neutron dhcp无法获取ip

[root@bogon ~]# ip netns exec qdhcp-e00c4e3a-3634-4c59-8ce9-c09221cf684b ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ns-10dcfcba-44@if8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether fa:16:3e:4a:3c:59 brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet 172.16.100.100/24 brd 172.16.100.255 scope global ns-10dcfcba-44
       valid_lft forever preferred_lft forever
    inet 169.254.169.254/16 brd 169.254.255.255 scope global ns-10dcfcba-44
       valid_lft forever preferred_lft forever

[root@bogon ~]# brctl delif brqe00c4e3a-36 tap10dcfcba-44
[root@bogon ~]# brctl addif brqe00c4e3a-36  tap1ea4dc8e-63
[root@bogon ~]# 

[root@bogon ~]# ip netns exec qdhcp-1fcf749d-8e67-40ad-8718-e5daa85453fc tcpdump -i ns-1ea4dc8e-63 udp and port 67 or port 68 or port  69 and ether src ac:8d:34:89:ae:ec -env 
tcpdump: listening on ns-1ea4dc8e-63, link-type EN10MB (Ethernet), capture size 262144 bytes
12:16:32.425031 ac:8d:34:89:ae:ec > Broadcast, ethertype IPv4 (0x0800), length 389: (tos 0x0, ttl 64, id 6746, offset 0, flags [none], proto UDP (17), length 375)
    0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from ac:8d:34:89:ae:ec, length 347, xid 0x8ebd671, Flags [Broadcast]
          Client-Ethernet-Address ac:8d:34:89:ae:ec
          Vendor-rfc1048 Extensions
            Magic Cookie 0x63825363
            DHCP-Message Option 53, length 1: Discover
            MSZ Option 57, length 2: 1472
            Parameter-Request Option 55, length 35: 
              Subnet-Mask, Time-Zone, Default-Gateway, Time-Server
              IEN-Name-Server, Domain-Name-Server, Hostname, BS
              Domain-Name, RP, EP, RSZ
              TTL, BR, YD, YS
              NTP, Vendor-Option, Requested-IP, Lease-Time
              Server-ID, RN, RB, Vendor-Class
              TFTP, BF, GUID, Option 128
              Option 129, Option 130, Option 131, Option 132
              Option 133, Option 134, Option 135
            GUID Option 97, length 17: 0.225.23.144.142.233.48.169.144.234.17.119.96.0.134.81.125
            NDI Option 94, length 3: 1.3.0
            ARCH Option 93, length 2: 11
            Vendor-Class Option 60, length 32: "HW-Client:Arch:00011:UNDI:003000"
12:16:36.006052 ac:8d:34:89:ae:ec > Broadcast, ethertype IPv4 (0x0800), length 401: (tos 0x0, ttl 64, id 6747, offset 0, flags [none], proto UDP (17), length 387)
    0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from ac:8d:34:89:ae:ec, length 359, xid 0x8ebd671, Flags [Broadcast]
          Client-Ethernet-Address ac:8d:34:89:ae:ec
          Vendor-rfc1048 Extensions
            Magic Cookie 0x63825363
            DHCP-Message Option 53, length 1: Request
            Server-ID Option 54, length 4: 172.16.100.100
            Requested-IP Option 50, length 4: 172.16.100.101
            MSZ Option 57, length 2: 65280
            Parameter-Request Option 55, length 35: 
              Subnet-Mask, Time-Zone, Default-Gateway, Time-Server
              IEN-Name-Server, Domain-Name-Server, Hostname, BS
              Domain-Name, RP, EP, RSZ
              TTL, BR, YD, YS
              NTP, Vendor-Option, Requested-IP, Lease-Time
              Server-ID, RN, RB, Vendor-Class
              TFTP, BF, GUID, Option 128
              Option 129, Option 130, Option 131, Option 132
              Option 133, Option 134, Option 135
            GUID Option 97, length 17: 0.225.23.144.142.233.48.169.144.234.17.119.96.0.134.81.125
            NDI Option 94, length 3: 1.3.0
            ARCH Option 93, length 2: 11
            Vendor-Class Option 60, length 32: "HW-Client:Arch:00011:UNDI:003000"