bgp cannot be established after config deployed

[synliao]

DC1_SPINE1#sh run | s router bgp
router bgp 65001
router-id 192.168.255.1
no bgp default ipv4-unicast
distance bgp 20 200 200
maximum-paths 4 ecmp 4
neighbor EVPN-OVERLAY-PEERS peer group
neighbor EVPN-OVERLAY-PEERS next-hop-unchanged
neighbor EVPN-OVERLAY-PEERS update-source Loopback0
neighbor EVPN-OVERLAY-PEERS bfd
neighbor EVPN-OVERLAY-PEERS ebgp-multihop 3
neighbor EVPN-OVERLAY-PEERS password 7 q+VNViP5i4rVjW1cxFv2wA==
neighbor EVPN-OVERLAY-PEERS send-community
neighbor EVPN-OVERLAY-PEERS maximum-routes 0
neighbor IPv4-UNDERLAY-PEERS peer group
neighbor IPv4-UNDERLAY-PEERS password 7 AQQvKeimxJu+uGQ/yYvv9w==
neighbor IPv4-UNDERLAY-PEERS send-community
neighbor IPv4-UNDERLAY-PEERS maximum-routes 12000
neighbor 172.31.255.1 peer group IPv4-UNDERLAY-PEERS
neighbor 172.31.255.1 remote-as 65101
neighbor 172.31.255.1 description DC1_LEAF1A_Ethernet1
neighbor 172.31.255.5 peer group IPv4-UNDERLAY-PEERS
neighbor 172.31.255.5 remote-as 65101
neighbor 172.31.255.5 description DC1_LEAF1B_Ethernet1
neighbor 172.31.255.9 peer group IPv4-UNDERLAY-PEERS
neighbor 172.31.255.9 remote-as 65102
neighbor 172.31.255.9 description DC1_SVC2A_Ethernet1
neighbor 172.31.255.13 peer group IPv4-UNDERLAY-PEERS
neighbor 172.31.255.13 remote-as 65102
neighbor 172.31.255.13 description DC1_SVC2B_Ethernet1
neighbor 192.168.255.3 peer group EVPN-OVERLAY-PEERS
neighbor 192.168.255.3 remote-as 65101
neighbor 192.168.255.3 description DC1_LEAF1A
neighbor 192.168.255.4 peer group EVPN-OVERLAY-PEERS
neighbor 192.168.255.4 remote-as 65101
neighbor 192.168.255.4 description DC1_LEAF1B
neighbor 192.168.255.5 peer group EVPN-OVERLAY-PEERS
neighbor 192.168.255.5 remote-as 65102
neighbor 192.168.255.5 description DC1_SVC2A
neighbor 192.168.255.6 peer group EVPN-OVERLAY-PEERS
neighbor 192.168.255.6 remote-as 65102
neighbor 192.168.255.6 description DC1_SVC2B
redistribute connected route-map RM-CONN-2-BGP
!
address-family evpn
neighbor EVPN-OVERLAY-PEERS activate
!
address-family ipv4
no neighbor EVPN-OVERLAY-PEERS activate
neighbor IPv4-UNDERLAY-PEERS activate
DC1_SPINE1#
DC1_SPINE1#sh ip bgp sum
BGP summary information for VRF default
Router identifier 192.168.255.1, local AS number 65001
Neighbor Status Codes: m - Under maintenance
Description Neighbor V AS MsgRcvd MsgSent InQ OutQ Up/Down State PfxRcd PfxAcc
DC1_LEAF1A_Ethernet1 172.31.255.1 4 65101 0 0 0 0 00:18:25 Active
DC1_LEAF1B_Ethernet1 172.31.255.5 4 65101 0 0 0 0 00:18:25 Active
DC1_SVC2A_Ethernet1 172.31.255.9 4 65102 0 0 0 0 00:18:25 Active
DC1_SVC2B_Ethernet1 172.31.255.13 4 65102 0 0 0 0 00:18:25 Active

[root@DC1-SPINE1 /]# netstat -tuplan | grep 179
tcp6 0 0 :::179 :::* LISTEN 3056/Bgp
[root@DC1-SPINE1 /]# telnet 172.31.255.1 179
Trying 172.31.255.1...
telnet: connect to address 172.31.255.1: Connection refused
[root@DC1-SPINE1 /]#

---

DC1_LEAF1A#sh run | s router bgp
router bgp 65101
router-id 192.168.255.3
no bgp default ipv4-unicast
distance bgp 20 200 200
maximum-paths 4 ecmp 4
neighbor EVPN-OVERLAY-PEERS peer group
neighbor EVPN-OVERLAY-PEERS update-source Loopback0
neighbor EVPN-OVERLAY-PEERS bfd
neighbor EVPN-OVERLAY-PEERS ebgp-multihop 3
neighbor EVPN-OVERLAY-PEERS password 7 q+VNViP5i4rVjW1cxFv2wA==
neighbor EVPN-OVERLAY-PEERS send-community
neighbor EVPN-OVERLAY-PEERS maximum-routes 0
neighbor IPv4-UNDERLAY-PEERS peer group
neighbor IPv4-UNDERLAY-PEERS password 7 AQQvKeimxJu+uGQ/yYvv9w==
neighbor IPv4-UNDERLAY-PEERS send-community
neighbor IPv4-UNDERLAY-PEERS maximum-routes 12000
neighbor MLAG-IPv4-UNDERLAY-PEER peer group
neighbor MLAG-IPv4-UNDERLAY-PEER remote-as 65101
neighbor MLAG-IPv4-UNDERLAY-PEER next-hop-self
neighbor MLAG-IPv4-UNDERLAY-PEER description DC1_LEAF1B
neighbor MLAG-IPv4-UNDERLAY-PEER route-map RM-MLAG-PEER-IN in
neighbor MLAG-IPv4-UNDERLAY-PEER password 7 vnEaG8gMeQf3d3cN6PktXQ==
neighbor MLAG-IPv4-UNDERLAY-PEER send-community
neighbor MLAG-IPv4-UNDERLAY-PEER maximum-routes 12000
neighbor 10.255.251.1 peer group MLAG-IPv4-UNDERLAY-PEER
neighbor 10.255.251.1 description DC1_LEAF1B
neighbor 172.31.255.0 peer group IPv4-UNDERLAY-PEERS
neighbor 172.31.255.0 remote-as 65001
neighbor 172.31.255.0 description DC1_SPINE1_Ethernet1
neighbor 172.31.255.2 peer group IPv4-UNDERLAY-PEERS
neighbor 172.31.255.2 remote-as 65001
neighbor 172.31.255.2 description DC1_SPINE2_Ethernet1
neighbor 192.168.255.1 peer group EVPN-OVERLAY-PEERS
neighbor 192.168.255.1 remote-as 65001
neighbor 192.168.255.1 description DC1_SPINE1
neighbor 192.168.255.2 peer group EVPN-OVERLAY-PEERS
neighbor 192.168.255.2 remote-as 65001
neighbor 192.168.255.2 description DC1_SPINE2
redistribute connected route-map RM-CONN-2-BGP
!
vlan-aware-bundle Tenant_A_OP_Zone
rd 192.168.255.3:10
route-target both 10:10
redistribute learned
vlan 110-111
!
address-family evpn
neighbor EVPN-OVERLAY-PEERS activate
!
address-family ipv4
no neighbor EVPN-OVERLAY-PEERS activate
neighbor IPv4-UNDERLAY-PEERS activate
neighbor MLAG-IPv4-UNDERLAY-PEER activate
!
vrf Tenant_A_OP_Zone
rd 192.168.255.3:10
route-target import evpn 10:10
route-target export evpn 10:10
router-id 192.168.255.3
neighbor 10.255.251.1 peer group MLAG-IPv4-UNDERLAY-PEER
redistribute connected

bash-5.1# netstat -tuplan | grep 179
tcp6 0 0 :::179 :::* LISTEN 2851/Bgp
bash-5.1#

DC1_LEAF1A#ping 172.31.255.2
PING 172.31.255.2 (172.31.255.2) 72(100) bytes of data.
80 bytes from 172.31.255.2: icmp_seq=1 ttl=64 time=0.104 ms
80 bytes from 172.31.255.2: icmp_seq=2 ttl=64 time=0.024 ms
80 bytes from 172.31.255.2: icmp_seq=3 ttl=64 time=0.022 ms
80 bytes from 172.31.255.2: icmp_seq=4 ttl=64 time=0.015 ms
80 bytes from 172.31.255.2: icmp_seq=5 ttl=64 time=0.016 ms

--- 172.31.255.2 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.015/0.036/0.104/0.034 ms, ipg/ewma 0.093/0.068 ms
DC1_LEAF1A#telnet 172.31.255.0 179
Trying 172.31.255.0...
telnet: connect to address 172.31.255.0: Connection refused