- Written by Prateek Mali
- Posted on August 19, 2020
- Updated on February 28, 2024
- 15630 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 Dana Cook
- Posted on March 3, 2023
- Updated on March 3, 2023
- 2822 Views
The MPLS LFIB counters feature was enhanced to add support for counting labels that correspond to VRF termination labels. The full details of the MPLS LFIB counters feature can be found in the original
- Written by Abhiram Kalluru
- Posted on March 3, 2023
- Updated on March 20, 2023
- 3036 Views
This feature introduces a flag to indicate to a gNMI client that the FIB (forwarding information base) or IPv4/IPv6 unicast AFT (abstract forwarding table) have converged and the snapshot is consistent with the device.
- Written by Matthew Carrington-Fair
- Posted on March 3, 2023
- Updated on November 7, 2023
- 2798 Views
This feature allows IP FIB (Forwarding Information Base) export through the OpenConfig AFT YANG models.
- Written by Prasanna Parthasarathy
- Posted on December 23, 2021
- Updated on February 7, 2024
- 9881 Views
SwitchApp is an FPGA based feature available on Arista’s 7130LB-Series and 7132LB-Series platforms. It performs ultra low latency Ethernet packet switching. The port to port latency is a function of the selected SwitchApp profile. Detailed latency measurements are available in the userguide on the Arista Support site.
- Written by Charlotte Fedderly
- Posted on June 20, 2022
- Updated on May 26, 2023
- 4140 Views
Synchronous Ethernet (SyncE) provides support for frequency synchronization over Ethernet between devices traceable to an external frequency reference, like a primary reference clock, as specified in ITU G.8261.
- Written by Stefan Kheraj
- Posted on March 3, 2023
- Updated on March 14, 2024
- 2567 Views
Support for independently editing packets copied to multiple tool interfaces.
A Tap Aggregation steering policy can redirect and replicate incoming traffic streams, as well as apply various packet editing actions, e.g., VLAN identity tagging, MAC address rewrite, timestamping, header removal, etc.
- Written by Shyam Kota
- Posted on June 14, 2019
- Updated on June 1, 2023
- 7301 Views
This article describes a set of CLI commands to create TCAM profiles. The profile is composed of a set of TCAM features, with each feature having customized lookup key, actions and packet types to hit.
- Written by Isidor Kouvelas
- Posted on February 28, 2022
- Updated on February 2, 2024
- 11327 Views
Virtual Private LAN Service (VPLS) appears in (almost) all respects as an Ethernet type service to customers of a Service Provider (SP). A VPLS glues together several individual LANs across a packet switched network to appear and function as a single bridged LAN.
- Written by Srinivasan Rammoorthy Mahalingam
- Posted on March 3, 2023
- Updated on March 3, 2023
- 2888 Views
This article describes the support of a VLAN filter for IP, IPV6 and MAC ACLs on the ingress ports. The users will be able to filter the packets by specifying a VLAN id in the ACL rule. VLAN id specified in the ACL rule is internal broadcast domain VLAN id.