Realtek RTL8326 is 24*100Mbit + 2*1Gbit switch controller. It implements RRCP protocol, per-port tx/rx counters, vlans and many more feathures. Unfortunately, 802.1Q taging VLAN implementation in this chip containg serious design flaw. See RTL8326_dot1q_bug for details.

Here is manufacturer’s product description:

Here is datasheet for this chip, including detailed RRCP protocol description and internal register mapping: