Tag :: TOI

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.

Overlay IPv6 routing over VXLAN Tunnel is simply routing IPv6 packets in and out of VXLAN Tunnels, similar to

This document describes a few enhancements done in Wireless Manager (WM) release 8.8 in respect of  AP firmware

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.

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.

This feature provides the capability to mirror special L2 control frames, called the Pause or Priority Flow Control

Policy Based Routing (PBR) provides the flexibility of routing according to custom defined policies in a way that

Prior to EOS 14.15.0F, if a single packet hit both a PBR and an ACL rule, then only the hardware counters corresponding

The per port per VLAN feature allows application of QoS policies for IP, IPv6 and non IP traffic on a per port per VLAN

DCS 7010T. DCS 7050X. DCS 7250X. DCS 7260X. DCS 7280E, DCS 7280R. DCS 7300X. DCS 7320X. DCS 7500E,

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. 

Per VLAN MAC Learning is a feature to enable/disable mac learning per vlan instead of per port. Using this feature with

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.

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.

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.

Permitting traffic during ACL updates has been available for traffic steering in tap aggregation mode since EOS

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.

PFC (Priority based Flow Control) is a flow control mechanism used in RDMA environments. PFC provides a link level

This feature enables detection of egress queues that are unable to transmit packets for prolonged periods of time

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:

DCS 7050X/X2/X3 series. DCS 7060X/X2/X3 series. In previous releases, PFC Watchdog supported only queues

This article is intended to discuss how to configure the Phone VLAN on an Arista switch.

The PHY test pattern CLI can be used to check the quality of the physical layer for an Ethernet interface. This is done by

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.

PIM VRF feature adds VRF support to these existing multicast protocols: PIM SM, PIM BSR, IGMP and MSDP.

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.

With the 19.0 release of CV-CUE, you can place the switches on the floor map by dragging them on the floor map.

Ingress policing on front panel ports is supported on DCS 7010X and DCS 7050X since EOS4.14.0F. When ingress policing

Traffic is managed through policy maps that apply data shaping methods to specific data streams. A policy map is a data

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.

QoS profiles have been applicable on fabric and front panel ports across all platforms from EOS 4.17.0F release

Policy Based Routing (PBR) is a feature that is applied on routable ports, to preferentially route packets.  This is

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:

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.

Port Security: Protect mode (PortSec Protect) is newly added to the Port Security feature and is designed to restrict

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.

Port Channel member status logging on Arista switches allows logging of Ethernet interfaces joining or leaving a

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.

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.

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.

Precoding is used to help reduce the burst error length of DFE (Decision Feedback Equalizer) error events with PAM-4 modulation

Starting EOS 4.15.0F, a BGP route reflector can preserve the BGP attributes (next hop, local preference and metric)

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.

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. 

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.

This document describes the enhancements to Arista's IEEE 1588 PTP implementation introduced in EOS 4.15.0F.

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.

This feature makes ARP and ND packets use a higher priority output queue when software forwarded on the switch. Doing

Since, now there can be multiple inputs, conflicts may arise. Non conflicting configurations are when non default

QSFP+ modules that support TX power DOM will now display the reported TX power value via show interfaces transceiver.