- Written by Srinivasan Koona Lokabiraman
- Posted on June 3, 2020
- Updated on June 3, 2020
- 9458 Views
It is often useful to know on a per AFI/SAFI basis, the number of paths that have been selected from a peer as best paths.
- Written by Sameer Shah
- Posted on March 3, 2023
- Updated on March 16, 2023
- 7344 Views
This feature provides a mechanism to mark specific routes as resilient ECMP (RECMP) eligible using BGP RCF policies. A policy based mechanism provides a lot of flexibility in choosing the RECMP eligible routes using criteria such as:
- Written by Bhavin Patel
- Posted on March 24, 2020
- Updated on March 20, 2025
- 11617 Views
This feature allows failover to the backup path to occur in constant time per interface going down for features such as RSVP link protection, RSVP node protection, TI-LFA link protection, and BGP PIC. Without this feature enabled, it would take time proportional to the number of paths going over the interface experiencing the link down event to failover to the backup path. With this feature enabled, the failover time would be constant regardless of the number of paths.
- Written by Patrycja Kochmanska
- Posted on March 13, 2025
- Updated on March 13, 2025
- 238 Views
Currently when programming ECMP routes only one path is programmed in the kernel. There exists an environment variable (KERNELFIB_PROGRAM_ALL_ECMP) that allows users to program all paths from an ECMP route in the kernel. However, setting the variable requires restarting the KernelFib agent. This restart then reprograms all the routes.
- Written by Andrew Tran
- Posted on June 20, 2022
- Updated on June 29, 2022
- 8299 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.
- Written by Johnny Chen
- Posted on June 24, 2021
- Updated on May 9, 2024
- 13097 Views
ECMP Hash visibility CLI determines the output interface for an ECMP set based on the flow parameters supplied by the user. Ingress interface, source IP address, destination IP address and IP protocol are the required parameters.
- Written by Lavanya Conjeevaram
- Posted on June 29, 2016
- Updated on April 22, 2024
- 11211 Views
ECMP Hash visibility CLI determines the output interface for an ECMP set based on the flow parameters supplied by the user. Ingress interface, source IP address, destination IP address and IP protocol are the required parameters. L4 source and destination ports and VLAN identifier are optional, but should be specified if the packet has them.
- Written by Konrad Ciekot
- Posted on October 24, 2019
- Updated on October 24, 2019
- 11145 Views
As of 4.22.1F Load Balance Profiles can be used to explicitly configure ECMP Load Balance parameters. In addition,
- Written by Mattar Amith Kini
- Posted on December 27, 2024
- Updated on December 27, 2024
- 905 Views
This document describes the CLI introduced to reallocate ECMP FEC banks on different levels in a hierarchical FEC configuration. Users may run out of entries on a certain level with other levels having little to no usage, and this CLI reconfigures the ECMP FEC entries to meet the requirements of the user.
- Written by Feng Zhu
- Posted on May 7, 2024
- Updated on July 18, 2024
- 3356 Views
A forwarding equivalence class (FEC) entry is the data structure that holds all reachable vias where the packets should be sent to, for certain routes. Before this feature, a FEC could not contain both IPv4 next hop vias and IPv6 next hop vias. This feature starts supporting FECs that have both IPv4 next hop vias and IPv6 next hop vias. In an Equal Cost Multi-Path (ECMP) FEC, some of the vias may have IPv4 next hop and others may have IPv6 next hop.
- Written by Binglai Niu
- Posted on April 24, 2020
- Updated on July 9, 2024
- 9237 Views
On network devices, when a route is programmed, a certain portion of hardware resources is allocated and associated
- Written by Nathan Wolfe
- Posted on February 15, 2018
- Updated on November 7, 2024
- 13604 Views
Introduced in EOS-4.20.1F, “selectable hashing fields” feature controls whether a certain header’s field is used in the hash calculation for LAG and ECMP.
- Written by Pedro Coutinho
- Posted on June 4, 2020
- Updated on June 4, 2020
- 8295 Views
EOS version 4.24.1F introduces support for specifying multiple vias to form ECMP in MPLS static tunnels. A new
- Written by Ryan Halbrook
- Posted on June 28, 2021
- Updated on June 28, 2021
- 9573 Views
Multipath color is a new multicast multipath mode for controlling PIM RPF selection. In the default multipath
- Written by Emil Maric
- Posted on February 16, 2021
- Updated on July 8, 2024
- 9344 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 Kalash Nainwal
- Posted on December 14, 2020
- Updated on March 4, 2025
- 13935 Views
RSVP-TE, the Resource Reservation Protocol (RSVP) for Traffic Engineering (TE), is used to distribute MPLS labels for steering traffic and reserving bandwidth. The Label Edge Router (LER) feature implements the headend functionality, i.e., RSVP-TE tunnels can originate at an LER which can steer traffic into the tunnel.
- Written by Nikhil Goyal
- Posted on August 20, 2020
- Updated on August 20, 2020
- 7177 Views
This feature adds the support for learning multiple equal cost routes for a destination in the RIP protocol. This
- Written by Binglai Niu
- Posted on October 21, 2021
- Updated on October 21, 2021
- 8433 Views
Nexthop groups is a routing mechanism where users can configure a set of nexthops by specifying their nexthop
- Written by Sandeep Betha
- Posted on April 21, 2020
- Updated on April 27, 2020
- 8874 Views
In the ribd routing protocol model, the “maximum paths … ecmp …” command allows restricting the number of BGP