- Written by Alex Volinsky
- Posted on 4月 30, 2021
- Updated on 6月 11, 2021
- 7621 Views
400GBASE ZR transceiver is the industry’s first multi vendor DWDM standard, a Digital Coherent Optical module
- Written by Graeme Rennie
- Posted on 3月 31, 2017
- Updated on 4月 18, 2022
- 7610 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 8月 24, 2020
- Updated on 7月 3, 2024
- 23705 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 12月 22, 2017
- Updated on 9月 25, 2023
- 13262 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 4月 30, 2021
- Updated on 4月 30, 2021
- 4998 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 2月 16, 2021
- Updated on 2月 22, 2021
- 6770 Views
BFD (Bidirectional Forwarding Detection) session telemetry allows for the collection of per session statistics as
- Written by Joseph Swaminathan
- Posted on 2月 24, 2021
- Updated on 2月 5, 2022
- 5644 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 3月 11, 2020
- Updated on 4月 18, 2024
- 14590 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 2月 17, 2021
- Updated on 6月 21, 2022
- 6561 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 9月 30, 2015
- Updated on 7月 12, 2024
- 16191 Views
BGP Non Stop Forwarding (NSF) aims to minimize the traffic loss when the the following scenarios occur:
- Written by Prashanth Rajendran
- Posted on 3月 16, 2021
- Updated on 3月 16, 2021
- 6326 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 4月 7, 2021
- Updated on 9月 13, 2023
- 8137 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 2月 17, 2021
- Updated on 10月 21, 2022
- 10150 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 4月 7, 2021
- Updated on 4月 2, 2024
- 8295 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 2月 17, 2021
- Updated on 7月 10, 2024
- 6244 Views
The Dot1x Dropped Counters count the packets that get dropped for dot1x interfaces. The following
- Written by Shyam Kota
- Posted on 8月 16, 2018
- Updated on 8月 25, 2022
- 7318 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 2月 16, 2021
- Updated on 2月 16, 2021
- 6672 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 8月 21, 2020
- Updated on 5月 7, 2024
- 8280 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 10月 9, 2018
- Updated on 12月 5, 2023
- 17656 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 3月 9, 2021
- Updated on 12月 1, 2023
- 10376 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 2月 18, 2021
- Updated on 11月 17, 2021
- 8321 Views
Arista campus switches allow extensive and fine grained hardware based flow tracking and management features. They
- Written by Jonathan Kehler
- Posted on 1月 22, 2019
- Updated on 10月 19, 2021
- 6127 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 2月 17, 2021
- Updated on 2月 17, 2021
- 5347 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 2月 23, 2021
- Updated on 2月 5, 2022
- 6086 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 4月 22, 2021
- Updated on 4月 22, 2021
- 11075 Views
InfluxDB telemetry streaming feature enables telemetry data collection with Telegraf on box, and allows streaming
- Written by Ramakrishnan G
- Posted on 4月 18, 2018
- Updated on 6月 22, 2022
- 8194 Views
The L2EVPN MPLS feature is available when configuring BGP in the multi agent routing protocol model.
- Written by Ramakrishnan G
- Posted on 2月 23, 2021
- Updated on 6月 22, 2022
- 6389 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 10月 22, 2018
- Updated on 6月 7, 2023
- 12687 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 3月 17, 2021
- Updated on 5月 11, 2022
- 6175 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 2月 22, 2021
- Updated on 11月 7, 2022
- 7129 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 3月 2, 2021
- Updated on 6月 19, 2023
- 8373 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 6月 29, 2016
- Updated on 11月 3, 2022
- 7743 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 7月 22, 2020
- Updated on 6月 27, 2022
- 10976 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 3月 17, 2021
- Updated on 3月 17, 2021
- 5897 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 11月 2, 2020
- Updated on 7月 3, 2023
- 7179 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 12月 16, 2019
- Updated on 3月 30, 2022
- 7717 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 2月 23, 2022
- Updated on 6月 2, 2022
- 6303 Views
This feature provides isolation and allows segregating/dividing the link state database based on interface.
- Written by Conor Hopkins
- Posted on 3月 16, 2021
- Updated on 3月 16, 2021
- 6792 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 3月 24, 2021
- Updated on 3月 30, 2021
- 6773 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 2月 16, 2021
- Updated on 7月 8, 2024
- 6995 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 9月 16, 2020
- Updated on 1月 11, 2022
- 8366 Views
RSVP TE, the Resource Reservation Protocol (RSVP) for Traffic Engineering (TE), is used to distribute MPLS labels
- Written by Jeevan Kamisetty
- Posted on 2月 26, 2021
- Updated on 7月 18, 2023
- 10131 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 6月 4, 2020
- Updated on 5月 31, 2024
- 7764 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 3月 5, 2021
- Updated on 5月 30, 2024
- 10666 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 2月 19, 2021
- Updated on 2月 19, 2021
- 7253 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 2月 19, 2021
- Updated on 6月 26, 2023
- 8317 Views
Storm control enables traffic policing on floods of packets on L2 switching networks. The documentation describes
- Written by Matthew Carrington-Fair
- Posted on 2月 22, 2021
- Updated on 5月 6, 2021
- 7157 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 2月 22, 2021
- Updated on 6月 24, 2022
- 6762 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 3月 17, 2021
- Updated on 3月 17, 2021
- 6012 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 2月 23, 2021
- Updated on 4月 18, 2024
- 6639 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.