- Written by Tarun Jaswanth LNU
- Posted on 8月 24, 2020
- Updated on 5月 13, 2025
- 31210 Views
802.1X is an IEEE standard protocol that prevents unauthorized devices from gaining access to the network.
- Written by Himanshu Singh
- Posted on 4月 25, 2025
- Updated on 4月 25, 2025
- 446 Views
Automatic certificate management provides support for retrieving signed x509v3 certificates from a server under the Enrollment over Secure Transport (EST) protocol, described in RFC 7030. The feature provides only EST client capabilities.
- Written by Jason Shamberger
- Posted on 3月 11, 2020
- Updated on 5月 5, 2025
- 19083 Views
EOS 4.21.3F introduces support for BGP Flowspec, as defined in RFC5575 and RFC7674. The typical use case is to filter or redirect DDoS traffic on edge routers.
- Written by Yaonan Liang
- Posted on 4月 30, 2025
- Updated on 4月 30, 2025
- 405 Views
Peer Tagging Route Filtering feature discards BGP route advertisements by the peers which the routes are received from. The feature lets users assign a peer-tag to a peer or a group of peers in inbound direction and discard routes advertisements by the peer-tag in outbound direction. One use case of the feature is to discard AS loop routes in outbound direction in data center deployments.
- Written by Bhavin Patel
- Posted on 3月 24, 2020
- Updated on 5月 14, 2025
- 12265 Views
This feature allows failover to the backup path to occur in constant time per interface going down for features such as RSVP link protection, RSVP node protection, TI-LFA link protection, and BGP PIC. Without this feature enabled, it would take time proportional to the number of paths going over the interface experiencing the link down event to failover to the backup path. With this feature enabled, the failover time would be constant regardless of the number of paths.
- Written by Dylan Cho
- Posted on 4月 30, 2025
- Updated on 4月 30, 2025
- 253 Views
This feature implements the ability to configure any tx serdes parameters via the CLI. This is useful to work around any L1 issues that customers may encounter due to suboptimal networks/links/transceivers.
- Written by Tom Emmons
- Posted on 10月 22, 2024
- Updated on 5月 6, 2025
- 3488 Views
Cluster Load Balancing is a feature designed to ensure optimal load balancing of flows used as part of GPU based cluster communication. When this feature is enabled, a TOR router monitors RoCE traffic flowing between the GPU servers and spine uplinks and ensures optimal load balancing in the network.
- Written by Radu Handolescu
- Posted on 3月 3, 2023
- Updated on 5月 2, 2025
- 8504 Views
Common Management Interface Specification (CMIS) defines, starting with revision 4.0, a standard mechanism for managing the firmware of compliant transceivers. This mechanism allows for transceivers’ firmware to be updated without having to remove the transceiver from the switch. Firmware updates may be necessary in a testing or production environment to resolve potential firmware bugs. Some transceivers may also support firmware management operations in a hitless manner (without impacting traffic).
- Written by Xuan Qi
- Posted on 4月 30, 2025
- Updated on 4月 30, 2025
- 548 Views
This feature supports an alternative L3 EVPN gateway mechanism using multi-domain L3 VRF instead. A multi-domain IP VRF allows configuring not only the local domain route distinguisher (RD) and route targets (RT), but also the remote domain route distinguisher and route targets on a DCI gateway.
- Written by Deepak Sebastian
- Posted on 8月 18, 2022
- Updated on 5月 6, 2025
- 9199 Views
Arista’s DCS-7130LBR series of switches are powerful network devices designed for ultra latency applications along with a wealth of networking features.
- Written by Fathima Thasneem
- Posted on 4月 25, 2022
- Updated on 5月 16, 2025
- 9219 Views
As Ethernet technologies made their way into the Metropolitan Area Networks ( MAN ) and the Wide Area Networks ( WAN ), from the conventional enterprise level usage, they are now widely being used by service providers to provide end-to-end connectivity to customers. Such service provider networks are typically spread across large geographical areas. Additionally, the service providers themselves may be relying on certain internet backbone providers, referred to as “operators”, to provide connectivity in case the geographical area to be covered is too huge.
- Written by Sourabh Bollapragada
- Posted on 12月 22, 2020
- Updated on 5月 19, 2025
- 10299 Views
This feature supports counting ECN-marked packets (ECN = Explicit Congestion Notification) on a per egress port per tx-queue basis. The feature can be used to gather these packet counts via CLI or SNMP. There are two cases when an ECN-marked (congestion) packet is counted on the egress port/queue:
- Written by Sriharsha J
- Posted on 5月 1, 2015
- Updated on 5月 14, 2025
- 8273 Views
This feature allows generating the syslog message for the packets matching rules in egress ACLs. This can be enabled using the log keyword when configuring an ACL rule. A copy of the packet matching such an ACL rule is sent to the control plane, where a syslog entry for the packet header is generated.
- Written by Vamsi Anne
- Posted on 12月 29, 2021
- Updated on 5月 16, 2025
- 12635 Views
As Ethernet technologies made their way into the Metropolitan Area Networks (MAN) and the Wide Area Networks (WAN), from the conventional enterprise level usage, they are now widely being used by service providers to provide end-to-end connectivity to customers. Such service provider networks are typically spread across large geographical areas. Additionally, the service providers themselves may be relying on certain internet backbone providers, referred to as “operators”, to provide connectivity in case the geographical area to be covered is too huge. This mode of operation makes the task of Operations, Administration and Maintenance (OAM) of such networks to be far more challenging, and the ability of service providers to respond to such network faults swiftly directly impacts their competitiveness.
- Written by Christopher Yamashita
- Posted on 1月 3, 2025
- Updated on 5月 19, 2025
- 1436 Views
As Ethernet technologies made their way into the Metropolitan Area Networks (MAN) and the Wide Area Networks (WAN) from the conventional enterprise level usage, they are now widely being used by service providers to provide end-to-end connectivity to customers. Such service provider networks are typically spread across large geographical areas. Additionally, the service providers themselves may be relying on certain internet backbone providers, referred to as “operators”, to provide connectivity in case the geographical area to be covered is too huge. This mode of operation makes the task of Operations, Administration and Maintenance (OAM) of such networks far more challenging, and the ability of service providers to respond to frame loss in such networks directly impacts their competitiveness.
- Written by Shourya Agrawal
- Posted on 4月 25, 2025
- Updated on 4月 25, 2025
- 332 Views
This feature adds support for using the management port on AWE-7220RP-5TH-2S alternately as Ethernet8 port.
- Written by Ayush
- Posted on 1月 31, 2024
- Updated on 5月 15, 2025
- 5590 Views
In network deployments, where border leaf or Superspine act as PEG and it is in the transit path to other multicast VTEPs, the multicast stream will not pass since the border leaf will decapsulate the packet even if it doesn't have a receiver. This transit node is called the Bud Node. The device should be able to send decapsulated packets to any local receivers as well as send the encapsulated packets to other VTEPs.
- Written by Gokhan Tanisik
- Posted on 4月 25, 2025
- Updated on 4月 25, 2025
- 454 Views
This feature adds the ability for an L3 default gateway TEP in a Centralized Gateway topology to advertise its SVI virtual IP addresses to VARP MAC bindings and primary addresses to System MAC bindings using EVPN type-2 routes for EVPN VXLAN overlays. Two new commands, redistribute router-mac virtual-ip[next-hop vtep primary] and redistribute router-mac system ip are introduced to enable the redistributions. This would help the L2 TEP on the network to learn the default gateway IP without flooding an ARP request for the gateway IP. This feature is only intended for Centralized Gateway Topologies.
- Written by Marc Pawlowsky
- Posted on 3月 7, 2025
- Updated on 5月 15, 2025
- 833 Views
The agent DmaQueueMonitor provides visibility into packets coming up to the CPU via CPU queues. Packets are continuously sampled on monitored queues and kept available for reporting when a CPU congestion event occurs. When a queue that leads to CPU processing is congested a PCAP file may be created from the sampled packets that were captured from before and after the congestion event. The PCAP file is written to the file system for off-line examination.
- Written by James Shephard
- Posted on 8月 25, 2019
- Updated on 5月 19, 2025
- 12918 Views
Forwarding destination prediction enables visibility into how a packet is forwarded through the switch, allowing you to determine which interfaces a packet would egress out of. Typical use cases include, but are not limited to, determining egress members for Port-Channels and ECMPs.
- Written by Freedom Garcia
- Posted on 12月 24, 2024
- Updated on 5月 16, 2025
- 1597 Views
This feature, when enabled, allows NAT to function on traffic traversing between VRFs, over inter-VRF static routes or routes leaked to VRFs other than where they were configured.
- Written by Neel Neogi
- Posted on 12月 30, 2020
- Updated on 5月 15, 2025
- 15173 Views
The document describes the support for dedicated and group ingress policing on interfaces without using QoS policy-maps to match on the traffic and apply policing.
- Written by Kumaran Narayanan
- Posted on 4月 25, 2025
- Updated on 5月 2, 2025
- 461 Views
This feature enables IPv6 access control list (ACLs) on cloudEOS and Caravan devices, providing access control on incoming traffic (ingress direction). ACLs use packet classification to mark certain packets going through the packet processor pipeline and then take configured action against them. Rules are defined based on various fields of packets.
- Written by Brett Hatch
- Posted on 4月 30, 2025
- Updated on 4月 30, 2025
- 262 Views
This feature provides an IPv6 address provisioning mechanism which is driven by tenant authentication results and offers inter-tenant traffic isolation. The generated IPv6 connected route subnets can also be summarized into aggregate routes dynamically for advertising out to BGP peers.
- Written by Shelly Chang
- Posted on 10月 24, 2024
- Updated on 5月 13, 2025
- 2076 Views
This solution allows delivery of both IPv4 and IPv6 multicast traffic in an IP-VRF using an IPv6 multicast in the underlay network. The protocol used to build multicast trees in the underlay network is IPv6 PIM-SSM.
- Written by Sarah Chen
- Posted on 1月 12, 2022
- Updated on 5月 5, 2025
- 12648 Views
IS-IS flexible algorithm (FlexAlgo) provides a lightweight, simplified mechanism for performing basic traffic engineering functions within a single IS-IS area. FlexAlgo requires the cooperation of all nodes within the IS-IS area but does not require an external controller. Paths are computed by each node within the area, resulting in an MPLS switched forwarding path to nodes that are advertising a node Segment Identifier (SID) for the algorithm. The results of the path computation are placed in the colored tunnel RIB or system tunnel RIB, which simplifies route resolution.
- Written by Navneet Sinha
- Posted on 6月 29, 2016
- Updated on 5月 14, 2025
- 17263 Views
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.
- Written by Zeyad Tamimi
- Posted on 3月 3, 2023
- Updated on 5月 14, 2025
- 10901 Views
At a high level, L1 profiles are a set of configurations which allow EOS users to change the numbering scheme and default L1 configurations of all front panel interfaces across their network switch. On Arista network switches, front panel transceiver cages are exposed as ports which are numbered sequentially: 1, 2, 3, 4, etc. These identifiers are usually marked on the front panel to allow for easier identification.
- Written by Ajay Chhatwal
- Posted on 5月 15, 2020
- Updated on 5月 16, 2025
- 9874 Views
L2 protocol packets - LLDP, LACP and STP are trapped to the CPU by default. This feature allows for disabling the per protocol trap on a given set of interfaces.
- Written by Shriprama Rao
- Posted on 11月 20, 2023
- Updated on 5月 15, 2025
- 6750 Views
This feature allows encapsulating (and decapsulating) L2 traffic from a given interface or subinterface over a GRE tunnel. An MPLS label is added to identify the ingress interface (similar to MPLS pseudowires) and the GRE tunnel or nexthop-group is used to transport the packets to a remote endpoint.
- Written by Shyam Kota
- Posted on 6月 5, 2020
- Updated on 5月 14, 2025
- 9116 Views
This feature implements RFC 3478. It allows devices to preserve the MPLS LDP LFIB entries in the forwarding plane if the TCP connection is lost or LDP agent restarts.
- Written by Pedro Coutinho
- Posted on 12月 22, 2020
- Updated on 4月 30, 2025
- 13344 Views
The LDP pseudowire feature provides support for emulating Ethernet connections over a Multiprotocol Label Switching (MPLS) network using the extension of the MPLS Label Distribution Protocol (LDP)
- Written by Girish Dasari
- Posted on 4月 30, 2025
- Updated on 4月 30, 2025
- 277 Views
At a transit router when multiple LSP are available for a given destination from different protocols EOS does stitching based on hard coded preferences. LFIB stitching preferences give a provision to stitch together different LSPs based on configurable preferences. For each protocol(destination) preference can be configured for a given source protocol.
- Written by Sidak Aneja
- Posted on 4月 30, 2025
- Updated on 4月 30, 2025
- 247 Views
This TOI introduces a new global CLI configuration command to transition CMIS compliant transceivers to the low-power mode when all interfaces associated with the transceiver are shut down. Conversely, the transceivers will transition into high power mode when any interface associated with the transceiver is enabled.
- Written by Yashvir Singh
- Posted on 3月 2, 2021
- Updated on 5月 9, 2025
- 11036 Views
This feature allows classification of packets on QoS policy-maps based on the Class of Service (CoS), VLAN, Drop Eligible Indicator (DEI) in the 802.1q header of the packet. CoS (Class of Service) corresponds to the Priority code point (PCP) bits in the 802.1q header.
- Written by David Mirabito
- Posted on 12月 30, 2021
- Updated on 5月 21, 2025
- 20679 Views
MetaWatch is an FPGA-based feature available for Arista 7130 Series platforms. It provides precise timestamping of packets, aggregation and deep buffering for Ethernet links. Timestamp information and other metadata such as device and port identifiers are appended to the end of the packet as a trailer.
- Written by Kevin Amiraux
- Posted on 9月 30, 2015
- Updated on 5月 16, 2025
- 16636 Views
Arista switches provide several mirroring features. Filtered mirroring to CPU adds a special destination to the mirroring features that allows the mirrored traffic to be sent to the switch supervisor. The traffic can then be monitored and analyzed locally without the need of a remote port analyzer. Use case of this feature is for debugging and troubleshooting purposes.
- Written by Prakhar Rastogi
- Posted on 4月 23, 2018
- Updated on 5月 5, 2025
- 9817 Views
MLAG Smart System Upgrade (SSU) provides the ability to upgrade the EOS image of an MLAG switch with minimal traffic disruption.
- Written by Freedom Garcia
- Posted on 11月 5, 2021
- Updated on 5月 19, 2025
- 9375 Views
Non default VRF support is now available for Static unicast NAT. Twice NAT. Dynamic NAT. VRF support
- Written by Manjanagouda Patil
- Posted on 4月 30, 2025
- Updated on 4月 30, 2025
- 259 Views
Nexthop Group backup-activation events are produced by forwarding agents. Nexthop Groups supports configuring the backup paths through EOS RPC APIs and CLI. Whenever the route or prefix starts pointing to configured backup paths, a backup-activation event will be logged into the event-monitor DB with nexthop-group name, accurate timestamp and other attributes. The event monitoring feature also supports filtering the events based on the nexthop-group name, version etc.
- Written by Prashant Kumar
- Posted on 4月 30, 2025
- Updated on 4月 30, 2025
- 255 Views
Policy-map counters can be configured to display per-interface counters for all class-maps attached to all successfully programmed policy-maps. The feature is not enabled by default and has to be configured through the command line interface. When enabled, the output of the show command will display both per-interface and aggregate counters.
- Written by Mukund PB
- Posted on 6月 20, 2022
- Updated on 5月 8, 2025
- 8753 Views
Priority Flow Control (PFC) Watchdog feature monitors interfaces for priority-flow-control Pause storm. If such a storm is detected on no-drop enabled priorities, it takes actions such as:
- Written by Ioana Costea
- Posted on 4月 25, 2025
- Updated on 4月 25, 2025
- 327 Views
Introduced in the 4.34.0F release, the maximum links feature allows users to specify the number of active members in both LACP and static port-channels. If active members become inactive due to configuration changes or link failure, previously restricted members can become active. This ensures the port-channel remains operational, preventing disruptions even if all initial active members fail.
- Written by Tom Meng
- Posted on 11月 11, 2019
- Updated on 5月 7, 2025
- 8488 Views
Power management is a way to limit the total available power to be used for Power over Ethernet (PoE) ports. Without power management, the total amount of power that the power supply units (PSU) are able to provide is used. Power management can be used to create power redundancies. For example, if a system has 2 1050W PSUs, the feature can set the total available power to be 800W for PoE. With this configuration, 1 PSU is sufficient to power the system and the unused PSU acts as a backup source, thus giving the system a 1+1 redundancy.
- Written by Prakhar Rastogi
- Posted on 2月 26, 2024
- Updated on 5月 5, 2025
- 5933 Views
RADIUS proxy feature enables proxying RADIUS requests from a RADIUS client and forwarding it to a remote RADIUS server. Similarly, RADIUS proxy receives the reply from the remote RADIUS server and forwards it to the client.
- Written by David Cronin
- Posted on 3月 4, 2022
- Updated on 5月 19, 2025
- 21002 Views
Routing control functions (RCF) is a language that can be used to express route filtering and attribute modification logic in a powerful and programmatic fashion.
- Written by Kalash Nainwal
- Posted on 12月 14, 2020
- Updated on 5月 5, 2025
- 14591 Views
RSVP-TE, the Resource Reservation Protocol (RSVP) for Traffic Engineering (TE), is used to distribute MPLS labels for steering traffic and reserving bandwidth. The Label Edge Router (LER) feature implements the headend functionality, i.e., RSVP-TE tunnels can originate at an LER which can steer traffic into the tunnel.
- Written by Martin Stigge
- Posted on 3月 3, 2025
- Updated on 5月 14, 2025
- 845 Views
RSVP-TE P2MP LER adds ingress and egress support for Point-to-Multipoint (P2MP) LSPs to be used in Multicast Virtual Private Network (MVPN) as an extension to the LSR support which adds transit support.
- Written by Ruoyi Wang
- Posted on 4月 30, 2025
- Updated on 4月 30, 2025
- 288 Views
The sFlow EVPN MPLS extension adds support for providing information related to the bridging domain in sFlow packet samples, for traffic forwarded through L2 EVPN MPLS.
- Written by Przemyslaw Jacak
- Posted on 4月 30, 2025
- Updated on 4月 30, 2025
- 329 Views
This feature allows users to configure SNMP’s context to provide a value from a default context when no such value is provided in the context queried.
This feature aims to solve two problems: