the ability to specify a condition and an action to be carried out when that

This document provides an Arista specific solution to deliver multicast traffic in a Vxlan environment where L2

The EOS Event Handler feature provides the ability to specify a condition and an action to be carried out when that

The SNMP notifications (Trap and Inform messages) that were most recently sent are recorded in a log, as described by

These are the release notes and configuration guide for the OpenConfig feature available in the 4.20.5F EOS release.