- Written by Abdul Haseeb Jehangir
- Posted on 10月 20, 2022
- Updated on 10月 21, 2022
- 1555 Views
Starting EOS-4.29.0F, 64-bit EOS image is supported on low-profile (4 GB) memory systems. Please refer to platform compatibility and known limitations below. The supported scale of features depends on the configuration present in the system. Customers can continue using the 32-bit version of EOS image as before.
- Written by Digvijay Gahlot
- Posted on 4月 20, 2021
- Updated on 1月 23, 2023
- 4636 Views
The L2 EVPN MPLS feature is available when configuring BGP in the multi-agent routing protocol model. Ethernet VPN (EVPN) is an extension of the BGP protocol introducing a new address family: L2VPN (address family number 25) / EVPN (subsequent address family number 70). It is used to exchange overlay MAC and IP address reachability information between BGP peers.
- Written by Tarun Jaswanth LNU
- Posted on 8月 24, 2020
- Updated on 3月 16, 2023
- 9007 Views
802.1X is an IEEE standard protocol that prevents unauthorized devices from gaining access to the network.
- Written by Tarun Jaswanth LNU
- Posted on 10月 20, 2022
- Updated on 11月 3, 2022
- 969 Views
As per the mechanism suggested for MKA protocol, a new SAK generation, distribution and installation in all members of a connectivity association ( CA ) can be thought of happening in a number of steps
- Written by Neil Jarvis
- Posted on 3月 6, 2020
- Updated on 10月 27, 2022
- 3846 Views
Ingress policing provides the ability to monitor the data rates for a particular class of traffic and perform action when traffic exceeds user-configured values. This allows users to control ingress bandwidth based on packet classification. Ingress policing is done by a policing meter which marks incoming traffic and performs actions based on the results of policing meters.
- Written by Bharath Somayaji
- Posted on 4月 25, 2022
- Updated on 10月 28, 2022
- 2309 Views
Class Based Forwarding (CBF) is a means for steering IP traffic into colored tunnels based on the ingress DSCP values. CBF may be used with SR-TE Policy or RSVP-TE colored tunnels.
- Written by Augusto Wong
- Posted on 2月 17, 2021
- Updated on 10月 21, 2022
- 4037 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 Huong Nguyen
- Posted on 11月 13, 2019
- Updated on 11月 7, 2022
- 4592 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 Praveen Kumar Yadav
- Posted on 10月 20, 2022
- Updated on 10月 26, 2022
- 967 Views
In the 7280R3/7500R3/7800R3 platform, EXP rewrite for IP-MPLS routed flows is derived from the DSCP of the packet. Using Qos Policy map , DSCP can be set as needed. But in this process, the egress IP TOS was also changed, which may cause issues later at customer edge.
- Written by Sahil Midha
- Posted on 6月 14, 2019
- Updated on 10月 25, 2022
- 2814 Views
This feature can be divided into 3 parts. Enable support for different threshold per Color per TX queue We
- Written by Jeevan Kamisetty
- Posted on 8月 23, 2022
- Updated on 3月 29, 2023
- 2202 Views
AVA switch sensor aka “monitor security awake” feature provides deep network analysis by doing deep packet inspection of some or all packets of traffic that's forwarded by the switch. It continuously monitors enterprise devices, users, and applications wherever they are, even as IP addresses change while maintaining a forensic record of past activities. This functionality can be enabled/disabled on the fly without impacting regular packet forwarding functionality.
- Written by Dylan Walsh
- Posted on 10月 20, 2022
- Updated on 4月 20, 2023
- 1219 Views
EosSdkRpc is an agent built on top of the Arista EOS SDK. It uses gRPC as a mechanism to provide remote access to the EOS SDK. The gRPC interface that EosSdkRpc supports closely matches the interface provided by EOS SDK, and the intent is that the .proto interface can be publically supported.
- Written by Vamsi Anne
- Posted on 10月 20, 2022
- Updated on 11月 9, 2022
- 1339 Views
As Ethernet technologies made their way into the Metropolitan Area Networks (MAN) and the Wide Area Networks (WAN) from the conventional enterprise level usage, they are now widely being used by service providers to provide end-to-end connectivity to customers. Such service provider networks are typically spread across large geographical areas. Additionally, the service providers themselves may be relying on certain internet backbone providers, referred to as “operators”, to provide connectivity in case the geographical area to be covered is too huge.
- Written by Chris Hydon
- Posted on 10月 20, 2022
- Updated on 4月 13, 2023
- 1429 Views
In EVPN, an overlay index is a field in type-5 IP Prefix routes that indicates that they should resolve indirectly rather than using resolution information contained in the type-5 route itself. Depending on the type of overlay index, this resolution information may come from type-1 auto discovery or type-2 MAC+IP routes. For this feature the gateway IP address field of the type-5 NLRI is used as the overlay index, which matches the target IPv4 / IPv6 address in the type-2 NLRI.
- Written by Christoph Schwarz
- Posted on 8月 23, 2022
- Updated on 10月 21, 2022
- 1511 Views
Flexible cross-connect service is an extension of EVPN MPLS Virtual Private Wire Service (VPWS) (RFC 8214). It allows for multiplexing multiple attachment circuits across different Ethernet Segments and physical interfaces into a single EVPN VPWS service tunnel while still providing single-active and all-active multi-homing.
- Written by Edwin Tambi
- Posted on 8月 19, 2020
- Updated on 12月 8, 2022
- 6552 Views
EOS supports the ability to match on a single VLAN tag (example: encapsulation dot1q vlan 10) or a VLAN tag pair (example: encapsulation dot1q vlan 10 inner 20) to map matching packets to an interface. In this case, the encapsulation string is considered consumed by the mapped interface before forwarding, which means that the tags are effectively removed from the incoming packet for the purposes of any downstream forwarding.
- Written by Gowtham Rameshkumar
- Posted on 6月 10, 2019
- Updated on 10月 31, 2022
- 2879 Views
An introduction to Nexthop-groups can be seen in the Nexthop-Group section of eos.With this feature, IP packets matching a static Nexthop-Group route can be encapsulated with a GRE tunnel and forwarded.
- Written by Ashwani Deva Kumar
- Posted on 10月 20, 2022
- Updated on 10月 20, 2022
- 1203 Views
This feature allows the logging of the packets matching permit rules in ingress ACLs. This behavior can be enabled by using the log keyword when configuring an ACL permit rule. A copy of the packet matching those ACL rules is sent to the control plane, where a syslog entry of the packet header is being generated.
- Written by Tanuj Kumar Jhamb
- Posted on 10月 20, 2022
- Updated on 1月 9, 2023
- 1240 Views
sFlow is a sampling technique which monitors the incoming traffic on all the interfaces without affecting the network performance.
- Written by Neel Neogi
- Posted on 12月 30, 2020
- Updated on 3月 29, 2023
- 4023 Views
The document describes the support for dedicated and group ingress policing on interfaces without using QoS policy-maps to match on the traffic and apply policing.
- Written by Jyothish Kunkumath
- Posted on 1月 6, 2022
- Updated on 10月 25, 2022
- 3748 Views
IPSec tunnel mode support allows the customer to encrypt traffic transiting between two tunnel endpoints.
- Written by Soumya S Acharya
- Posted on 10月 20, 2022
- Updated on 4月 21, 2023
- 171 Views
This feature helps in figuring out if there are multiple nodes in the network with the same System-ID. A non-unique node leads to the failure of all subsequent functions of the IS-IS protocol, like LSP origination (leading to LSP constant flooding issue), SPF calculation and so on.
- Written by Navneet Sinha
- Posted on 6月 29, 2016
- Updated on 1月 11, 2023
- 5097 Views
IS IS SR feature provides knobs to configure various types of segments which are distributed as part of IS IS LSPs (Link
- Written by Prakrati Vidyarthi
- Posted on 8月 16, 2018
- Updated on 1月 9, 2023
- 5468 Views
Normally, a switch traps L2 protocol frames to the CPU. However, certain use-cases may require these frames to be forwarded.
- Written by Michael Chin
- Posted on 2月 22, 2021
- Updated on 11月 7, 2022
- 2687 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 John Clarke
- Posted on 12月 20, 2021
- Updated on 10月 21, 2022
- 3577 Views
Arista's 7130 Connect Series of Layer 1+ switches are powerful network devices designed for ultra low latency and offer a wealth of integrated management features and functionalities.
- Written by Alejandro Schwoykoski
- Posted on 12月 22, 2021
- Updated on 11月 7, 2022
- 3098 Views
MetaMux is an FPGA-based feature available on Arista’s 7130 platforms. It performs ultra-low latency Ethernet packet multiplexing with or without packet contention queuing. The port to port latency is a function of the selected MetaMux profile, front panel ingress port, front panel egress port, FPGA connector ingress port, and platform being used.
- Written by Ryan Megathlin
- Posted on 10月 20, 2022
- Updated on 11月 3, 2022
- 1231 Views
In order to achieve split horizon and prevent double-delivery of packets in an MLAG setup, egress ACLs are installed on all active MLAG interfaces so that BUM traffic received on the MLAG peer-link cannot get forwarded out any MLAG interfaces. When only one half of an MLAG interface is active, this egress ACL is removed to allow BUM traffic from the peer-link to be forwarded out MLAG interfaces.
- Written by Anil Joshi
- Posted on 6月 29, 2016
- Updated on 11月 3, 2022
- 2929 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 Marius
- Posted on 10月 20, 2022
- Updated on 1月 13, 2023
- 982 Views
Before 4.29.0F, the next hop self option could only be configured for a neighbor in global router mode and would apply to all address families. Attempting to configure next-hop-self in address family mode would silently move the configuration to global mode (for the specified neighbor).
- Written by Ethan Vadai
- Posted on 3月 6, 2020
- Updated on 10月 21, 2022
- 5544 Views
Policy based routing (PBR) is a feature that is applied on routable ports, to preferentially route packets.
- Written by Padmanabh Ratnakar
- Posted on 4月 20, 2021
- Updated on 3月 2, 2023
- 4734 Views
The postcard telemetry(GreenT - GRE Encapsulated Telemetry) feature is used to gather per flow telemetry information like path and per hop latency.
- Written by Fathima Thasneem
- Posted on 6月 20, 2022
- Updated on 11月 7, 2022
- 1898 Views
RFC2544 defines a number of benchmark tests that may be used to describe the performance characteristics of a network interconnecting device(s). Starting from 4.28.1F, Arista switches support throughput test belonging to a set of benchmark tests as defined in RFC2544. Starting from 4.29.0F, Arista switches support frame loss rate test.
- Written by David Cronin
- Posted on 3月 3, 2022
- Updated on 3月 16, 2023
- 5147 Views
Routing control functions (RCF) is a language that can be used to express route filtering and attribute modification logic in a powerful and programmatic fashion.
- Written by David Cronin
- Posted on 3月 4, 2022
- Updated on 1月 11, 2023
- 3849 Views
Routing control functions (RCF) is a language that can be used to express route filtering and attribute modification logic in a powerful and programmatic fashion.
- Written by Jeevan Kamisetty
- Posted on 2月 26, 2021
- Updated on 10月 26, 2022
- 3660 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 Jeevan Kamisetty
- Posted on 11月 4, 2020
- Updated on 11月 9, 2022
- 4750 Views
Network administrators require access to flow information that passes through various network elements, for the purpose of analyzing and monitoring their networks. This feature provides access to IP flow information by sampling traffic flows in ingress and/or egress directions on the interfaces on which it is configured.
- Written by Joseph Swaminathan
- Posted on 10月 20, 2022
- Updated on 10月 28, 2022
- 960 Views
This feature allows a SBFD initiator to request a SBFD reflector to respond to the status of an auxiliary path. This is very useful when an SBFD session couldn’t be established with an endpoint. In such a case the SBFD initiator could establish a session to a router in the path ( ex. ASBR ) to respond to the health of the remaining path ( ex. endpoint connected to the ASBR ).
- Written by Zhen Xue
- Posted on 6月 29, 2020
- Updated on 10月 27, 2022
- 3488 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 Naina Jalan
- Posted on 10月 20, 2022
- Updated on 11月 3, 2022
- 1087 Views
Unicast Reverse Path Forwarding (uRPF) can help limit malicious IPv4/IPv6 traffic on a network. uRPF works by enabling the router to verify reachability (routing) of the source IP address (SIP) in the packet being forwarded. If the SIP is determined to be an invalid address, the packet is dropped.
- Written by Daniel Guerin
- Posted on 10月 20, 2022
- Updated on 11月 3, 2022
- 967 Views
Spanning Tree Protocol requires each interface to have a unique port number ranging from 1 through 4095. Arista STP typically assigns port numbers to port-channel interfaces in the order in which they are configured.
- Written by Jason Shamberger
- Posted on 3月 11, 2020
- Updated on 11月 3, 2022
- 6028 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 Shamit Kapadia
- Posted on 10月 20, 2022
- Updated on 10月 26, 2022
- 1001 Views
BGP Monitoring Protocol (BMP) allows a monitoring station to connect to a router and collect all of the BGP announcements received from the router’s BGP peers. The announcements are sent to the station in the form of BMP Route Monitoring messages generated from path information in the router’s BGP Adj-Rib-In tables.
- Written by Surendra Mobiya
- Posted on 10月 20, 2022
- Updated on 10月 21, 2022
- 1087 Views
This feature adds support for “Dynamic Load Balancing (DLB)” on Link Aggregation Group (LAG). It is intended to help overcome the potential shortcomings of traditional hash-based load balancing by considering the traffic load of members of LAG groups.
- Written by Neil Jarvis
- Posted on 3月 2, 2022
- Updated on 3月 7, 2023
- 2733 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 Bidong Chen
- Posted on 10月 20, 2022
- Updated on 1月 17, 2023
- 1183 Views
This feature enables Tap Aggregation generic header removal on a tap port.
- Written by Sandeep Kopuri
- Posted on 10月 7, 2019
- Updated on 10月 25, 2022
- 3828 Views
Topology Independent Fast Reroute, or TI LFA, uses IS IS SR to build loop free alternate paths along the post
- Written by Prateek Mali
- Posted on 8月 19, 2020
- Updated on 3月 15, 2023
- 7185 Views
Access Control Lists (ACL) use packet classification to mark certain packets going through the packet processor pipeline and then take configured action against them. Rules are defined based on various fields of packets and usually TCAM is used to match packets to rules. For example, there can be a rule to match the packet source IP address against a list of IP addresses, and drop the packet if there is a match. This will be expressed in TCAM with multiple entries matching the list of IP addresses. Number of entries is reduced by masking off bits, if possible. TCAM is a limited resource, so with classifiers having a large number of rules and a big field list, TCAM runs out of resources.
- Written by Graeme Rennie
- Posted on 10月 20, 2022
- Updated on 10月 25, 2022
- 1100 Views
Internal recirculation interfaces, IR interfaces, can be used to internally loop-back packets for a second pass through the packet forwarding pipeline. This is particularly useful with Tap Aggregation because some combinations of advanced Tap Aggregation features cannot be simultaneously applied to a packet. Using an IR interface however, a user can apply multiple Tap Aggregation egress editing features, overcoming previous limitations.
- Written by Anirudh Ramesh Iyer
- Posted on 5月 5, 2021
- Updated on 1月 11, 2023
- 6802 Views
This article describes how to customize TCAM ( Ternary Content Addressable Memory ) lookup for each feature which uses TCAM.