[ovs-discuss] vm cannot get IP because of lost of dhcp offer.

[顾兆伦]

hi all,
   sorry to bother, but I have a wired problem.
   I have neutron and ovs in my environment, the server is alone, dhcp agent and ovs-agent is on the same host. I create a vm, but cannot get ip. I use tcpdump to catch the packages.
in tap device of dhcp port, it can receive the dhcp reply:
17:58:37.238634 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from fa:16:3e:6b:e4:29 (oui Unknown), length 300
17:58:37.238884 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from fa:16:3e:6b:e4:29 (oui Unknown), length 300
17:58:37.238924 IP 172.27.2.126.bootps > 172.27.2.7.bootpc: BOOTP/DHCP, Reply, length 332
17:58:37.239041 IP 172.27.2.126.bootps > 172.27.2.7.bootpc: BOOTP/DHCP, Reply, length 332


but in qvo of vm port, there is just dhcp discover, reply is disappear:

17:58:40.238597 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from fa:16:3e:6b:e4:29 (oui Unknown), length 300
17:58:40.238864 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from fa:16:3e:6b:e4:29 (oui Unknown), length 300


below is the mac learning rule of br-int, the port is 1,
|
port  VLAN  MAC                Age
   1    17  fa:16:3e:6b:e4:29           50
but the ofport is 17, 
 mac                 : []
mac_in_use          : "26:88:26:d4:c0:89"
mtu                 : 1500
name                : "qvof88133e6-86"
ofport              : 27
ofport_request      : []
options             : {}


1 is the patch-tun
|
   mac_in_use          : "92:b7:0e:9a:6c:ec"
   mtu                 : []
   name                : patch-tun
   ofport              : 1
   ofport_request      : []
   options             : {peer=patch-int}
   other_config        : {}


seems the br-int has learned the wrong mac-port-vlan mapping, why? and how to fix it?


thank you very much.


--
Zhaolun Gu，
Zhejiang university
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