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Why is the router interface down and how do I bring it up?

asked 2013-06-05 12:19:23 -0600

mark0978 gravatar image

updated 2013-06-06 09:26:49 -0600

All this is using Grizzly with quantum

I have TenantA-Net ( with a VM (

I have Ext-Net ( and connected to that I have a Router R1 with interfaces (, and

I'm on my laptop ( trying to access the VM and I can't get there. I back up a few steps and I can't even traceroute to the router

tracert -d
Tracing route to over a maximum of 30 hops
  1  reports: Destination host unreachable.
Trace complete.

I'm suspecting it is because that interface is "DOWN" as indicated by this:

(quantum) router-port-list --column id --column status --column fixed_ips OutOfBox
| id          | status | fixed_ips                                             |
| c8cb677e... | DOWN   | {"subnet_id": "...", "ip_address": ""}  |
| c98ca86e... | ACTIVE | {"subnet_id": "...", "ip_address": ""}    |

But I know of no way to turn it from DOWN to ACTIVE.

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having exactly the same question. The instance cannot ping any address outside of the openstack setup and vice versa.

Vic gravatar imageVic ( 2013-06-12 03:27:17 -0600 )edit

I have a similar issue. However I'm able to ping the router's interface. I'm also able to novnc into the cirros instance and ping out. | 37fac633-6c25-435a-a5df-6460d0d00d13 | DOWN | {"subnet_id": "d10b239a-5fd4-4a5a-b095-900aa2aa800a", "ip_address": ""} | | 829e3a06-6ab6-4463

james.shimer gravatar imagejames.shimer ( 2013-06-14 14:16:29 -0600 )edit

You need to provide more information. Provide the quantum-l3-agent logs and quantum related configuration files. How many external networks do you have (you can only have 1 per instance). So you have other routers?

fmanco gravatar imagefmanco ( 2013-06-15 09:12:15 -0600 )edit

took the whole network down, will try to reproduce the situation in the weekend. However, I had only one external network as the gateway. I can ping the internal network gateway interface (, but cannot ping the external network interface (

Vic gravatar imageVic ( 2013-06-21 03:00:29 -0600 )edit

I am also facing the same issue (not able to ping VM from within or outside)...can anyone help. I have already created rules to allow icmp/ssh traffic.

sngirame gravatar imagesngirame ( 2013-10-03 06:35:44 -0600 )edit

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answered 2013-06-13 10:46:51 -0600

Vic gravatar image

updated 2013-06-13 10:59:35 -0600

The status can be influenced by flip the admin status

quantum port-update <port id> --admin_state_up true

However, the connection to outside is still not working.

ping command from instance to dhcp address is working, not the gateway address. I disabled the dhcp function, the address is still working...

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Trying this with neutron and Havana (who has the same issue) this solution does not work.

sferich888 gravatar imagesferich888 ( 2014-01-17 09:05:04 -0600 )edit

Same here with liberty. There is a serious lack of troubleshooting documentation

AJ NOURI gravatar imageAJ NOURI ( 2016-05-08 12:37:07 -0600 )edit

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Asked: 2013-06-05 12:19:23 -0600

Seen: 8,715 times

Last updated: Jun 13 '13