- Written by Alex Volinsky
- Posted on April 30, 2021
- Updated on June 11, 2021
- 8228 Views
400GBASE ZR transceiver is the industry’s first multi vendor DWDM standard, a Digital Coherent Optical module
- Written by Graeme Rennie
- Posted on March 31, 2017
- Updated on April 18, 2022
- 8163 Views
This article describes a feature for Tap Aggregation mode, which strips IEEE 802.1BR E-Tag and Cisco VN-Tag headers from all tagged packets received on tap interface before delivering them out of tool interfaces.
- Written by Tarun Jaswanth LNU
- Posted on August 24, 2020
- Updated on October 17, 2024
- 25409 Views
802.1X is an IEEE standard protocol that prevents unauthorized devices from gaining access to the network.
- Written by Michael (Mike) Fink
- Posted on December 22, 2017
- Updated on September 25, 2023
- 13895 Views
Filtered Mirroring allows certain packets to be selected for mirroring, rather than all packets ingressing or egressing a particular port.
- Written by Vaibhav Gaiha
- Posted on April 30, 2021
- Updated on April 30, 2021
- 5461 Views
This feature allows the global configuration, "allow non ect or non ect packet thresholds" along with "set drop
- Written by Will Rideout
- Posted on February 16, 2021
- Updated on February 22, 2021
- 7281 Views
BFD (Bidirectional Forwarding Detection) session telemetry allows for the collection of per session statistics as
- Written by Joseph Swaminathan
- Posted on February 24, 2021
- Updated on February 5, 2022
- 6169 Views
BGP Add Path TX allows for a BGP speaker to advertise multiple paths (instead of a single best path) for a prefix towards
- Written by Jason Shamberger
- Posted on March 11, 2020
- Updated on April 18, 2024
- 15626 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 Srinivasan Koona Lokabiraman
- Posted on February 17, 2021
- Updated on June 21, 2022
- 7110 Views
The BGP graceful restart mechanism has a limitation that the graceful restart time cannot exceed 4095 seconds per the
- Written by Manoj Agiwal
- Posted on September 30, 2015
- Updated on July 12, 2024
- 17261 Views
BGP Non Stop Forwarding (NSF) aims to minimize the traffic loss when the the following scenarios occur:
- Written by Prashanth Rajendran
- Posted on March 16, 2021
- Updated on March 16, 2021
- 6798 Views
This feature adds support for BGP peering with multiple peers using the same IP address. The router id of those peers is
- Written by Diego Asturias
- Posted on April 7, 2021
- Updated on September 13, 2023
- 8822 Views
CLI extension allows for custom CLIs commands/modes to be defined in EOS. It also integrates with EOS SDK to be able to control a daemon’s configuration and read a daemon’s status from the CLI command handlers. This feature is intended to have more customization compared to the “daemon cli” feature, which only allows for key/value pairs as cli commands, and doesn’t allow for custom CLI commands. It does this by using a statically defined YAML file that contains the daemon definition (EOS SDK or not), CLI mode, and CLI commands, very much akin to what is provided by the via configuration in the daemon cli mode.
- Written by Augusto Wong
- Posted on February 17, 2021
- Updated on October 21, 2022
- 10878 Views
DHCP Relay feature forwards DHCP packets between client and server when the DHCP Server is not in the same broadcast domain as the client. DHCP Relay should be configured on the gateway interface (SVI/ L3 interface ) for the clients. DHCP Relay agent creates a new unicast DHCP packet and sets the giaddr field to the ‘primary’ IP address of the interface on which DHCP request packet is received. The modified request packet is then relayed to one or more configured DHCP servers. DHCP server assigns ip address to client from the pool corresponding to giaddr field.
- Written by VICTOR WEN
- Posted on April 7, 2021
- Updated on April 2, 2024
- 9030 Views
EOS supports the DHCP Relay feature, which relays DHCP Requests/Responses between DHCP clients and DHCP servers in different subnets.
- Written by Yongguang Xu
- Posted on February 17, 2021
- Updated on July 10, 2024
- 6772 Views
The Dot1x Dropped Counters count the packets that get dropped for dot1x interfaces. The following
- Written by Kulwinder Singh
- Posted on August 16, 2018
- Updated on September 12, 2024
- 7901 Views
The feature allows to create a named TC to DSCP mapping that can be applied on an interface.DSCP of routed packets egressing out of the interface will be rewritten according to the map.
- Written by Pawel Kurdybacha
- Posted on February 16, 2021
- Updated on February 16, 2021
- 7191 Views
The feature allows assigning of class E addresses to interfaces by default with no option to turn that off and routing
- Written by Kaushik Kumar Ram
- Posted on August 21, 2020
- Updated on October 17, 2024
- 8947 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, decap capability of GUE packets of variant 1 header format has been added. This variant allows direct encapsulation using the UDP header without the GUE header. The inner payload could be one of IPv4, IPv6, or MPLS.
- Written by Sudheer Y R
- Posted on October 9, 2018
- Updated on December 5, 2023
- 18748 Views
This feature introduces the hardware forwarding support for IPv4 over IPv4, GRE-Tunnel interfaces on Arista Switches. A GRE-Tunnel interface acts as a logical interface which performs the GRE encapsulation or decapsulation.
- Written by Aman Aman-Ul-Haq
- Posted on March 9, 2021
- Updated on December 1, 2023
- 10956 Views
The Segment security feature provides the convenience of applying policies on segments rather than interfaces or subnets. Hosts/networks are classified into segments based on prefixes. Grouping prefixes into segments allows for definition of policies that govern flow of traffic between segments.
- Written by Utkarsha Verma
- Posted on February 18, 2021
- Updated on November 17, 2021
- 8921 Views
Arista campus switches allow extensive and fine grained hardware based flow tracking and management features. They
- Written by Jonathan Kehler
- Posted on January 22, 2019
- Updated on October 19, 2021
- 6674 Views
This feature introduces the ability to match on 1) any BGP aggregate contributor or 2) a specific BGP aggregate’s
- Written by Romeyo Dsouza
- Posted on February 17, 2021
- Updated on February 17, 2021
- 5831 Views
EOS 4.25.2F adds support for IS IS, OSPF and OSPFv3 Graceful Restart (GR) on unplanned software restarts for all
- Written by Shamit Kapadia
- Posted on February 23, 2021
- Updated on February 5, 2022
- 6565 Views
In EVPN deployment with VXLAN underlay when an EVPN type 5 prefix is imported into an IP VRF, the IGP cost of the underlay
- Written by Andy Cheng
- Posted on April 22, 2021
- Updated on April 22, 2021
- 11778 Views
InfluxDB telemetry streaming feature enables telemetry data collection with Telegraf on box, and allows streaming
- Written by Ramakrishnan G
- Posted on April 18, 2018
- Updated on June 22, 2022
- 8758 Views
The L2EVPN MPLS feature is available when configuring BGP in the multi agent routing protocol model.
- Written by Ramakrishnan G
- Posted on February 23, 2021
- Updated on June 22, 2022
- 6924 Views
In a multihomed EVPN MPLS configuration, BUM packets sent from a non-designated forwarder (Non-DF) PE to a designated forwarder (DF) PE must carry ESI label advertised by the egress DF PE.
- Written by Athichart Tangpong
- Posted on October 22, 2018
- Updated on October 1, 2024
- 13376 Views
A L2 sub-interface is a logical bridging endpoint associated with traffic on an interface distinguished by 802.1Q tags, where each <interface, 802.1q tag> tuple is treated as a first class bridging interface.
- Written by VIKAS NARAYANAPPA
- Posted on March 17, 2021
- Updated on May 11, 2022
- 6669 Views
If a network device uses deep packet inspection for load balancing, RFC6790 recommends deployments to use entropy label in LDP to improve load balancing in MPLS networks by providing sufficient entropy in the label stack itself.
- Written by Michael Chin
- Posted on February 22, 2021
- Updated on October 28, 2024
- 7702 Views
Line system commands are used to apply configuration and query the status of line system modules in EOS. The supported line system modules are the OSFP-AMP-ZR and the QSFP-AMP-ZR.
- Written by Yashvir Singh
- Posted on March 2, 2021
- Updated on June 19, 2023
- 8915 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 Anil Joshi
- Posted on June 29, 2016
- Updated on November 3, 2022
- 8292 Views
MPLS-over-GRE encapsulation support in EOS 4.17.0 enables tunneling IPv4 packets over MPLS over GRE tunnels. This feature leverages next-hop group support in EOS. With this feature, IPv4 routes may be resolved via MPLS-over-GRE next-hop group to be able to push one MPLS label and then GRE encapsulate the resulting labelled IPv4 packet before sending out of the egress interface.
- Written by Binoshmon T B
- Posted on July 22, 2020
- Updated on June 27, 2022
- 11682 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 Paul Fallon
- Posted on March 17, 2021
- Updated on March 17, 2021
- 6361 Views
For an octal port such as a QSFPDD or OSFP, this feature renumbers the ports on a system to have 4 configurable
- Written by Ajay Kini
- Posted on November 2, 2020
- Updated on July 3, 2023
- 7812 Views
In a symmetric network topology, for the same ECMP (Equal Cost Multi Path) route programmed at different devices in a switch layer, the various devices can program ECMP next hops in the FEC (Forwarding Equivalence Class) for that route in varying orders.
- Written by Chris Roche
- Posted on December 16, 2019
- Updated on March 30, 2022
- 8286 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 Tanushree Bansal
- Posted on February 23, 2022
- Updated on June 2, 2022
- 6827 Views
This feature provides isolation and allows segregating/dividing the link state database based on interface.
- Written by Conor Hopkins
- Posted on March 16, 2021
- Updated on March 16, 2021
- 7338 Views
The current behaviour on R series products is to drop all packets marked for drop by the chip Packet Processor in the
- Written by Nikhil Satish Pai
- Posted on March 24, 2021
- Updated on March 30, 2021
- 7271 Views
This feature may be used for redistributing OSPFv2 leaked and non leaked routes from one instance to another when
- Written by Emil Maric
- Posted on February 16, 2021
- Updated on July 8, 2024
- 7538 Views
Routes covered by a resilient equal-cost multi-path (RECMP) prefix are types of routes that make use of hardware tables dedicated for equal-cost multi-path (ECMP) routing. Resilient ECMP deduping is a new feature wherein the switch will reactively attempt to reduce the number of ECMP hardware table entries allocated by forcing routes that share the same set of next hops but point to different hardware table entries to point to the same hardware table entry when hardware resource utilization is high. Forcing RECMP routes to change the hardware table entry that they point to may potentially cause a traffic flow disruption for any existing flows going over that route. The deduping process will attempt to minimize the amount of potential traffic loss caused.
- Written by Martin Stigge
- Posted on September 16, 2020
- Updated on January 11, 2022
- 8934 Views
RSVP TE, the Resource Reservation Protocol (RSVP) for Traffic Engineering (TE), is used to distribute MPLS labels
- Written by Jeevan Kamisetty
- Posted on February 26, 2021
- Updated on July 18, 2023
- 10777 Views
Sampled flow tracking with IPFIX export is supported on most of the Arista platforms. User configured sampling rate is used for sampling in ingress and/or egress direction on the configured interfaces. An EOS software agent on CPU processes samples received from hardware, samples are used to create flow records that are exported to IPFIX collectors. Refer to Sampled flow tracking TOI for additional details.
- Written by Haotian Zhang
- Posted on June 4, 2020
- Updated on May 31, 2024
- 8382 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 Athish Rao
- Posted on March 5, 2021
- Updated on May 30, 2024
- 11394 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 Yongxiang Chen
- Posted on February 19, 2021
- Updated on February 19, 2021
- 7779 Views
4.25.2F introduces storm control with packet per second support in the platforms listed below. TOI describing the
- Written by Yongxiang Chen
- Posted on February 19, 2021
- Updated on June 26, 2023
- 8962 Views
Storm control enables traffic policing on floods of packets on L2 switching networks. The documentation describes
- Written by Matthew Carrington-Fair
- Posted on February 22, 2021
- Updated on May 6, 2021
- 7676 Views
Prior to 4.25.2F, support for BGP PIC was restricted to locally identifiable failures such as link failures. If a
- Written by Yongguang Xu
- Posted on February 22, 2021
- Updated on September 23, 2024
- 7327 Views
The multicast route counters count packets and bytes per group, source and vrf. Every multicast route will be counted when the feature is turned on if there are sufficient hardware counter resources available.
- Written by Sushil Yadav
- Posted on March 17, 2021
- Updated on March 17, 2021
- 6486 Views
By default, sFlow samples that are generated have a fixed size: 128 bytes. This feature adds support for a
- Written by Patrick MacArthur
- Posted on February 23, 2021
- Updated on April 18, 2024
- 7220 Views
Sub-interfaces can be grouped into logical units called scheduling groups, which are shaped as a single unit. Each scheduling group may be assigned a scheduling policy which defines a shape rate in kbps and optionally a guaranteed bandwidth, also in kbps.