- Written by Thippanna Hongal
- Posted on December 17, 2024
- Updated on December 18, 2024
- 1900 Views
OSPFv3 distribute-list is a policy construct to filter out routes received from OSPFv3 LSAs so that they will not be installed on the router even though the routes are resolved and are installable. The filtering is performed after SPF calculation and only on routes from received LSAs, not on self-originated LSAs. This feature does not affect the OSPFv3 protocol behavior of the router. LSAs are exchanged, e.g. flooded, even if the routes are not installed locally on the router.
- Written by Tanushree Bansal
- Posted on November 22, 2017
- Updated on December 22, 2017
- 8093 Views
EOS release 4.20.1F adds OSPFv3 flood pacing support that allows configuring the minimum interval between the
- Written by Rachee Singh
- Posted on September 30, 2015
- Updated on September 30, 2015
- 8122 Views
In previous releases of EOS, Stub area and NSSA area types were supported for OSPFv3, but without support of the "no
- Written by Saurabh Kumar
- Posted on October 24, 2024
- Updated on October 24, 2024
- 2441 Views
Today in any WAN deployment, customers are required to configure path metrics in load balance policy to program a set of best paths in dataplane. Path metrics are multi-dimensional, it include loss, latency, jitter, and load of path. It is not very intuitive to come up with exact values for these metrics as they are highly dependent on the type of application and geographical locations of routers. Also these path metrics keep changing and except for a few apps that require strict max characteristics on latency, jitter or loss, the other apps are able to tolerate variances in metrics.
- Written by Lavanya Conjeevaram
- Posted on March 31, 2017
- Updated on April 3, 2017
- 9403 Views
Overlay IPv6 routing over VXLAN Tunnel is simply routing IPv6 packets in and out of VXLAN Tunnels, similar to
- Written by Aditi Vaidya
- Posted on August 23, 2019
- Updated on February 4, 2022
- 9034 Views
This document describes a few enhancements done in Wireless Manager (WM) release 8.8 in respect of AP firmware
- Written by Robert Rada
- Posted on April 22, 2024
- Updated on January 8, 2025
- 4311 Views
By default, the scheduling between parent interfaces and the attached shaped subinterfaces is done in strict priority mode where the parent interface has higher priority than shaped subinterfaces. Subinterfaces that are not shaped use the same queues as the parent so the traffic on these subinterfaces will also have strict priority over shaped subinterfaces.
- Written by Dhruba Jyoti Pokhrel
- Posted on February 20, 2023
- Updated on February 20, 2023
- 6279 Views
With the 14.0 release, you can add device passwords and AP-Server Key passphrase as defined in the password policy. The passwords are based on the password policy and password settings that you configure in CV-CUE.
- Written by Mihyar Baroudi
- Posted on December 8, 2015
- Updated on May 29, 2019
- 8452 Views
This feature provides the capability to mirror special L2 control frames, called the Pause or Priority Flow Control
- Written by Anoop Dawani
- Posted on September 30, 2015
- Updated on July 13, 2018
- 9088 Views
Policy Based Routing (PBR) provides the flexibility of routing according to custom defined policies in a way that
- Written by Brandon Edgren
- Posted on May 1, 2015
- Updated on May 1, 2015
- 7108 Views
Prior to EOS 14.15.0F, if a single packet hit both a PBR and an ACL rule, then only the hardware counters corresponding
- Written by Lavanya Conjeevaram
- Posted on June 29, 2016
- Updated on March 29, 2018
- 9565 Views
The per port per VLAN feature allows application of QoS policies for IP, IPv6 and non IP traffic on a per port per VLAN
- Written by Ahirnish Pareek
- Posted on February 8, 2017
- Updated on February 6, 2022
- 8143 Views
DCS 7010T. DCS 7050X. DCS 7250X. DCS 7260X. DCS 7280E, DCS 7280R. DCS 7300X. DCS 7320X. DCS 7500E,
- Written by Kushagra Mohan
- Posted on March 18, 2020
- Updated on December 20, 2024
- 10679 Views
This feature enables per port TC-To-COS mapping, where TC represents Traffic-Class and COS represents Vlan tag PCP bits. While at present there is a global TC-To-COS mapping, we can use the TC-To-COS feature to create custom profiles which can be applied to the required interfaces.
- Written by Lavanya Conjeevaram
- Posted on June 29, 2016
- Updated on June 29, 2016
- 9366 Views
Per VLAN MAC Learning is a feature to enable/disable mac learning per vlan instead of per port. Using this feature with
- Written by Prashant Kumar
- Posted on April 30, 2025
- Updated on April 30, 2025
- 760 Views
Policy-map counters can be configured to display per-interface counters for all class-maps attached to all successfully programmed policy-maps. The feature is not enabled by default and has to be configured through the command line interface. When enabled, the output of the show command will display both per-interface and aggregate counters.
- Written by Johnny Chen
- Posted on April 25, 2022
- Updated on January 22, 2025
- 9831 Views
The Per-MAC ACL feature provides the functionality to apply an IPv4/IPv6 ACL to a 802.1x supplicant instead of applying them on the port that the supplicant is behind. This allows for more flexible and specific traffic policies to be defined for supplicants trying to access certain resources on the network.
- Written by Radek Szymanski
- Posted on December 24, 2024
- Updated on January 20, 2025
- 1968 Views
The software for Syslog, NTP and SNMP used in EOS resolves hostnames at service start-up. It’s possible that during service operation, the configured host becomes unavailable and the configuration needs to be set to a different host to continue the service. The problem is that such change requires manual restart of the service. Even if the hostname doesn’t change and only the underlying address is updated at the DNS server, the administrator has to manually reset service configuration.
- Written by Sahil Midha
- Posted on May 1, 2015
- Updated on May 20, 2015
- 7468 Views
Permitting traffic during ACL updates has been available for traffic steering in tap aggregation mode since EOS
- Written by Siva Kumar
- Posted on October 14, 2024
- Updated on October 14, 2024
- 2287 Views
Hosts in a branch need to access internet bound services. In traditional deployments, edge routers in branches are connected to the internet via WAN port. To secure the internal network from the internet we have ACLs( Access Control Lists ) to filter the traffic in/out from the WAN port. If we want to filter the traffic into the port we have ingress ACL, egress ACL filters the traffic out of the port. By default, without any ACL configuration present on the WAN port, we accept every traffic coming to the WAN port.
- Written by Rajat Jain
- Posted on February 8, 2017
- Updated on February 4, 2022
- 9234 Views
PFC (Priority based Flow Control) is a flow control mechanism used in RDMA environments. PFC provides a link level
- Written by Veluchamy Dinakaran
- Posted on September 30, 2015
- Updated on September 30, 2015
- 8748 Views
This feature enables detection of egress queues that are unable to transmit packets for prolonged periods of time
- Written by Mukund PB
- Posted on June 20, 2022
- Updated on May 8, 2025
- 9358 Views
Priority Flow Control (PFC) Watchdog feature monitors interfaces for priority-flow-control Pause storm. If such a storm is detected on no-drop enabled priorities, it takes actions such as:
- Written by Mihyar Baroudi
- Posted on December 8, 2015
- Updated on June 14, 2019
- 9180 Views
DCS 7050X/X2/X3 series. DCS 7060X/X2/X3 series. In previous releases, PFC Watchdog supported only queues
- Written by Rahul Kumar Singh
- Posted on August 18, 2022
- Updated on October 11, 2024
- 11163 Views
This article is intended to discuss how to configure the Phone VLAN on an Arista switch.
- Written by Neeraj Joseph
- Posted on April 23, 2018
- Updated on October 17, 2024
- 10740 Views
The PHY test pattern CLI can be used to check the quality of the physical layer for an Ethernet interface. This is done by
- Written by Sandeep Betha
- Posted on January 31, 2022
- Updated on February 25, 2025
- 15570 Views
PIM External Gateways (PEGs) allow an EVPN overlay multicast network to interface with an external PIM domain. They can be used to interconnect two data centers using an external PIM domain in between them.
- Written by Padmini Misra
- Posted on September 30, 2015
- Updated on September 30, 2015
- 9052 Views
PIM VRF feature adds VRF support to these existing multicast protocols: PIM SM, PIM BSR, IGMP and MSDP.
- Written by Santosh Kumar
- Posted on December 22, 2017
- Updated on May 2, 2024
- 9448 Views
PIM Static Source Discovery (SSD) is a feature implemented as part of PIM-SM. Familiarity with setting up and configuring PIM-SM (Sparse Mode) and PIM-SSM (Source-Specific Multicast) is assumed.
- Written by Prachi Modi
- Posted on May 8, 2025
- Updated on May 8, 2025
- 339 Views
With the 19.0 release of CV-CUE, you can place the switches on the floor map by dragging them on the floor map.
- Written by Lavanya Conjeevaram
- Posted on June 29, 2016
- Updated on February 8, 2017
- 8552 Views
Ingress policing on front panel ports is supported on DCS 7010X and DCS 7050X since EOS4.14.0F. When ingress policing
- Written by Jaffar Hameedabdul
- Posted on November 22, 2017
- Updated on November 22, 2017
- 8340 Views
Traffic is managed through policy maps that apply data shaping methods to specific data streams. A policy map is a data
- Written by Sambath Kumar Balasubramanian
- Posted on December 20, 2024
- Updated on April 11, 2025
- 2434 Views
EOS provides support for the use of IPsec to establish and maintain IPsec tunnels. This feature adds support for redirecting traffic matching on traffic policy rules to an IPSec tunnel.
- Written by Sahil Midha
- Posted on February 8, 2017
- Updated on February 7, 2022
- 8275 Views
QoS profiles have been applicable on fabric and front panel ports across all platforms from EOS 4.17.0F release
- Written by Satya Viswanathan
- Posted on April 22, 2015
- Updated on July 2, 2015
- 7848 Views
Policy Based Routing (PBR) is a feature that is applied on routable ports, to preferentially route packets. This is
- Written by Ryan Izard
- Posted on April 23, 2025
- Updated on April 23, 2025
- 896 Views
In previous versions, the DMF Controller had a hidden CLI command to change the log level from INFO to WARN for a particular port down log in the DMF Controller. This hidden command has been removed in DMF 8.7.0. The following is an example of the hidden command:
- Written by Gabor
- Posted on April 18, 2024
- Updated on May 22, 2025
- 6153 Views
Port mirroring is used to send a copy of packets seen on one port to a network monitoring connection on another switch port. Port mirroring is commonly used with network probes or other monitoring devices; examples include intrusion detection devices, latency analyzers, or packet capture and protocol analysis tools.
- Written by Mihyar Baroudi
- Posted on December 8, 2015
- Updated on December 21, 2015
- 9726 Views
Port Security: Protect mode (PortSec Protect) is newly added to the Port Security feature and is designed to restrict
- Written by Ioana Costea
- Posted on April 25, 2025
- Updated on April 25, 2025
- 1036 Views
Introduced in the 4.34.0F release, the maximum links feature allows users to specify the number of active members in both LACP and static port-channels. If active members become inactive due to configuration changes or link failure, previously restricted members can become active. This ensures the port-channel remains operational, preventing disruptions even if all initial active members fail.
- Written by Utkarsha Verma
- Posted on June 29, 2016
- Updated on June 29, 2016
- 8270 Views
Port Channel member status logging on Arista switches allows logging of Ethernet interfaces joining or leaving a
- Written by Padmanabh Ratnakar
- Posted on April 20, 2021
- Updated on March 5, 2025
- 16726 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 Tom Meng
- Posted on November 11, 2019
- Updated on May 7, 2025
- 9055 Views
Power management is a way to limit the total available power to be used for Power over Ethernet (PoE) ports. Without power management, the total amount of power that the power supply units (PSU) are able to provide is used. Power management can be used to create power redundancies. For example, if a system has 2 1050W PSUs, the feature can set the total available power to be 800W for PoE. With this configuration, 1 PSU is sufficient to power the system and the unused PSU acts as a backup source, thus giving the system a 1+1 redundancy.
- Written by Julie Powell
- Posted on October 23, 2024
- Updated on October 23, 2024
- 2295 Views
View PTP counters to identify the types of messages being sent and received by PTP-enabled devices. Use this to troubleshoot issues with your network PTP configuration and connectivity. When announce and sync messages are present but delay request messages are missing, for instance, it may suggest that a host is having trouble locking to the boundary clock.
- Written by Eric Lanini
- Posted on March 3, 2023
- Updated on October 11, 2024
- 7094 Views
Precoding is used to help reduce the burst error length of DFE (Decision Feedback Equalizer) error events with PAM-4 modulation
- Written by Cong Du
- Posted on April 13, 2015
- Updated on May 1, 2015
- 7340 Views
Starting EOS 4.15.0F, a BGP route reflector can preserve the BGP attributes (next hop, local preference and metric)
- Written by Corey Hines
- Posted on August 17, 2018
- Updated on November 19, 2024
- 11460 Views
Priority Flow Control is a link-layer flow control mechanism which may be used by an overwhelmed network node to ask its transmitters to stop transmission for a specified period of time. It does so by using special frames known as PFC frames, thus, relieving congestion at the receiver node. With respect to this behavior, PFC is very similar to Link Layer Flow Control ( LLFC ), however, unlike LLFC, PFC allows the overwhelmed node to specify which 802.1Q Class of Service ( CoS ) it wants to stop receiving traffic for. Thus, allowing differentiated treatment of traffic based on CoS.
- Written by Julie Powell
- Posted on July 25, 2024
- Updated on July 25, 2024
- 3121 Views
Provisioning Settings allows you to configure CloudVision's default behavior when pushing configuration and image changes to devices. Each setting relates to an action used in Change Control. Ordinarily you should only need to use the default settings, but you can alter them for more control over CloudVision and EOS interactions for devices in your network.
- Written by Vivek Ilangovan
- Posted on October 24, 2024
- Updated on October 24, 2024
- 2379 Views
Proxy node segment helps in advertising segments in a segment-routing domain for prefixes that are originated outside the segment-routing domain. Node B in the SR domain can advertise proxy-segments to node A for the loopacks of C and D which are not present in the SR domain. This feature will help in creating mpls routes for those loopbacks on node B. Note that if C and D loopbacks have LDP enabled and if they have exchanged the LDP labels with B then B can by default create a SR to LDP stitched mpls route even without enabling this feature. This feature is specific to the case where such stitched routes cannot be created.
- Written by Matt Murray
- Posted on May 1, 2015
- Updated on February 5, 2022
- 4450 Views
This document describes the enhancements to Arista's IEEE 1588 PTP implementation introduced in EOS 4.15.0F.
- Written by Julie Powell
- Posted on July 25, 2024
- Updated on July 25, 2024
- 3176 Views
CloudVision provides more than 20 overlay options to help you visualize the properties of network devices, interfaces, and links. Use the PTP overlay to visualize the topology of PTP enabled devices and their links. At a glance, you can see which device in a PTP domain is the grandmaster and which devices belong to a PTP domain.