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[mc36 <>]

> (xr lifted this recently, whereas it's still true for xe and rare/freerouter)


c8000v-1(config)#router bgp 1
c8000v-1(config-router)#address-family ipv4 unicast
c8000v-1(config-router-af)#neighbor 1.1.1.1 send-label ?
  explicit-null  Advertise Explicit Null label in place of Implicit Null
  <cr>           <cr>

c80000v-1(config-router-af)#neighbor 1.1.1.1 send-label

so this knob is what "converts" this peering from ipv4 unicast to ipv4 
labeled unicast, and obviously it's set or not... :)

rare/freertr used the neighbor 1.1.1.1 address-family knob whta controls, but 
the safis are similarly exclusive, only one of them is accepted:

sid#configure
sid(cfg)#router bgp4 123 vrf v3
sid(cfg-rtr)#neighbor 1.1.1.1 remote-as 321
sid(cfg-rtr)#neighbor 1.1.1.1 address-family unicast labeled
sid(cfg-rtr)#show running-config this
router bgp4 123 vrf v3
 neighbor 1.1.1.1 remote-as 321
 neighbor 1.1.1.1 address-family labeled
 exit
!

sid(cfg-rtr)#