Yersinia implements several attacks for the following protocols: Spanning Tree (STP), Cisco Discovery (CDP), Dynamic Host Configuration (DHCP), Hot Standby Router (HSRP), Dynamic Trunking (DTP), 802.1q and VLAN Trunking (VTP), helping a pen-tester with different tasks.
You can download it from the following link: https://packetstormsecurity.com/files/download/130641/yersinia-0.7.3.tar.gz
Source: https://packetstormsecurity.com/files/130641/Yersinia-0.7.3.html