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Julie_Paul
Employee
Employee

How to set an Inverted MAC

Can we manually configure what the inverted MAC Address will be in R80.10.  Has anyone done this or seen it work for R80.10?  Do you have the procedure?

it is the “inverted back source MAC Address” that appears in the switch ARP table

If one was to run a ‘fw ctl zdebug –m cluster + select’ you would see in the logs something like this:

 

;[cpu_7];[fw4_0];fwha_select_ip_packet: The inverted back source MAC address will be 00:16:63:BF:23:FF;

 

When one does a lookup of the vendor for MAC Address 00:16:63 is states the vendor of KBT Mobile.  Would like to know if there is a way to configure it to use some a different MAC, like 00:1C:7F or 00:90:FB or possibly an older Noxia MAC

This is what the ARP table looked like:

        * - primary entry, G - Gateway MAC, (R) - Routed MAC, O - Overlay MAC

        age - seconds since last seen,+ - primary entry using vPC Peer-Link

   VLAN     MAC Address      Type      age     Secure NTFY   Ports/SWID.SSID.LID

---------+-----------------+--------+---------+------+----+------------------

* 13       0000.0000.0200    dynamic   0          F    F  Eth102/1/31

* 13       0016.63bf.23ff    dynamic   0          F    F  Eth102/1/31

* 13       001c.7f62.ed66    dynamic   0          F    F  Eth102/1/31

5 Replies
PhoneBoy
Admin
Admin

Probably a better question for Appliances and Gaia‌.

Hopefully one of Alexander Kim‌'s team can provide some commentary.

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_Val_
Admin
Admin

In your list, the first MAC belongs to ClusterXL: 0000.0000.0200. This is the source MAC address for CCP frames.

I am not sure about the second one. Did you enable vMAC by any chance?  

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_Val_
Admin
Admin

Answering my own question. No, neither one looks like vMAC. You can find some details here: How to enable ClusterXL Virtual MAC (VMAC) mode 

The only logical conclusion is that you do have some third party sending frames to the same switch port. 

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PhoneBoy
Admin
Admin

There's no specific way to control what the inverted MAC will be, but it is based on your original MAC as well as the kernel parameters fwha_mac_magic and the fwha_mac_forward_magic.

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Julie_Paul
Employee
Employee

Thanks for the response!

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