How to determine cluster network mac address
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- How to determine cluster network mac address how to#
- How to determine cluster network mac address download#
The MAC addresses can still be automatically generated as it is by default, and you will not end up with duplicate MACs.Ĭonfiguration is done inside the “switch virtual domain” configuration. The most easy (and my personal recommend this for most cases) is simply by using a different VSS domain ID for every VSS cluster. There are a few options to get rid of these duplicate MAC addresses. I’m sure I don’t have to tell you that this is something you don’t want: it brakes a lot of things in your network. If you’re planning to use multiple VSS clusters in the same network and in the same VLAN(s), you’ll end up with duplicate MAC addresses. This is related to the switch MAC address.īy default, all MAC addresses used by the Catalyst 4500-X VSS cluster is automatically generated and is based on the VSS domain ID.
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However, there is one additional note which is not mentioned on that (and other) blogs if you are planning to use multiple Catalyst 4500-X VSS clusters. I think THIS guide is one of the best to do this.
How to determine cluster network mac address how to#
Once you have identified the particular vSwitch and port, then you can get further details by specifying "-v" for vSwitch name and "-p" for the port number as displayed from the previous execution.As you might know, creating a VSS on Cisco Catalyst 4500-X switches is pretty easy and there are many many guides with information how to do this. The script can be called with the "-l" option to provide a high level dump of all MAC Addresses.
How to determine cluster network mac address download#
You can download the script vswitchInfo.sh which runs directly on ESXi's TSM (Tech Support Mode). Not only does it provide this mapping but also what is specifically using a given port whether it is mapped to internal interface or a particular virtual machine. I decided to write a tiny script that would allow a user to dump out all the MAC Addresses from the vSwitch(s) found on an ESX(i) host. ~ # vsish -e ls /net/portsets/vSwitch0/ports/16777220/Īs you can see it is pretty tedious to go through each of the ports and it does not easily allow you to figure out what is exactly connected to the port until you view the " status" property. When looking at a particular port, it provides quite a bit of information on what is connected and various metrics/statistics: ~ # vsish -e ls /net/portsets/vSwitch0/ports The "ports" section is what we are interested in: Here are some of things you can view for a given vSwitch using vsish: So that this value will be taken as the permanent MAC address of the network interface. The solution described above is the proper and most flexible way of solving this problem, but what if you really wanted to query the internal vSwitch and extract out the MAC Addresses that way? Well the answer is, you can so using vsish on ESXi (vsish is not available on ESX unless you have the VMware debugging RPM package installed). Add MACADDR directive and specify the required MAC address to the /etc/sysconfig/network-scripts/ifcfg-ethX network configuration. I am sure there is most likely a PowerCLI solution to solving this problem as well. You can easily do this through a script such as using the vSphere SDK for Perl script: which supports both stand vSwitch and distributed vSwitch or if you prefer a GUI, you can use the popular RVTools.
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You can search for all virtual machines and dump out their associated MAC Addresses and correlate that back to a particular vSwitch. However, you can still perform a lookup of all the MAC Addresses found on a particular ESX(i)/vCenter host by using the vSphere APIs. The vSwitch is not exposed like a traditional physical switch in which you can run commands against such as " show mac-address-table" to display the MAC addresses found on the switch. The internal VMware vSwitch is pretty much closed off as a blackbox. The user was trying to locate a particular virtual machine's MAC Address due to an IP conflict that was identified. There was an interesting question this week on the VMTN community forums about querying a vSwitch on an ESX(i) host.