Examining the routers

Virtual routers are implemented as network namespaces on one or more nodes. In our single-node environment, the two routers that have been created so far can both be found on the same node. Using the ip netns command as root or a user with sudo privileges, you can list all network namespaces on a host, like so:

The two qrouter namespaces in the list correspond to the two routers we've created so far:

Using the ip netns exec <namespace> command, you can specify a command to execute within the specified namespace. Useful commands such as ip, netstat, ps, and iptables provide details within the scope of the namespace they're executed in. A quick look at the MySimpleRouter network namespace shows the virtual interface created by Neutron when we attached the router to the MySimpleSubnet subnet earlier in this chapter:

Using the ovs-vsctl show command, we can see the qr-2e525501-5f interface attached to the integration bridge in a local VLAN mapped to MySimpleNetwork:

Additional...