In all-active multihoming, the non-DF keeps the SAP up, although it removes it from the default flooding list. In the single-active multihoming implementation the non-DF brings the SAP or SDP binding operationally down. See ES discovery and DF election procedures.
The following show commands display the status of the single-active ESI-7413 in the non-DF. The associated spoke SDP is operationally down and it signals PW Status standby to the multihomed CE:
*A:PE1# show service system bgp-evpn ethernet-segment name "ESI-7413"
===============================================================================
Service Ethernet Segment
===============================================================================
Name : ESI-7413
Admin State : Up Oper State : Up
ESI : 01:74:13:00:74:13:00:00:74:13
Multi-homing : singleActive Oper Multi-homing : singleActive
Source BMAC LSB : <none>
Sdp Id : 4
ES Activation Timer : 0 secs
Exp/Imp Route-Target : target:74:13:00:74:13:00
Svc Carving : auto
ES SHG Label : 262141
===============================================================================
*A:PE1# show service system bgp-evpn ethernet-segment name "ESI-7413" evi 1
===============================================================================
EVI DF and Candidate List
===============================================================================
EVI SvcId Actv Timer Rem DF DF Last Change
-------------------------------------------------------------------------------
1 1 0 no 06/11/2015 20:05:32
===============================================================================
===============================================================================
DF Candidates Time Added
-------------------------------------------------------------------------------
192.0.2.70 06/11/2015 20:05:20
192.0.2.73 06/11/2015 20:05:32
-------------------------------------------------------------------------------
Number of entries: 2
===============================================================================
*A:PE1# show service id 1 base
===============================================================================
Service Basic Information
===============================================================================
Service Id : 1 Vpn Id : 0
Service Type : VPLS
Name : (Not Specified)
Description : (Not Specified)
<snip>
-------------------------------------------------------------------------------
Service Access & Destination Points
-------------------------------------------------------------------------------
Identifier Type AdmMTU OprMTU Adm Opr
-------------------------------------------------------------------------------
sap:1/1/1:1 q-tag 9000 9000 Up Up
sdp:4:13 S(192.0.2.74) Spok 0 8978 Up Down
===============================================================================
* indicates that the corresponding row element may have been truncated.
*A:PE1# show service id 1 all | match Pw
Local Pw Bits : pwFwdingStandby
Peer Pw Bits : None
*A:PE1# show service id 1 all | match Flag
Flags : StandbyForMHProtocol
Flags : None