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Re: Understanding Integration Bridge and MACs

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Thank you both but when I try to delete any such network using nova-manage network delete tenant net_ID, I get the following error:

2012-05-02 01:47:59 TRACE nova   File "/opt/stack/nova/bin/nova-manage", line 867, in delete
2012-05-02 01:47:59 TRACE nova     raise Exception("Deleting by fixed_range is not supported " \
2012-05-02 01:47:59 TRACE nova Exception: Deleting by fixed_range is not supported with the QuantumManager

How can I delete nets defined using fixed_range parameter?

Thanks,
Salman

From: dan@xxxxxxxxxx
Date: Mon, 14 May 2012 19:23:34 -0700
Subject: Re: [Openstack] Understanding Integration Bridge and MACs
To: salmanmk@xxxxxxxx
CC: openstack@xxxxxxxxxxxxxxxxxxx



On Mon, May 14, 2012 at 3:19 PM, Salman Malik <salmanmk@xxxxxxxx> wrote:









In addition to the mail that follows, I am having some problem with quantum networks as well. When I create a network using :

sudo nova-manage network create --label=$tenant0 --fixed_range_v4=$iprange0 --project_id=$tenant0



I can see the network using both "quantum list_nets $tenant0" and "nova-manage network list", but when I delete the network using "quantum delete_net $tenant0 $netID", the nova-manage network list still shows the network and when I try to use the same CIDR for another network,I get an error saying CIDR already in use. Shouldn't deleting "quantum list_nets" and "nova-manage network list" be consistent with each other ?



In Essex, when using Nova all Quantum network creation and deletion must occur using nova-manage.  This is because we store the IP address management data associated with a network is stored in the Nova database.  As Yong mentioned, in Folsom we are storing IP address management data in Quantum itself, in which case network creation can happen directly via the Quantum API and Nova VMs will still be able to get IPs.  


Dan
 





From: salmanmk@xxxxxxxx
To: openstack@xxxxxxxxxxxxxxxxxxx


Subject: Understanding Integration Bridge and MACs
Date: Sun, 13 May 2012 19:42:14 -0500





Hi Dan and Others,

I am trying to understand the actions taken by Ryu when the new instance sends DHCP discover message to dnsmasq. When I launch new instannce it keeps on sending discover messages and controller keeps on dropping these messages. But looking at the traffic I couldn't exactly map which MAC address belonged to which entity. Can someone help me with my understanding of the MAC addresses. Using ifconfig , "ovs-ofctl show br-int" and "ovs-ofctl snoop br-int" (output shown after MAC addresses), I know exactly about some MAC addresses and can't figure out some of them:



Interfaces              |        HWAddress          |        IP-addr
---------------------------------------------------------------------------------------------
eth0                        |        08:00:27:7a:ff:65    |    10.0.3.15


eth1                        |        08:00:27:16:d5:09  |    10.0.0.10             <========plugged into br-int
gw-82bd3a73-dc    |        fa:16:3e:49:57:1b  |    10.0.0.1               <========plugged into br-int (this is the --listen-address of my two dnsmasqs)


br-int                       |        08:00:27:16:d5:09 |                                <========why doesn't bridge have no IP ?
new-instance          |        02:d8:47:48:35:26  <====== MAC address of newly launched instance? (see output below)



Unkown                 |        fa:16:3e:5e:02:17   <======Seemingly unknown MAC address(which is related to the new instance?)


Unkown                  |        33:33:00:00:00:16   <====== MAC address related to multicast ?




Questions:

1. What is gw-82bd3a73-dc interface ?


2. I am kind of unsure why br-int is so useful? 
3. Why doesn't br-int don't have any IP address?
4. Why do we need to plugin a compute node's interface to br-int? (so that guest instances on remote host can communicate with each other?)


5. What is the relationship b/w 02:d8:47:48:35:26 and fa:16:3e:5e:02:17 MAC addresses in the following output?



=====================
Output of : ovs-ofctl snoop br-int 
=====================


OFPT_ECHO_REQUEST (xid=0x0): 0 bytes of payload
OFPT_ECHO_REPLY (xid=0x0): 0 bytes of payload
OFPT_PORT_STATUS (xid=0x0): ADD: 7(tap76127847-b1): addr:02:d8:47:48:35:26


     config:     0
     state:      LINK_DOWN
     current:    10MB-FD COPPER
OFPT_FLOW_MOD (xid=0x491662da): DEL priority=0 buf:0x0 actions=drop
OFPT_BARRIER_REQUEST (xid=0x491662db):
OFPT_BARRIER_REPLY (xid=0x491662db):


OFPT_PORT_STATUS (xid=0x0): MOD: 7(tap76127847-b1): addr:02:d8:47:48:35:26
     config:     0
     state:      0
     current:    10MB-FD COPPER
OFPT_ECHO_REQUEST (xid=0x0): 0 bytes of payload
OFPT_ECHO_REPLY (xid=0x0): 0 bytes of payload


OFPT_PACKET_IN (xid=0x0): total_len=90 in_port=7 data_len=90 buffer=0x00000167
tunnel0:in_port0007:tci(0) macfa:16:3e:5e:02:17->33:33:00:00:00:16 type86dd proto58 tos0 ipv6::->ff02::16 port143->0
fa:16:3e:5e:02:17 > 33:33:00:00:00:16, ethertype IPv6 (0x86dd), length 90: :: > ff02::16: HBH ICMP6, multicast listener report v2, 1 group record(s), length 28


OFPT_PACKET_OUT (xid=0x491662dc): in_port=7 actions_len=0 actions=drop buffer=0x00000167
OFPT_PACKET_IN (xid=0x0): total_len=322 in_port=7 data_len=128 buffer=0x00000168
tunnel0:in_port0007:tci(0) macfa:16:3e:5e:02:17->ff:ff:ff:ff:ff:ff type0800 proto17 tos0 ip0.0.0.0->255.255.255.255 port68->67


fa:16:3e:5e:02:17 > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 128: truncated-ip - 194 bytes missing! 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from fa:16:3e:5e:02:17, length 280
OFPT_PACKET_OUT (xid=0x491662dd): in_port=7 actions_len=0 actions=drop buffer=0x00000168


OFPT_PACKET_IN (xid=0x0): total_len=78 in_port=7 data_len=78 buffer=0x00000169
fa:16:3e:5e:02:17 > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 128: truncated-ip - 194 bytes missing! 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from fa:16:3e:5e:02:17, length 280


OFPT_PACKET_OUT (xid=0x491662e3): in_port=7 actions_len=0 actions=drop buffer=0x0000016e
OFPT_PACKET_IN (xid=0x0): total_len=70 in_port=7 data_len=70 buffer=0x0000016f
tunnel0:in_port0007:tci(0) macfa:16:3e:5e:02:17->33:33:00:00:00:02 type86dd proto58 tos0 ipv6fe80::f816:3eff:fe5e:217->ff02::2 port133->0


fa:16:3e:5e:02:17 > 33:33:00:00:00:02, ethertype IPv6 (0x86dd), length 70: fe80::f816:3eff:fe5e:217 > ff02::2: ICMP6, router solicitation, length 16
OFPT_PORT_STATUS (xid=0x0): MOD: 7(tap76127847-b1): addr:02:d8:47:48:35:26


     config:     0
     state:      LINK_DOWN
     current:    10MB-FD COPPER
OFPT_PORT_STATUS (xid=0x0): DEL: 7(tap76127847-b1): addr:02:d8:47:48:35:26
     config:     0
     state:      LINK_DOWN


     current:    10MB-FD COPPER
OFPT_FLOW_MOD (xid=0x491662e5): DEL priority=0,in_port=7 actions=drop
OFPT_FLOW_MOD (xid=0x491662e6): DEL priority=0 actions=drop
OFPT_BARRIER_REQUEST (xid=0x491662e7):
OFPT_BARRIER_REPLY (xid=0x491662e7):



Thanks!
Salman
 		 	   		  
 		 	   		  

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