The CPU on a 3560 or 3750 has a stash of 128 MAC addresses allocated when the device is built, for physical ports and SVI (vlan) interfaces.
Explanation of MAC Address allocation
You can get the "base" MAC address by issueing a show version. The first 64 addresses (inclusive) from that address are used for physical ports. The next 64 after that are used for SVI (vlan) interfaces.
The CPU allocates MAC addresses to vlan interfaces in the order which the interfaces are created, so they can change after a reboot of the switch.
If you use more than 64 vlan interfaces, the additional interfaces will all get the same MAC address as the 64th interface.
base address: xx:xx:xx:xx:3e:00
first vlan address: xx:xx:xx:xx:3e:40 (this is base + 64) last vlan address: xx:xx:xx:xx:3e:7f (this is base + 127)
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