- Written by Digvijay Gahlot
- Posted on April 20, 2021
- Updated on January 23, 2023
- 6047 Views
The L2 EVPN MPLS feature is available when configuring BGP in the multi-agent routing protocol model. Ethernet VPN (EVPN) is an extension of the BGP protocol introducing a new address family: L2VPN (address family number 25) / EVPN (subsequent address family number 70). It is used to exchange overlay MAC and IP address reachability information between BGP peers.
- Written by Ziqian XU
- Posted on October 21, 2021
- Updated on October 21, 2021
- 3466 Views
Support for AES GCM has been added as a method for storing symmetric secrets in EOS. This applies to secrets that must be
- Written by Gary McCarthy
- Posted on February 8, 2017
- Updated on October 13, 2021
- 3382 Views
The default policy behavior is to permit/accept all routes when a BGP neighbor or peer group is configured with a route
- Written by Manoj Agiwal
- Posted on September 30, 2015
- Updated on March 28, 2022
- 7008 Views
BGP Non Stop Forwarding (NSF) aims to minimize the traffic loss when the the following scenarios occur:
- Written by Ketan Kotak
- Posted on November 7, 2021
- Updated on November 7, 2021
- 2988 Views
This feature improves the switch behavior when it overheats. The feature can be configured using the CLI.
- Written by Jeevan Kamisetty
- Posted on August 16, 2018
- Updated on November 2, 2021
- 2897 Views
DHCPv6 relay supports Remote ID option (37) insertion in relay messages providing the Layer 3 interface name on which
- Written by Mike Nelson
- Posted on October 20, 2021
- Updated on December 20, 2021
- 3381 Views
Tagging traffic with a drop precedence is a method that can be used to differentiate traffic flows over a given
- Written by Jeff Wen
- Posted on January 21, 2019
- Updated on July 12, 2023
- 4370 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 Wade Carpenter
- Posted on April 24, 2020
- Updated on January 27, 2023
- 7868 Views
EVPN MPLS VPWS (RFC 8214) provides the ability to forward customer traffic to / from a given attachment circuit (AC)
- Written by James Shephard
- Posted on August 25, 2019
- Updated on July 5, 2023
- 5001 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 Charlotte Fedderly
- Posted on June 22, 2021
- Updated on February 24, 2022
- 3140 Views
Forwarding destination prediction enables visibility into how a packet is forwarded through the switch and allows
- Written by Seng Leung
- Posted on October 27, 2021
- Updated on October 27, 2021
- 3686 Views
Traditionally, the OpenConfig gNMI service is based on a dial in model. A client sends a request to the gNMI server and
- Written by Matthew Carrington-Fair
- Posted on October 20, 2021
- Updated on December 30, 2021
- 2948 Views
Prior to EOS 4.27.0F, MPLS tunnel egress counters could only be enabled for all MPLS tunnels present in the system
- Written by Shyam Kota
- Posted on April 9, 2021
- Updated on November 2, 2021
- 3669 Views
gNOI (gRPC Network Operations Interface) defines a set of gRPC based microservices for executing operational
- Written by Utkarsha Verma
- Posted on February 18, 2021
- Updated on November 17, 2021
- 4081 Views
Arista campus switches allow extensive and fine grained hardware based flow tracking and management features. They
- Written by Arpit Bansal
- Posted on December 21, 2020
- Updated on January 17, 2022
- 3878 Views
IGP shortcuts enable traffic to get forwarded along traffic engineered paths computed by RSVP using a modified SPF
- Written by Neel Neogi
- Posted on November 3, 2021
- Updated on July 13, 2023
- 3360 Views
This document describes the support for interface policing counters on interfaces where interface policing feature is configured. Counters for this feature provide information on how many packets are being allowed or dropped on a given interface via the policers configured. The counters are only supported on interfaces where dedicated policers are configured.
- Written by Bharath Somayaji
- Posted on November 12, 2019
- Updated on November 12, 2019
- 4120 Views
IP Locking is an EOS feature configured on an Ethernet Layer 2 port. When enabled, it ensures that a port will only
- Written by Nitin Sao
- Posted on November 9, 2021
- Updated on November 9, 2021
- 2728 Views
This feature allows configuration of the IS IS CSNP generation interval. The default CSNP interval is 10
- Written by Sarah Chen
- Posted on January 12, 2022
- Updated on September 8, 2023
- 4167 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 Tanushree Bansal
- Posted on June 21, 2021
- Updated on October 27, 2021
- 2848 Views
This feature provides support for multiple IS IS instances in the default VRF. Multiple IS IS instances are only
- Written by Marc Laprade
- Posted on November 3, 2021
- Updated on June 13, 2023
- 4179 Views
This feature will allow the user to select whether port mirror destinations of type GRE tunnel include the optional “key” field in the GRE header on certain platforms. The key field allows the user to uniquely identify a particular packet flow. The feature also allows the user to specify the value of the 32 bit key field.
- Written by Prakrati Vidyarthi
- Posted on August 16, 2018
- Updated on September 8, 2023
- 7154 Views
Normally, a switch traps L2 protocol frames to the CPU. However, certain use-cases may require these frames to be forwarded or dropped. And in cases where the L2 protocol frames are forwarded (eg: Pseudowire), we may require the frames to be trapped to the CPU or dropped.
- Written by Xin Guang (Tony) Du
- Posted on August 25, 2016
- Updated on November 23, 2020
- 5545 Views
The LDP pseudowire feature provides support for emulating Ethernet connections over a Multiprotocol Label
- Written by Andrew Li
- Posted on November 11, 2021
- Updated on December 28, 2021
- 3705 Views
Egress Peer Engineering (EPE) using BGP LU enables traffic engineering of the links between Autonomous Systems
- Written by Weichen Zhao
- Posted on May 12, 2022
- Updated on May 13, 2022
- 2876 Views
Generic UDP Encapsulation (GUE) is a general method for encapsulating packets of arbitrary IP protocols within a UDP tunnel. GUE provides an extensible header format with optional data. In this release, the ability to encapsulate MPLS over GUE packets of variant 1 header format has been added.
- Written by Binoshmon T B
- Posted on July 22, 2020
- Updated on June 27, 2022
- 5886 Views
The TCP MSS clamping feature involves clamping the maximum segment size (MSS) in the TCP header of TCP SYN packets if it exceeds the configured MSS ceiling limit for the interface. Clamping MSS value helps in avoiding IP fragmentation in tunnel scenarios by ensuring that MSS is small enough to accommodate the extra overhead of GRE and tunnel outer IP headers.
- Written by Swati Patel
- Posted on October 27, 2021
- Updated on June 22, 2022
- 7178 Views
[L2 EVPN] and [Multicast EVPN IRB] solutions allow for the delivery of customer BUM (Broadcast, Unknown unicast and Multicast) traffic in a L2VPN and L3VPNs respectively using multicast in the underlay network.
- Written by Freedom Garcia
- Posted on November 5, 2021
- Updated on February 7, 2022
- 3392 Views
Non default VRF support is now available for Static unicast NAT. Twice NAT. Dynamic NAT. VRF support
- Written by Midul Jacob
- Posted on January 12, 2022
- Updated on January 12, 2022
- 2915 Views
A Link Aggregation Group (LAG) is used to aggregate/gather together multiple physical links into a single logical
- Written by Shubham Jangid
- Posted on November 9, 2021
- Updated on November 9, 2021
- 2827 Views
Policing on the 7280R and 7280R2 series is typically done on the L2 packet size that is, the size on the wire, excluding
- Written by Padmanabh Ratnakar
- Posted on April 20, 2021
- Updated on September 21, 2023
- 6324 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 Eudean Sun
- Posted on August 28, 2019
- Updated on November 3, 2021
- 3324 Views
Power over Ethernet (PoE) is a way of delivering power and data over the same Ethernet wires. There have been multiple
- Written by Ryan Lui
- Posted on October 20, 2021
- Updated on October 20, 2021
- 3085 Views
This brief TOI describes a small update made to Arista’s implementation of the Best Master Clock Algorithm (BMCA),
- Written by Harshit Jain
- Posted on January 11, 2022
- Updated on January 11, 2022
- 3477 Views
RADIUS protocol specifies the existence of Dynamic Authorization messages which provides a mechanism to change the
- Written by Sharad Birmiwal
- Posted on November 4, 2020
- Updated on February 11, 2022
- 8902 Views
Routing control functions (RCF) is a new language that can be used to express BGP route filtering and attribute
- Written by Saurav Arora
- Posted on January 7, 2022
- Updated on January 7, 2022
- 2871 Views
Traffic steering enables traffic for a specified set of prefixes to get forwarded along traffic engineered paths
- Written by Martin Stigge
- Posted on September 16, 2020
- Updated on January 11, 2022
- 4327 Views
RSVP TE, the Resource Reservation Protocol (RSVP) for Traffic Engineering (TE), is used to distribute MPLS labels
- Written by Manoharan Sundaramoorthy
- Posted on September 4, 2018
- Updated on February 5, 2022
- 7499 Views
Segment Routing Traffic Engineering Policy (SR TE) aka SR Policy makes use of Segment Routing (SR) to allow a headend
- Written by Joel Katticaran
- Posted on September 1, 2021
- Updated on November 10, 2021
- 2933 Views
This feature extends the existing functionality to set explicit next hop addresses for vpn ipv4 and vpn ipv6 routes.
- Written by Rehmanali Jiwani
- Posted on January 6, 2022
- Updated on January 6, 2022
- 2664 Views
The sFlow source IP address (also known as the agent IP address) is placed in the sFlow datagrams that the switch sends
- Written by Thejesh Panchappa
- Posted on May 1, 2015
- Updated on May 16, 2023
- 3334 Views
This is an infrastructure that provides management of SSL certificates, keys and profiles. SSL/TLS is an application-layer protocol that provides secure transport between client and server through a combination of authentication, encryption and data integrity. SSL/TLS uses certificates and private-public key pairs to provide this security.
- Written by Bruno Perriot
- Posted on July 13, 2018
- Updated on November 7, 2021
- 3086 Views
Stateful switchover is a redundancy mode available on systems with 2 supervisor cards. One supervisor card is active
- Written by Tanuj Kumar Jhamb
- Posted on October 21, 2021
- Updated on October 26, 2021
- 3131 Views
Support for matching of DSCP / ECN is available under the QOS class map configuration on Arista switches.
- Written by Anubhav Choudhary
- Posted on November 24, 2021
- Updated on November 24, 2021
- 2516 Views
In Dynamic Path Selection (DPS), it takes a fixed 5 seconds in order to detect failure in the path as the underlying
- Written by Josh Pfosi
- Posted on June 11, 2019
- Updated on September 4, 2023
- 6112 Views
This feature adds support for CPU traffic policy capable of matching and acting on IP traffic which would otherwise
- Written by Rajiv Patil
- Posted on September 16, 2020
- Updated on March 29, 2023
- 6199 Views
Dynamic NAT is a feature which dynamically allocates an IP address to an incoming or outgoing flow. This address will replace source or destination IP for all packets of the flow.
- Written by Binglai Niu
- Posted on October 21, 2021
- Updated on October 21, 2021
- 3050 Views
Nexthop groups is a routing mechanism where users can configure a set of nexthops by specifying their nexthop
- Written by Harsh Goyal
- Posted on December 21, 2020
- Updated on August 24, 2023
- 3717 Views
IPv4 Unicast Reverse Path Forwarding (uRPF) can help limit malicious IPv4 traffic on a network. uRPF works by
- Written by Legena P K
- Posted on August 21, 2020
- Updated on September 1, 2023
- 3202 Views
IPv6 Unicast Reverse Path Forwarding (uRPF) can help limit malicious IPv6 traffic on a network. uRPF works by