- Written by Tarun Jaswanth LNU
- Posted on August 24, 2020
- Updated on July 3, 2024
- 23705 Views
802.1X is an IEEE standard protocol that prevents unauthorized devices from gaining access to the network.
- Written by Joanne Mikkelson
- Posted on March 8, 2024
- Updated on March 8, 2024
- 1936 Views
Prior to this feature, when the multi-agent routing protocol model was in use, the BGP agents (Bgp and, starting with 4.22.1F, BgpCliHelper) were always running, even if BGP was not configured. With this feature, these two BGP agents do not start up until BGP configuration is created with “router bgp <asn>”.
- Written by Andrew Li
- Posted on August 31, 2023
- Updated on April 10, 2024
- 4492 Views
This feature enables Flowspec rules to be leaked from one VRF to another. When combined with the ability to apply Flowspec rules from one VRF to interfaces in another VRF, this feature makes it possible to combine rules from different source VRFs into a target VRF, and apply the target VRF’s rules on the interfaces of the source VRFs.
- Written by Nandan Saha
- Posted on August 24, 2020
- Updated on May 22, 2024
- 10555 Views
The BGP-LS extension allows IGPs (OSPF/IS-IS) link state database information to be injected into BGP. This is typically used in deployments where some external component, (like a controller or Path Computation Engine) can do centralized path computations by learning the entire IGP topology through BGP-LS. The controller can then communicate the computed paths based on the BGP-LS updates to the head end device in the network. The mechanism used by the controller to communicate the computed TE paths is outside the scope of this document. Using BGP-LS instead of an IGP peering with the controller to distribute IGP link state information has the following advantages.
- Written by Qianchen Zhao
- Posted on December 20, 2019
- Updated on March 7, 2024
- 8506 Views
BGP Monitoring Protocol (BMP) allows a monitoring station to connect to a router and collect all of the BGP announcements received from the router’s BGP peers. The announcements are sent to the station in the form of BMP Route Monitoring messages generated from path information in the router’s BGP Adj-Rib-In tables.
- Written by Vijay Amritraj
- Posted on February 26, 2024
- Updated on February 26, 2024
- 1967 Views
Arista switches mentioned in below platform compatibility section have two chip profiles. ADNA is the default chip profile in which the system boots up starting from 4.31.2F release.
- Written by Rajat Jain
- Posted on March 11, 2024
- Updated on March 12, 2024
- 1859 Views
Custom (per-port) Cos To Traffic-Class Qos Map on DCS-7280R3, DCS7800R3, DCS-7500R3 .This feature allows the user to define a custom COS-To-TC map and apply to an interface. The custom COS-To-TC map would only be applicable when the interface is in CoS trust mode.
- Written by Jacob Sword
- Posted on February 16, 2022
- Updated on March 7, 2024
- 8500 Views
Multiple dynamic counter features may be enabled simultaneously, primarily configured using the [no] hardware counter feature [feature] CLI commands. Compatibility of these features has been enhanced to allow for greater flexibility in simultaneously enabled counter features. Changes in counter feature compatibility across EOS releases is detailed below.
- Written by Abhiram Kalluru
- Posted on February 26, 2024
- Updated on February 26, 2024
- 2200 Views
EOS SDK and its RPC counterpart traditionally offer two separate calls for configuring static routes. These calls are ip_route_set/ip_route_via_set and mpls_route_set/mpls_route_via_set. When calling the SDK API directly the calling latency is negligible, since it is a simple function call. However, the time of each of those calls can become a considerable factor with the adoption of RPC. To reduce the overall latency associated with creating and updating numerous routes, EOS SDK RPC now supports bulk calls.
- Written by Vamsi Anne
- Posted on December 29, 2021
- Updated on May 7, 2024
- 9367 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 Lavanya Conjeevaram
- Posted on December 22, 2017
- Updated on August 16, 2024
- 8110 Views
In the traditional data center design, inter-subnet forwarding is provided by a centralized router, where traffic traverses across the network to a centralized routing node and back again to its final destination. In a large multi-tenant data center environment this operational model can lead to inefficient use of bandwidth and sub-optimal forwarding.
- Written by Pauric Ward
- Posted on March 13, 2024
- Updated on April 29, 2024
- 2141 Views
Administrative Groups (AG) provide a way to associate certain attributes or policies with links, enabling network administrators to control the routing decisions based on specific criteria. Extended Administrative Groups (EAG) are an extension of AG which allow a larger range of admin groups to be utilized for various Traffic Engineering (TE) purposes within a network.
- Written by Edwin Tambi
- Posted on August 19, 2020
- Updated on July 3, 2024
- 18391 Views
EOS supports the ability to match on a single VLAN tag (example: encapsulation dot1q vlan 10) or a VLAN tag pair (example: encapsulation dot1q vlan 10 inner 20) to map matching packets to an interface. In this case, the encapsulation string is considered consumed by the mapped interface before forwarding, which means that the tags are effectively removed from the incoming packet for the purposes of any downstream forwarding.
- Written by Sidharth
- Posted on February 26, 2024
- Updated on February 26, 2024
- 2032 Views
The EOS implementation of OSPF uses an alternate Area Border Router (ABR) behavior as specified in the IETF draft document. This is implemented as an optimization over the standard OSPF so that the packets would not be dropped when a router loses Active backbone connection which could otherwise be successfully forwarded.
- Written by Steven Beaudette
- Posted on March 13, 2024
- Updated on March 19, 2024
- 1912 Views
The Inline Pipeline Integrity Checker (IPIC) feature is used to verify that internal packet processing pipelines are not inadvertently corrupting packets or causing what is commonly referred to as a “bit flip.”
- Written by Madhu Sudan
- Posted on June 21, 2020
- Updated on February 21, 2024
- 9013 Views
Several customers have expressed interest in using IPv6 addresses for VXLAN underlay in their Data Centers (DC). Prior to 4.24.1F, EOS only supported IPv4 addresses for VXLAN underlay, i.e., VTEPs were reachable via IPv4 addresses only.
- Written by Bharath Somayaji
- Posted on September 30, 2015
- Updated on March 7, 2024
- 5790 Views
SPF Timers can be used in IS-IS to throttle the frequency of shortest-path-first (SPF) computations. In networks with a lot of churn, using these timers will help in containing the effect of network disruptions arising out of frequent SPF runs.
- Written by Zeyad Tamimi
- Posted on March 3, 2023
- Updated on May 15, 2024
- 7152 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.
- Written by Nathan Wolfe
- Posted on February 15, 2018
- Updated on February 21, 2024
- 10592 Views
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.
- Written by Andrei Dvornic
- Posted on April 2, 2015
- Updated on February 8, 2024
- 10331 Views
Loop protection is a loop detection and prevention method which is independent of Spanning Tree Protocol (STP) and is not disabled when the switch is in switchport backup mode or port is in discarding state. The LoopProtect agent has a method to detect loops and take action based on the configuration by the user. In order to find loops in the system, a loop detection frame is sent out periodically on each interface that loop protection is enabled on. The frame carries broadcast destination MAC address, bridge MAC source address, OUI Extended EtherType 0x88b7 as well as information to specify the origins of the packet.
- Written by Etash Tyagi
- Posted on February 19, 2024
- Updated on February 19, 2024
- 2097 Views
The macsec scheduler compensation feature is used to automatically make adjustments to the packet size seen by the scheduler for macsec encrypted traffic, based on mac security configuration. This feature is useful when macsec is configured on an interface. When a packet egresses out of the macsec enabled interface, the packet gets encrypted by adding additional macsec headers.
- Written by Suresh Krishnan Balakrishnan
- Posted on June 10, 2019
- Updated on March 4, 2024
- 7732 Views
The main motivation for the feature is to provide high availability to the ManagementActive interface (Management0) via multiple redundant paths in the modular system. The ManagementActive interface(Management0) is a virtual interface pointing to the active supervisor.
- Written by John Clarke
- Posted on December 20, 2021
- Updated on March 19, 2024
- 10168 Views
Arista's 7130 Connect Series of Layer 1+ switches are powerful network devices designed for ultra low latency and offer a wealth of integrated management features and functionalities.
- Written by David Mirabito
- Posted on December 30, 2021
- Updated on July 30, 2024
- 13432 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 Abdul Haseeb Jehangir
- Posted on March 12, 2020
- Updated on July 17, 2024
- 10104 Views
Mirror on drop is a network visibility feature which allows monitoring of MPLS or IP flow drops occurring in the ingress pipeline. When such a drop is detected, it is sent to the control plane where it is processed and then sent to configured collectors. Additionally, CLI show commands provide general and detailed statistics and status.
- Written by Binoshmon T B
- Posted on February 26, 2024
- Updated on February 26, 2024
- 2293 Views
This feature serves as a valuable tool for pinpointing the nature of network traffic at a device under congestion. By mirroring packets from congested queues to a designated mirror destination or CPU for analysis and monitoring, it provides network administrators and operators with the capability to gain an understanding of the traffic contributing to the congestion.
- Written by Ajay Kini
- Posted on March 13, 2024
- Updated on March 13, 2024
- 1908 Views
MPLS over GUE (Generic UDP Encapsulation) is a tunneling mechanism for encapsulating MPLS IP traffic in a UDP header. This feature adds support for MPLS over GUE encapsulation for BGP VPN routes resolving over IPv4 next hops.
- Written by Prashanth Krishnamurthy
- Posted on March 7, 2024
- Updated on March 8, 2024
- 2289 Views
This feature allows the packets to be VxLAN encapsulated after NAT translation, Reverse NAT translation applied on VxLAN tunnel terminated packets
- Written by Seng Leung
- Posted on March 8, 2024
- Updated on March 8, 2024
- 2146 Views
For Macro Segmentation Service Group (MSS-G) configurations, if only the segmentation model for OpenConfig is required, then it is possible to disable all other models for OpenConfig. This feature allows access to only the /segmentation path in the OpenConfig YANG tree. This significantly reduces the OpenConfig agent’s memory usage.
- Written by Shashank Manjunath
- Posted on February 7, 2024
- Updated on February 9, 2024
- 2123 Views
This feature adds configuration support for the OSPFv2 OpenConfig model via gNMI. Currently, only a limited set of config paths are supported and no state paths are supported. Supported paths can be found at OpenConfig Path Support
- Written by Ilia Lebedev
- Posted on March 13, 2024
- Updated on March 15, 2024
- 1977 Views
This feature allows a compatible SSH client to authenticate to EOS via a FIDO2-anchored SSH key via the “이 이메일 주소가 스팸봇으로부터 보호됩니다. 확인하려면 자바스크립트 활성화가 필요합니다.” or “이 이메일 주소가 스팸봇으로부터 보호됩니다. 확인하려면 자바스크립트 활성화가 필요합니다.” key types. In OpenSSH this was introduced in version 8.2p1. This feature is not compatible with the Federal Information Processing Standards (FIPS)restrictions mode in EOS; if both are configured, this feature will take precedence.
- Written by Edwin
- Posted on February 26, 2024
- Updated on February 26, 2024
- 2008 Views
If two or more streams of packets are subjected to the same policer, the policing may not be fair, that is, the policer might exhibit bias towards one of the streams. Fair policing across all the streams is not guaranteed. Policer fairness provides a way to reduce this bias and maintain fair distribution of policer bandwidth among the input streams proportional to the ingress rate.
- Written by David Cronin
- Posted on March 3, 2022
- Updated on March 14, 2024
- 8720 Views
This document describes a new CLI command to help debug how and why policy permits and denies paths. The aim of this CLI command is for the user to debug a route map or RCF (Routing Control Functions) function by specifying as input a prefix for which BGP has reachability for, either via a BGP peer or a redistribute source.
- Written by Ethan Vadai
- Posted on March 6, 2020
- Updated on March 14, 2024
- 15301 Views
Policy-based routing (PBR) is a feature that is applied on routable ports, to preferentially route packets. Forwarding is based on a policy that is enforced at the ingress of the applied interface and overrides normal routing decisions. In addition to matches on regular ACLs, PBR policy-maps can also include “raw match” statements that look like a single entry of an ACL as a convenience for users.
- Written by Coy Humphrey
- Posted on September 15, 2020
- Updated on June 7, 2024
- 9473 Views
This TOI describes a set of enhancements made to the existing Port Security: Protect Mode (PortSec-Protect) feature. Please see the existing TOI for this feature here:Port Security: Protect Mode
- Written by Padmanabh Ratnakar
- Posted on April 20, 2021
- Updated on July 15, 2024
- 12570 Views
The postcard telemetry (GreenT - GRE Encapsulated Telemetry) feature is used to gather per flow telemetry information like path and per hop latency. For network monitoring and troubleshooting flow related issues, it is desirable to know the path, latency and congestion information for flows at different times.
- Written by Prakhar Rastogi
- Posted on February 26, 2024
- Updated on February 26, 2024
- 2828 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 remote RADIUS server and forwards it to the client.
- Written by Eamon Doyle
- Posted on December 15, 2020
- Updated on March 15, 2024
- 8815 Views
In a Service Provider (SP) network, a Provider Edge (PE) device learns virtual private network (VPN) paths from remote PEs and uses the Route Target (RT) extended communities carried by those paths to determine which customer Virtual Routing and Forwarding (VRF) the paths should be imported into (from where they can be subsequently advertised to Customer Edge (CE) devices).
- Written by David Cronin
- Posted on March 3, 2022
- Updated on July 9, 2024
- 16634 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 David Cronin
- Posted on March 3, 2022
- Updated on August 28, 2024
- 10260 Views
Routing Control Functions (RCF) is a language that can express route filtering and attribute modification logic in a powerful and programmatic fashion.The document covers: Configurations of a RCF function for BGP points of application
- Written by Kalash Nainwal
- Posted on December 14, 2020
- Updated on July 31, 2024
- 11298 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 October 22, 2018
- Updated on July 19, 2024
- 9497 Views
RSVP-TE applies the Resource Reservation Protocol (RSVP) for Traffic Engineering (TE), i.e., to distribute MPLS labels for steering traffic and reserving bandwidth.
- Written by Athish Rao
- Posted on March 5, 2021
- Updated on May 30, 2024
- 10667 Views
Segment Routing Traffic Engineering Policy (SR-TE) aka SR Policy makes use of Segment Routing (SR) to allow a headend to steer traffic along any path without maintaining per flow state in every node. A headend steers traffic into an SR Policy.
- Written by Adrian Fettes
- Posted on April 10, 2024
- Updated on April 10, 2024
- 1792 Views
sFlow is a technology for monitoring traffic in data networks containing switches and routers. This document details supported platforms for the sFlow Version 5 specification, as well as which platforms are supported for various flow_data and sample_data types.
- Written by Karan Jagjit Kumar
- Posted on June 29, 2023
- Updated on February 15, 2024
- 5013 Views
Smart System Upgrade (SSU) provides the ability to upgrade the EOS image with minimal traffic disruption. This is an existing feature on many fixed system products. This resource will outline the SSU feature in reference to CCS-720DP, CCS-722XPM, CCS-720XP-96ZC2 and DCS-7010TX.
- Written by Venkata Kishore Madhbhaktula
- Posted on September 1, 2021
- Updated on February 22, 2024
- 7859 Views
This TOI describes details and limitations of Stateful Switchover on Modular chassis with 7500R3, 7800R3, 7800R3A based line cards.
- Written by Ram Murthy
- Posted on March 3, 2023
- Updated on August 27, 2024
- 5779 Views
NAT has been supported in DCS-7150 for many years. Starting at EOS 4.21.6F, NAT functionality is supported on certain 7050X3 platforms.
- Written by Scott Bailey
- Posted on May 23, 2022
- Updated on February 21, 2024
- 5848 Views
The CCS-750X-48ZXP is a 48 port 10GBASE-T linecard, capable of several full-duplex link speeds to support connecting to a variety of compatible devices of varying capabilities. All supported linkup speeds on this card can be automatically selected during the linkup process using IEEE 802.3 Clause 28 auto-negotiation. Note that IEEE 802.3 also allows for speeds lower than 1Gbps to link up without clause 28 auto-negotiation.
- Written by Rutger Beltman
- Posted on February 7, 2024
- Updated on February 9, 2024
- 2296 Views
In EOS-4.31.2F ipv6 link-local next-hops can now be configured in BGP through RCF (Routing Control Functions). On the advertising BGP agent an ipv6 link-local next-hop is configured on the outbound policy function. The receiving BGP agent reads this link-local next-hop and automatically assigns the interface from which the BGP path was sent.
- Written by Alok Kumar
- Posted on February 7, 2024
- Updated on June 12, 2024
- 3069 Views
Dot1q (802.1Q) is a tunneling protocol that encapsulates traffic from multiple customer (c-tag) VLANs in an additional single outer service provider (s-tag) VLAN for transit across a larger network structure that includes traffic from all customers. Tunneling eliminates the service provider requirement that every VLAN be configured from multiple customers, avoiding overlapping address space issues.