- Written by Hyun Chul Chung
- Posted on June 10, 2020
- Updated on October 14, 2021
- 8675 Views
As of EOS 4.22.0F, EVPN all active multihoming is supported as a standardized redundancy solution. Redundancy
- Written by Tarun Jaswanth LNU
- Posted on August 24, 2020
- Updated on October 17, 2024
- 25433 Views
802.1X is an IEEE standard protocol that prevents unauthorized devices from gaining access to the network.
- Written by Ajay Kini
- Posted on June 21, 2020
- Updated on February 15, 2024
- 8482 Views
Accumulated IGP Metric (AIGP) is an optional non-transitive BGP attribute used to carry an IGP metric with BGP route advertisements. The AIGP attribute is useful for tie-breaking in BGP bestpath selection so that routing decisions can be made on the basis of shortest path/lowest IGP cost path amongst multiple BGP paths. This is particularly applicable in scenarios where a single administration is subdivided into multiple Autonomous Systems (AS) each with similar routing policies and the same IGP in use such that the IGP metric for a route can be propagated usefully between the ASes so as to let receiving BGP speakers make routing decisions based on the cumulative IGP cost of the route. This set of ASes in a common administrative domain in the context of advertising and receiving the AIGP attribute are referred to as an AIGP administrative domain.
- Written by John Foley
- Posted on June 3, 2020
- Updated on June 3, 2020
- 6441 Views
The “set as path prepend” and “set as path match all replacement” route map configuration
- Written by Srinivasan Koona Lokabiraman
- Posted on June 3, 2020
- Updated on June 3, 2020
- 7991 Views
It is often useful to know on a per AFI/SAFI basis, the number of paths that have been selected from a peer as best paths.
- Written by Jason Shamberger
- Posted on March 11, 2020
- Updated on April 18, 2024
- 15650 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 Vipul Shah
- Posted on March 13, 2020
- Updated on May 4, 2022
- 8930 Views
The goal of IAR operation is to minimize the CPU processing and churn in hardware by identifying a set of nexthop adjacencies such that updating those adjacencies in-place is sufficient to correctly forward the traffic quickly for all the affected routes.
- Written by Saurav Arora
- Posted on January 18, 2019
- Updated on September 3, 2020
- 7476 Views
Neighbor default originate feature is used to advertise a default route to the neighbor (peer or peer group) even when
- Written by Manoj Agiwal
- Posted on September 30, 2015
- Updated on July 12, 2024
- 17273 Views
BGP Non Stop Forwarding (NSF) aims to minimize the traffic loss when the the following scenarios occur:
- Written by Jason Shamberger
- Posted on April 20, 2020
- Updated on February 19, 2024
- 10582 Views
RPKI provides a mechanism to validate the originating AS of an advertised prefix.
- Written by Keon Vafai
- Posted on June 22, 2020
- Updated on July 19, 2024
- 13866 Views
This feature adds support for BGP UCMP in the multi agent routing protocol model. The TOI for BGP UCMP in the ribd
- Written by Trevor Mendez
- Posted on April 17, 2020
- Updated on February 5, 2022
- 7219 Views
Segment Routing Traffic Engineering Policy (SR TE) aka SR Policy makes use of Segment Routing (SR) to allow a headend
- Written by Cihan Ekici
- Posted on June 3, 2020
- Updated on June 3, 2020
- 6579 Views
On most PHYs, we run a sequence of steps in order to bring the links up reliably, because of it’s conservative
- Written by Vishwanath Sungal
- Posted on June 22, 2020
- Updated on June 22, 2020
- 6454 Views
EOS 4.24.1 introduces Linecard management changes in the DCS 7368X4 series. In this release, the DCS 7368 is
- Written by Huong Nguyen
- Posted on November 13, 2019
- Updated on October 12, 2023
- 13277 Views
Support for DHCPv4 (RFC 2131) and DHCPv6 Server (RFC 8415) was added to EOS-4.22.1 and EOS-4.23.0 respectively. EOS DHCP server leverages ISC Kea as backend. The router with DHCP Server enabled acts as a server that allocates and delivers network addresses with desired configuration parameters to its hosts.
- Written by Haotian Zhang
- Posted on June 19, 2020
- Updated on June 19, 2020
- 5951 Views
This article describes the support for specifying DSCP mask in IPv4 and IPv6 access lists. DSCP mask can be used to
- Written by Vamsi Anne
- Posted on July 17, 2020
- Updated on July 17, 2020
- 7514 Views
Egress Sflow sampling feature allows to sample unicast packets based on the egress interface. The
- Written by Rick Porter
- Posted on June 29, 2020
- Updated on June 29, 2020
- 7534 Views
Fast poll counters allow for rapid collection of a basic set of MAC counters on supported platforms at a very high
- Written by Yagna Siriki
- Posted on June 15, 2020
- Updated on June 15, 2020
- 5969 Views
Starting from EOS 4.24.0F and EOS 4.24.0FX, RADIUS Attribute 8 (Framed IP Address) is included in Accounting Start,
- Written by Deepak Sebastian
- Posted on November 12, 2019
- Updated on May 7, 2024
- 9241 Views
This feature adds support for offloading BFD Transmit path to hardware (ASIC) for specific types of BFD sessions. This will improve accuracy of transmit timer implementations for BFD (especially with fast timers like 50 ms) and relieve pressure on the main CPU in scenarios of scale.
- Written by Rahul Vasist
- Posted on April 20, 2020
- Updated on January 29, 2024
- 9108 Views
EOS-4.24.0 adds support for hardware-accelerated sFlow on R3 systems. Without hardware acceleration, all sFlow processing is done in software, which means performance is heavily dependent on the capabilities of the host CPU. Aggressive sampling rates also decrease the amount of processing time available for other EOS applications.
- Written by Rajesh Velandy
- Posted on June 11, 2019
- Updated on September 5, 2019
- 9790 Views
Hardware counter feature allows enabling counters for features using programmable hardware counter resources.
- Written by Madhu Sudan
- Posted on June 21, 2020
- Updated on February 21, 2024
- 9659 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 Clay Miller
- Posted on June 5, 2020
- Updated on February 5, 2022
- 6098 Views
CALEA is the Communications Assistance for Law Enforcement Act which was passed into United States law
- Written by Shyam Kota
- Posted on June 5, 2020
- Updated on October 11, 2021
- 7167 Views
This feature implements RFC 3478. It allows devices to preserve the MPLS LDP LFIB entries in the forwarding plane if
- Written by Kenneth Cheung
- Posted on June 4, 2020
- Updated on October 16, 2023
- 8167 Views
On a MLAG chassis, MAC addresses learned on individual peers are synced and appropriate interfaces are mapped to these MAC addresses. In case of unexpected events like reloading of one of the peers in the MLAG chassis or flapping of one or more MLAG interfaces, some loss of traffic may be observed.
- Written by Pedro Coutinho
- Posted on June 4, 2020
- Updated on June 4, 2020
- 6946 Views
EOS version 4.24.1F introduces support for specifying multiple vias to form ECMP in MPLS static tunnels. A new
- Written by Prajakta Joshi
- Posted on November 6, 2019
- Updated on March 3, 2022
- 7571 Views
Multiprotocol Label Switching (MPLS) is a networking process that replaces complete network addresses with short
- Written by Aparna Karanjkar
- Posted on June 17, 2019
- Updated on May 3, 2024
- 9532 Views
EOS supports reading and streaming various OpenConfig configuration and state models over gNMI (gRPC Network Management Interface), RESTCONF, and NETCONF transports. A subset of the configuration models may also be modified over these transports
- Written by Sandeep Betha
- Posted on June 4, 2020
- Updated on June 4, 2020
- 6781 Views
Current EOS PIM sparse mode implementation installs an (S, G) route in the hardware whenever it receives an (S, G) join
- Written by Chris Roche
- Posted on December 16, 2019
- Updated on March 30, 2022
- 8298 Views
This feature introduces the support for OSPF routes over GRE tunnels under default as well as non-default VRFs. The feature is disabled by default.
- Written by Deeksha Srivastava
- Posted on June 3, 2020
- Updated on June 29, 2023
- 8989 Views
VRF Route leaking can be used when routes from one VRF are required in another VRF (e.g. in case of shared services). If VrfLeak Agent is being used to leak routes, the leaked routes (in destination VRF) can be redistributed into IGPs.
- Written by Zhen Xue
- Posted on June 29, 2020
- Updated on June 5, 2023
- 10221 Views
Bidirectional Forwarding Detection (BFD) is a protocol that provides low-overhead, short-duration detection of failures of arbitrary paths between two systems.
- Written by Haotian Zhang
- Posted on June 4, 2020
- Updated on May 31, 2024
- 8394 Views
This article describes the support for Filtered Mirroring using security ACL. The user can selectively mirror packets based on the statement in the configured IPv4, IPv6 or MAC ACL.
- Written by Manoharan Sundaramoorthy
- Posted on September 4, 2018
- Updated on February 5, 2022
- 13067 Views
Segment Routing Traffic Engineering Policy (SR TE) aka SR Policy makes use of Segment Routing (SR) to allow a headend
- Written by Gaofeng Yue
- Posted on June 3, 2020
- Updated on December 9, 2021
- 7006 Views
This feature introduces a metric for static routes so that the user can configure both administrative distance and
- Written by Bohan Yang
- Posted on August 28, 2019
- Updated on July 9, 2020
- 18150 Views
Due to hardware constraints on specific platforms, Ethernet interfaces are grouped together, within which their
- Written by Yongguang Xu
- Posted on June 3, 2020
- Updated on June 3, 2020
- 6212 Views
The IPv6 multicast route counters count packets and bytes per group, source and vrf . Every IPv6
- Written by Adrian Fettes
- Posted on June 5, 2020
- Updated on May 20, 2024
- 7268 Views
GRE ( Generic Routing Encapsulation ) packet header has a Key extension which is used by Arista to carry packet metadata. Currently packets mirrored at egress to a GRE tunnel destination do not have this information. This feature could be used to enable metadata in egress mirrored packets to GRE destinations.
- Written by Vishrant Vasavada
- Posted on June 10, 2020
- Updated on June 11, 2020
- 6564 Views
The CLI command “show rib route ip[ipv6]” and its sub commands (e.g. “show rib route ip
- Written by Brett Hatch
- Posted on June 5, 2020
- Updated on August 30, 2024
- 7807 Views
Static NAT rules may optionally include an access list to filter the packets to be translated.
- Written by Michelle Wang
- Posted on June 8, 2020
- Updated on July 21, 2023
- 7620 Views
EOS provides a way to extend its capabilities through the installation of extensions. An extension is a pre packaged
- Written by Sandeep Kopuri
- Posted on October 7, 2019
- Updated on October 24, 2024
- 10764 Views
Topology Independent Fast Reroute, or TI-LFA, uses IS-IS SR to build loop-free alternate paths along the post-convergence path. These loop-free alternates provide fast convergence.
- Written by Ioana Costea
- Posted on June 18, 2020
- Updated on June 18, 2020
- 6027 Views
Some users need to configure the source MAC on routed ports, in some cases.To achieve this,a new CLI configuration
- Written by Travis Hammond
- Posted on April 24, 2020
- Updated on January 17, 2022
- 6563 Views
TAP Aggregation support for the DCS 7280R3 and DCS 7500R3 series is documented below, including the release in which a
- Written by Anais Taing
- Posted on June 5, 2020
- Updated on October 30, 2024
- 7038 Views
In TAP Aggregation mode, configuration options are provided to handle special packet types. When receiving a packet whose Frame Check Sequence (FCS) is corrupted, the default behavior is to replace the bad FCS with the correct value and forward it. Configuration options are available to control the FCS behavior, such as to discard errors, pass through the bad FCS, or append a new FCS.
- Written by Vipul Shah
- Posted on August 27, 2019
- Updated on November 23, 2023
- 7087 Views
BGP routing information often contains more than one path to the same destination network. The BGP best-path selection algorithm determines which of these paths should be considered as the best path to that network.
- Written by Satish Kumar Selvaraj
- Posted on April 20, 2020
- Updated on December 9, 2021
- 5801 Views
TCB provides a mechanism to capture information around a MMU(Memory management unit) drop event.
- Written by Neel Neogi
- Posted on December 19, 2019
- Updated on December 21, 2021
- 8255 Views
Two rate three color marker (TrTCM) meters an incoming packet stream and marks the packets based on two rates, PIR
- Written by Shyam Kota
- Posted on June 14, 2019
- Updated on June 1, 2023
- 8318 Views
This article describes a set of CLI commands to create TCAM profiles. The profile is composed of a set of TCAM features, with each feature having customized lookup key, actions and packet types to hit.