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https://datatracker.ietf.org/doc/html/draft-abraitis-bgp-version-capability Working example with FRR ``` % ./gobgp neighbor 192.168.10.124 BGP neighbor is 192.168.10.124, remote AS 65001 BGP version 4, remote router ID 200.200.200.202 BGP state = ESTABLISHED, up for 00:01:14 BGP OutQ = 0, Flops = 0 Hold time is 3, keepalive interval is 1 seconds Configured hold time is 90, keepalive interval is 30 seconds Neighbor capabilities: multiprotocol: ipv6-unicast: advertised ipv4-unicast: advertised and received route-refresh: advertised and received extended-nexthop: advertised Local: nlri: ipv4-unicast, nexthop: ipv6 UnknownCapability(6): received UnknownCapability(9): received graceful-restart: advertised and received Local: restart time 10 sec ipv6-unicast ipv4-unicast Remote: restart time 120 sec, notification flag set ipv4-unicast, forward flag set 4-octet-as: advertised and received add-path: received Remote: ipv4-unicast: receive enhanced-route-refresh: received long-lived-graceful-restart: advertised and received Local: ipv6-unicast, restart time 10 sec ipv4-unicast, restart time 20 sec Remote: ipv4-unicast, restart time 0 sec, forward flag set fqdn: advertised and received Local: name: donatas-pc, domain: Remote: name: spine1-debian-11, domain: software-version: advertised and received Local: GoBGP/3.10.0 Remote: FRRouting/8.5-dev-MyOwnFRRVersion-gdc92f44a4 cisco-route-refresh: received Message statistics: ``` FRR side: ``` root@spine1-debian-11:~# vtysh -c 'show bgp neighbor 192.168.10.17 json' | \ > jq '."192.168.10.17".neighborCapabilities.softwareVersion.receivedSoftwareVersion' "GoBGP/3.10.0" root@spine1-debian-11:~# ``` Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>