Protocols Defined by Cisco Systems

Cisco Systems plays an active role in the IETF committees to bring Cisco technology initiatives into the standards track. At the same time, Cisco created many proprietary protocols, mostly in the data link layer (layer 2) and network layer (layer 3). Some of the Cisco protocols are listed as follows:

Network/Routing

• CGMP: Cisco Group Management Protocol
• EIGRP: Enhanced Interior Gateway Routing Protocol
• IGRP: Interior Gateway Routing Protocol
• HSRP: Hot Standby Routing Protocol
• RGMP: Cisco Router Port Group Management Protocol

• CDP: Cisco Discovery Protocol
• DISL: Dynamic Inter-Switch Link Protocol
• DTP: Dynamic Trunk Protocol
• ISL: Inter-Switch Link Protocol
• VTP: VLAN Trunking Protocol

Security/VPN

• L2F: Layer 2 Forwarding Protocol
• TACACS: Terminal Access Controller Access Control System and (TACACS+)

Other

• SCCP: Skinny Client Control Protocol
• XOT: X.25 Over TCP
• NetFlow: Network traffic monitoring and management

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