- Written by Deeksha Srivastava
- Posted on June 17, 2019
- Updated on June 20, 2019
- 7909 Views
This feature allows a user to configure Autonomous System Number (ASN) in Asdot notation and get the ASN in output of
- Written by Jonathan Kehler
- Posted on April 15, 2020
- Updated on April 15, 2020
- 6991 Views
Adds the ability to revert to previous behavior where BGP and static routes could resolve over BGP aggregates (when
- Written by Trevor Mendez
- Posted on March 31, 2017
- Updated on March 31, 2017
- 11500 Views
This feature is provided on all platforms. The BGP listen range command has been modified to optionally allow
- Written by Joanne Mikkelson
- Posted on March 8, 2024
- Updated on March 8, 2024
- 2681 Views
Prior to this feature, when the multi-agent routing protocol model was in use, the BGP agents (Bgp and, starting with 4.22.1F, BgpCliHelper) were always running, even if BGP was not configured. With this feature, these two BGP agents do not start up until BGP configuration is created with “router bgp <asn>”.
- Written by Ankush Sharma
- Posted on February 8, 2017
- Updated on February 9, 2017
- 6676 Views
The "set as path prepend" clause in route map configuration mode has been enhanced with the addition of the “last
- Written by Srinivasan Koona Lokabiraman
- Posted on June 3, 2020
- Updated on June 3, 2020
- 8257 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 Trevor Mendez
- Posted on December 20, 2021
- Updated on February 5, 2022
- 8617 Views
ACL based traffic management often requires matching packets’ destination addresses against one or more sets of
- Written by Francesco Belletti
- Posted on August 20, 2020
- Updated on August 20, 2020
- 7767 Views
This feature adds support for “Enhanced Route Refresh” capability (RFC7313). An enhanced route refresh is,
- Written by Pauric Ward
- Posted on August 23, 2022
- Updated on September 12, 2022
- 5931 Views
Stale routes are learned routes from adjacent BGP neighbors whose neighborship has been interrupted by session instability. This feature adds a mechanism to specify a stale policy route-map for which the stale routes from a gracefully restarting, or depending on the configuration of the feature, a non-gracefully restarting BGP peer will be processed.
- Written by Andrew Li
- Posted on August 31, 2023
- Updated on April 10, 2024
- 5404 Views
This feature enables Flowspec rules to be leaked from one VRF to another. When combined with the ability to apply Flowspec rules from one VRF to interfaces in another VRF, this feature makes it possible to combine rules from different source VRFs into a target VRF, and apply the target VRF’s rules on the interfaces of the source VRFs.
- Written by Vipul Shah
- Posted on March 13, 2020
- Updated on May 4, 2022
- 9188 Views
The goal of IAR operation is to minimize the CPU processing and churn in hardware by identifying a set of nexthop adjacencies such that updating those adjacencies in-place is sufficient to correctly forward the traffic quickly for all the affected routes.
- Written by Yoshihiro Ishijima
- Posted on September 12, 2024
- Updated on September 12, 2024
- 777 Views
BGP inbound update processing delay is a feature in EOS where an optional delay is applied prior to processing inbound UPDATE messages from a peer(s). The duration of the delay is configurable per peer. The delay is applied to UPDATE messages for all the address families that are negotiated with the peer. The delay timer starts when the peer becomes established. The routes from such peers are processed only after the timer expires. Any routes received after the timer expired are processed as usual without the delay. Both the default VRF and non-default VRFs are supported.
- Written by Yoshihiro Ishijima
- Posted on February 25, 2022
- Updated on June 12, 2023
- 7037 Views
This feature adds support for sending and receiving BGP IPv6 labeled-unicast routes with IPv4-mapped IPv6 next hops. With this feature enabled, when a BGP speaker receives a next hop with IPv4-mapped IPv6 address,
- Written by Prashanth Rajendran
- Posted on November 14, 2019
- Updated on November 15, 2019
- 8038 Views
This feature adds support for BGP peering over IPv6 link local addresses. This feature is available with the with the
- Written by Nandan Saha
- Posted on August 24, 2020
- Updated on May 22, 2024
- 11461 Views
The BGP-LS extension allows IGPs (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 Quentin L'Hours
- Posted on December 23, 2019
- Updated on December 23, 2019
- 8448 Views
In the multi agent routing protocol model, the Bgp agent now supports matching community lists with a logical OR via
- Written by Srinivasan Koona Lokabiraman
- Posted on February 17, 2021
- Updated on June 21, 2022
- 7379 Views
The BGP graceful restart mechanism has a limitation that the graceful restart time cannot exceed 4095 seconds per the
- Written by Qianchen Zhao
- Posted on December 20, 2019
- Updated on March 7, 2024
- 9533 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 Qin Zhang
- Posted on May 21, 2019
- Updated on September 5, 2019
- 8740 Views
BGP Monitoring Protocol (BMP) allows a monitoring station to connect to a router and collect all of the BGP
- Written by Paulo Panhoto
- Posted on September 3, 2021
- Updated on September 3, 2021
- 7728 Views
The route reflector, as described in RFC 4456, is a router allowed to advertise (reflect) iBGP learned routes to other
- Written by Dongliang Feng
- Posted on October 17, 2024
- Updated on October 17, 2024
- 417 Views
When a core router has competing advertisements for the same prefix from various PEs, the local edge route should be selected as the best path based on the IGP metric of the resolving routes of those competing advertisements. Without the support mentioned in this TOI, when a BGP route has two or more levels of recursion, the BGP process does not utilize the IGP distance in the route selection process.
- Written by Sandeep Betha
- Posted on January 22, 2021
- Updated on February 6, 2022
- 11481 Views
This feature adds support for user configured BGP Nexthop Resolution RIB profiles for various BGP based services
- Written by Manoj Agiwal
- Posted on September 30, 2015
- Updated on July 12, 2024
- 17651 Views
BGP Non Stop Forwarding (NSF) aims to minimize the traffic loss when the the following scenarios occur:
- Written by Jesper Skriver
- Posted on April 25, 2022
- Updated on July 10, 2024
- 7407 Views
Route reflectors are commonly used to distribute routes between BGP peers belonging to the same autonomous system. However, this can lead to non-optimal path selection. The reason for this is that the route reflector chooses the optimal route based on IGP cost from its perspective. This may not be optimal from the perspective of the client as its location may be different from the RR
- Written by Srinivasan Koona Lokabiraman
- Posted on August 25, 2020
- Updated on August 25, 2020
- 8117 Views
The BGP graceful restart mechanism has a limitation that the graceful restart time cannot exceed 4095 seconds as per
- Written by Peter Friend
- Posted on March 3, 2023
- Updated on March 16, 2023
- 5216 Views
Creating Traffic Policies that regulate control plane traffic from BGP peers by writing the list of BGP peer addresses statically in a field-set is error prone and difficult to update. Selecting only internal or external peers requires additional care. This feature automatically populates a field-set with IPv4 or IPv6 prefixes corresponding to iBGP or eBGP peers.
- Written by Yaonan Liang
- Posted on October 11, 2019
- Updated on October 11, 2019
- 7737 Views
BGP update wait for convergence feature prevents BGP from programming routes into hardware and advertising routes
- Written by Navneet Sinha
- Posted on June 29, 2016
- Updated on June 29, 2016
- 7401 Views
The sub route map configuration simplifies routing policies by sharing common policy across route maps. Common
- Written by Jason Shamberger
- Posted on April 20, 2020
- Updated on February 19, 2024
- 10889 Views
RPKI provides a mechanism to validate the originating AS of an advertised prefix.
- Written by Zhuang Liu
- Posted on June 25, 2021
- Updated on June 25, 2021
- 6632 Views
Remove Private AS Ingress is a feature used for removing and replacing private AS numbers from inbound AS paths, so
- Written by Lakshmi Yarramaneni
- Posted on June 13, 2019
- Updated on June 20, 2019
- 7231 Views
The replace remote AS feature allows a provider edge (PE) router to change the autonomous system (AS) number used by a
- Written by Charles Gibert
- Posted on June 13, 2019
- Updated on June 13, 2019
- 7318 Views
The “set as path prepend” clause in route map configuration mode has been enhanced with the addition of
- Written by Prashanth Rajendran
- Posted on March 16, 2021
- Updated on March 16, 2021
- 7042 Views
This feature adds support for BGP peering with multiple peers using the same IP address. The router id of those peers is
- Written by Joel Katticaran
- Posted on April 15, 2020
- Updated on April 16, 2020
- 12622 Views
This change adds a global toggle to BGP communities that allow for community sharing to be enabled/disabled for all
- Written by Feng Zhu
- Posted on January 3, 2023
- Updated on January 11, 2023
- 5517 Views
This feature monitors the BGP session status. When a BGP session goes down, traffic originally forwarded to the next hops learned from the downed BGP peer is quickly diverted to a backup path if any, or in the case of ECMP, remaining ECMP members.
- Written by Dongliang Feng
- Posted on June 20, 2022
- Updated on July 1, 2022
- 8496 Views
When a Provider Edge (PE) device loses BGP connectivity to the core (uplink) devices, it may be unable to forward any traffic from its downlink devices, typically CE (Customer Edge) devices. It is beneficial to indicate this connectivity loss to these CE devices so that they may find alternative paths to forward traffic.
- Written by Vishrant Vasavada
- Posted on November 12, 2019
- Updated on November 12, 2019
- 7243 Views
This feature implements support for RFC8203/BIS so that users can attach the reason of BGP instance or peer session
- Written by Vu Nguyen
- Posted on August 23, 2022
- Updated on November 22, 2023
- 7690 Views
EOS currently supports BGP message authentication via the TCP MD5 Signature (TCP MD5) option (RFC 2385) to protect the BGP sessions from spoofed TCP segments. However, research has shown many concerns that the TCP MD5 algorithm is cryptographically ineffective with a just simple keyed hash for authentication.
- Written by Keon Vafai
- Posted on June 22, 2020
- Updated on July 19, 2024
- 14334 Views
This feature adds support for BGP UCMP in the multi agent routing protocol model. The TOI for BGP UCMP in the ribd
- Written by Pintu Kumar
- Posted on June 17, 2019
- Updated on June 19, 2019
- 12019 Views
This feature extends the BGP Layer 3 VPN Import/Export and VRF Route Leaking functionality to “default” VRF.
- Written by Forhad Ahmed
- Posted on June 5, 2023
- Updated on June 7, 2023
- 4737 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. A BMP speaker may choose to send either pre-policy routes, post-policy routes, or both.
- Written by Forhad Ahmed
- Posted on April 19, 2022
- Updated on March 7, 2023
- 6793 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.
- Written by Bharath Somayaji
- Posted on April 25, 2022
- Updated on September 8, 2023
- 8749 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 Navneet Sinha
- Posted on June 29, 2016
- Updated on February 5, 2022
- 6766 Views
This feature provides the ability to track the reason why a BGP path is excluded from the BGP best path selection
- Written by Ajay Kini
- Posted on August 31, 2023
- Updated on September 8, 2023
- 4615 Views
BGP VPN routes today advertise a label by dynamically allocating it from a dynamic label range block without providing the user any control over the label value that is allocated per VRF’s address Family - VPNv4 or VPNv6. This feature allows the user to configure a unique label per VRF’s configured address-family, VPNv4 or VPNv6, thereby allowing the user granular control over the label value advertised with VPN routes exported from a VRF.
- Written by Saurav Arora
- Posted on June 20, 2022
- Updated on June 28, 2022
- 6463 Views
The “maximum-paths <m>” (default m=1) configuration that controls BGP’s multipath behavior, is available as a global knob, and not as a peer/peer-group knob today in EOS. When “maximum-paths” CLI is configured with m > 1, BGP starts forming ECMP groups for paths with similar attributes received from all configured neighbors.
- Written by Denis Evoy
- Posted on August 20, 2020
- Updated on August 20, 2020
- 13450 Views
In a Service Provider network, a Provider Edge (PE) device learns VPN paths from remote PEs and uses the Route Target
- Written by Promise Nnogharam
- Posted on April 16, 2024
- Updated on April 16, 2024
- 3160 Views
Routing control functions (RCF) is a new language, a different way of policy definition and application in a programmatic fashion (https://www.arista.com/en/support/toi/eos-4-27-2f/15102-routing-control-functions-language-and-configuration). EOS Application Programmable Interface (eAPI) is another means whereby commands are sent to the switch (i.e. aside from the switch’s command-line interface - CLI which has been the norm), which can be executed through various methods like web interface, shell or a program/script.
- Written by Lavanya Conjeevaram
- Posted on June 29, 2016
- Updated on June 29, 2016
- 6776 Views
The eBgp "ip next hop unchanged" feature allows a router to send routes to its eBgp peers without changing their next
- Written by Amit Ranpise
- Posted on November 11, 2019
- Updated on May 10, 2024
- 12770 Views
As described in the Multi-VTEP MLAG TOI, singly connected hosts can lead to suboptimal peer-link utilization. By adding a local VTEP to each MLAG peer, the control plane is able to advertise singly connected hosts as being directly behind a specific local VTEP / MLAG peer.