To enable external connectivity, you can configure the default-originate attribute when you create or update BGP peer (IPv4 and IPv6).
By default, default-originate is disabled.
efa tenant service bgp peer create --name <bgp-peer-name> --tenant <tenant-name> 
           		--ipv4-uc-nbr <device-ip,vrf-name:neighbor-ip,remote-asn> 
           		--ipv4-uc-nbr-bfd <device-ip,vrf-name:neighbor-ip,true|false> 
          		 --ipv4-uc-nbr-default-originate <device-ip,vrf-name:neighbor-ip,true/false>
           		--ipv4-uc-nbr-default-originate-route-map <device-ip,vrf-name:neighbor-ip,route-map>
                efa tenant service bgp peer update --name <bgp-peer-name> --tenant <tenant-name> 
           		--operation peer-add
           		--ipv4-uc-nbr <device-ip,vrf-name:neighbor-ip,remote-asn> 
           		--ipv4-uc-nbr-bfd <device-ip,vrf-name:neighbor-ip,true|false> 
           		--ipv4-uc-nbr-default-originate <device-ip,vrf-name:neighbor-ip,true/false>
           		--ipv4-uc-nbr-default-originate-route-map <device-ip,vrf-name:neighbor-ip,route-map>
                    
Note
Theipv4-uc-nbr-default-originate-route-map attribute
                            is an optional attribute.efa tenant service bgp peer create --name ten1bgppeer1 --tenant tenant11 --ipv4-uc-nbr 10.20.246.3,v1:10.20.30.40,50000 --ipv4-uc-nbr-bfd 10.20.246.3,v1:10.20.30.40,true --ipv4-uc-nbr-default-originate 10.20.246.3,v1:10.20.30.40,true --ipv4-uc-nbr 10.20.246.4,v1:10.20.30.40,50000 --ipv4-uc-nbr-bfd 10.20.246.4,v1:10.20.30.40,true --ipv4-uc-nbr-default-originate 10.20.246.4,v1:10.20.30.40,true --ipv4-uc-nbr-default-originate-route-map 10.20.246.4,v1:10.20.30.40,rmap1
| §efa tenant service bgp peer-group show
                                            --detail Name : ten1bgppeer1 Tenant : tenant11 State : bgp-peer-created Description : Static Peer ----------- Device IP : 10.20.246.4 VRF : v1 AFI : ipv4 SAFI : unicast Remote IP : 10.20.30.40 Remote ASN : 50000 Next Hop Self : false Update Source IP : BFD Enabled : true BFD Interval : 0 BFD Rx : 0 BFD Multiplier : 0 MD5 Password : Remove Private AS : false Default Originate : true Default Originate Route Map : rmap1 Prefix List In : Prefix List Out : Route Map In : Route Map Out : Dev State : provisioned App State : cfg-in-sync | Device IP : 10.20.246.4 VRF : v1 AFI : ipv4 SAFI : unicast Remote IP : 10.20.30.50 Remote ASN : 50000 Next Hop Self : false Update Source IP : BFD Enabled : true BFD Interval : 0 BFD Rx : 0 BFD Multiplier : 0 MD5 Password : Remove Private AS : false Default Originate : false Default Originate Route Map : Prefix List In : Prefix List Out : Route Map In : Route Map Out : Dev State : provisioned App State : cfg-in-sync Device IP : 10.20.246.3 VRF : v1 AFI : ipv4 SAFI : unicast Remote IP : 10.20.30.40 Remote ASN : 50000 Next Hop Self : false Update Source IP : BFD Enabled : true BFD Interval : 0 BFD Rx : 0 | BFD Multiplier : 0 MD5 Password : Remove Private AS : false Default Originate : true Default Originate Route Map : Prefix List In : Prefix List Out : Route Map In : Route Map Out : Dev State : provisioned App State : cfg-in-sync Device IP : 10.20.246.3 VRF : v1 AFI : ipv4 SAFI : unicast Remote IP : 10.20.30.50 Remote ASN : 50000 Next Hop Self : false Update Source IP : BFD Enabled : true BFD Interval : 0 BFD Rx : 0 BFD Multiplier : 0 MD5 Password : Remove Private AS : false Default Originate : true Default Originate Route Map : tt Prefix List In : Prefix List Out : Route Map In : Route Map Out : Dev State : provisioned App State : cfg-in-sync | 
efa tenant service bgp peer show --detail
=======================================================================
Name             : bgp173-2501
Tenant           : tenant11
State            : bgp-peer-created
Description      :
Static Peer
-----------
       Device IP                   : 10.20.246.3
	VRF                         : v1
	AFI                         : ipv4
	SAFI                        : unicast
	Remote IP                   : 10.20.30.40
	Remote ASN                  : 50000
	Next Hop Self               : false
	Update Source IP            : 
	BFD Enabled                 : true
	BFD Interval                : 0
	BFD Rx                      : 0
	BFD Multiplier              : 0
	MD5 Password                : 
	Remove Private AS           : false
	Default Originate           : true
	Default Originate Route Map : 
	Prefix List In              : 
	Prefix List Out             : 
	Route Map In                : 
	Route Map Out               : 
	Dev State                   : provisioned
	App State                   : cfg-in-sync
	
      Device IP                   : 10.20.246.4
	VRF                         : v1
	AFI                         : ipv4
	SAFI                        : unicast
	Remote IP                   : 10.20.30.40
	Remote ASN                  : 50000
	Next Hop Self               : false
	Update Source IP            : 
	BFD Enabled                 : true
	BFD Interval                : 0
	BFD Rx                      : 0
	BFD Multiplier              : 0
	MD5 Password                : 
	Remove Private AS           : false
	Default Originate           : true
	Default Originate Route Map : rmap1
	Prefix List In              : 
	Prefix List Out             : 
	Route Map In                : 
	Route Map Out               : 
	Dev State                   : provisioned
	App State                   : cfg-in-sync   
=======================================================================
| 10.20.246.3 SLX# show running-config router bgp address-family ipv4 unicast vrf v1 redistribute connected neighbor 10.20.30.40 remote-as 50000 neighbor 10.20.30.40 default-originate neighbor 10.20.30.40 bfd neighbor 10.40.40.252 remote-as 4200000000 neighbor 10.40.40.252 next-hop-self maximum-paths 8 ! | 10.20.246.4 SLX# show running-config router bgp address-family ipv4 unicast vrf v1 redistribute connected neighbor 10.20.30.40 remote-as 50000 neighbor 10.20.30.40 default-originate route-map rmap1 neighbor 10.20.30.40 bfd neighbor 10.40.40.253 remote-as 4200000000 neighbor 10.40.40.253 next-hop-self maximum-paths 8 ! | 

Note
For information about commands and supported parameters to configure default-originate attribute, see Extreme Fabric Automation Command Reference, 3.0.0 .