Here is a juniper example

set protocols bgp group iBGP-reflector-v4 family inet unicast add-path receive

set protocols bgp group iBGP-reflector-v4 family inet unicast add-path send prefix-policy addPathiBGPPolicyASBR

set protocols bgp group iBGP-reflector-v4 family inet unicast add-path send path-count 3

addPathiBGPPolicyASBR could be as simple as ‘accept all’ or something more granular.

Richard I think addressed this a few weeks back; consider the potential growth of your RIB and recognize that the feature to preinstall the backup path in your FIB, if possible on your hardware, may be a different knob.

-Michael

From: MICE Discuss <MICE-DISCUSS@LISTS.IPHOUSE.NET> On Behalf Of David Farmer
Sent: Thursday, January 11, 2024 1:29 PM
To: MICE-DISCUSS@LISTS.IPHOUSE.NET
Subject: Re: [MICE-DISCUSS] BGP ADD-PATH capability

Here are a couple of Cisco Docs

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/xe-16/irg-xe-16-book/bgp-additional-paths.html

https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/217097-bgp-path-selection-in-ios-xr.html

Hope that helps;

On Thu, Jan 11, 2024 at 11:04 AM Jonathan Stewart <jonathan@les.net> wrote:

Does anyone--like another IX, possibly--have documentation that can be shared about how to enable, disable, or ignore the add-path configuration on the member router?

Farmer mentions they didn't have it enabled suggesting each operator would need to enable add-path on their router before the functionality could be used by each member.

Thanks,
Jonathan
Jonathan Stewart
Network Engineer
LES.NET - AS18451
Desk: 1-204-666-6191
Mobile: 1-204-990-2120
130 Portage Avenue E
Winnipeg, MB  R3C 0A1
CANADA
On Wed, 2024-01-10 11:08 p.m., David Farmer wrote:
I'll add while we are receiving the Additional-Path BGP Capability from RS1, we don't have it enabled on our side, so it is not being negotiated.

Thanks
On Wed, Jan 10, 2024 at 8:33 PM Richard Laager <rlaager@wiktel.com> wrote:
Today, the University of Minnesota tested with me. I enabled "add paths tx" on one of their sessions and it worked.
-- 
Richard
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David Farmer    Email:farmer@umn.edu
Networking & Telecommunication Services
Office of Information Technology
University of Minnesota
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David Farmer    Email:farmer@umn.edu
Networking & Telecommunication Services
Office of Information Technology
University of Minnesota
2218 University Ave SE Phone: 612-626-0815
Minneapolis, MN 55414-3029   Cell: 612-812-9952
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