- Written by Nandan Saha
- Posted on August 24, 2020
- Updated on July 11, 2023
- 4542 Views
The BGP-LS extension allows IGP (OSPF/IS-IS) link state database information to be injected into BGP. This is typically used in deployments where some external component, (like a controller or Path Computation Engine) can do centralized path computations by learning the entire IGP topology through BGP-LS. The controller can then communicate the computed paths based on the BGP-LS updates to the head end device in the network. The mechanism used by the controller to communicate the computed TE paths is outside the scope of this document. Using BGP-LS instead of an IGP peering with the controller to distribute IGP link state information has the following advantages.
- Written by Kundan Sen
- Posted on August 23, 2019
- Updated on September 5, 2019
- 2819 Views
EOS 4.22.1F adds support for disabling the IS IS authentication check for received IS IS PDUs. By enabling this
- Written by Arpit Bansal
- Posted on December 21, 2020
- Updated on January 17, 2022
- 3884 Views
IGP shortcuts enable traffic to get forwarded along traffic engineered paths computed by RSVP using a modified SPF
- Written by Tanushree Bansal
- Posted on June 11, 2019
- Updated on June 20, 2019
- 2916 Views
This feature implements RFC6119, which allows the extension of IS IS protocol to carry IPv6 Traffic Engineering
- Written by Tony Li
- Posted on December 22, 2020
- Updated on December 22, 2020
- 3116 Views
IS IS area proxy allows the creation of more scalable networks. IS IS already has hierarchical mechanisms for
- Written by Nitin Sao
- Posted on November 9, 2021
- Updated on November 9, 2021
- 2734 Views
This feature allows configuration of the IS IS CSNP generation interval. The default CSNP interval is 10
- Written by Sarah Chen
- Posted on January 12, 2022
- Updated on September 8, 2023
- 4175 Views
IS-IS flexible algorithm (FlexAlgo) provides a lightweight, simplified mechanism for performing basic traffic engineering functions within a single IS-IS area. FlexAlgo requires the cooperation of all nodes within the IS-IS area but does not require an external controller. Paths are computed by each node within the area, resulting in an MPLS switched forwarding path to nodes that are advertising a node Segment Identifier (SID) for the algorithm. The results of the path computation are placed in the colored tunnel RIB or system tunnel RIB, which simplifies route resolution.
- Written by Chris Roche
- Posted on April 20, 2020
- Updated on April 26, 2021
- 2884 Views
The IS IS maximum LSP size feature provides the ability to configure the maximum LSP size that the IS IS protocol will
- Written by Arpit Bansal
- Posted on August 18, 2020
- Updated on August 18, 2020
- 2944 Views
Level 1 2 routers set attached bit in their Level 1 LSPs to indicate their reachability to the rest of the network. A
- Written by Pintu Kumar
- Posted on April 23, 2018
- Updated on February 24, 2023
- 3511 Views
Traffic Engineering (TE) provides a mechanism to network administrators to control the path that a data packet takes, bypassing the standard routing model which uses routes along the shortest path. Traffic engineered paths are generally computed on the head-end routers of the topology based on various constraints (e.g. minimum bandwidth, affinity) configured for those paths and attributes (e.g available bandwidth, color) received from devices in the network topology.
- Written by Manoj Agiwal
- Posted on September 30, 2019
- Updated on September 30, 2019
- 2853 Views
This feature allows a user to configure multiple static adjacency SIDs for an IS IS adjacency. This feature is an
- Written by Girish Dasari
- Posted on May 11, 2021
- Updated on May 11, 2021
- 2840 Views
IS IS adjacency is not formed between devices with different address families configured. For example, a router
- Written by Saurav Arora
- Posted on January 7, 2022
- Updated on January 7, 2022
- 2877 Views
Traffic steering enables traffic for a specified set of prefixes to get forwarded along traffic engineered paths
- Written by Kundan Sen
- Posted on August 18, 2022
- Updated on August 22, 2022
- 1839 Views
This feature adds support for configuring multiple area addresses in an IS-IS instance.
- Written by Sandeep Kopuri
- Posted on October 7, 2019
- Updated on August 31, 2023
- 5019 Views
Topology Independent Fast Reroute, or TI-LFA, uses IS-IS SR to build loop-free alternate paths along the post-convergence path. These loop-free alternates provide fast convergence.
- Written by Kundan Sen
- Posted on November 12, 2019
- Updated on November 12, 2019
- 2565 Views
EOS 4.23.0F adds support for redistributing DHCPv6 routes in IS IS when using the multi agent routing protocol mode.