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[Linux-cluster] OT: how to monitor VLAN membership



Hi,

this is a bit OT, but definitely cluster-related.


I am looking for a way to test the switch VLAN configuration from my RHEL5.4 cluster nodes.

The cluster is running Virtual Machines as services, there is a network bridge for each VLAN configured on the each of the nodes. The cluster nodes itself have no need to access the VM's VLANs, so the bridges do not have any IP assigned to it. As the VMs may be migrated between the nodes, it is crucial that every node may use any required VLAN.

While we do monitor the switch configuration, we came accross a broken switch, which seemed to work but did not forward some VLANs although the configuration was correct. I would like the nodes to test whether they have access to a given VLAN themselves to recognize that situation.

As there are no IPs assigned to the bridges, simple ping-style tests are not an option. I tried to find something based on arp, but have not been successful yet.

Any hint is highly appreciated.


best regards, Gunther

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Gunther Schlegel
Manager IT Infrastructure


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