Cisco has a few proprietary protocols, though many of them have been standardized, or adapted into emerging standards. The most popular Cisco proprietary protocol that hasn't been adopted as a standard is probably EIGRP. bit.ly/1OMvbZW
Enhanced Interior Gateway Routing Protocol (EIGRP) was once as Cisco Propitiatory routing protocol for Cisco routers. However many routers that are not Cisco now support the use of EIGRP.
The ISL protocol can be used in Cisco routers when configuring the subinterfaces.
EIGRP
CDP
this is a cisco propreitory protocol is not available for rfc
IGRP is Interior Gateway Routing Protocol, enhanced by Cisco proprietary Enhanced IGRP.
Yes
CDP is a Cisco proprietary protocol; it only works between Cisco devices. If CDP is enabled on a Cisco network device, it will regularly send frames with information about itself out its interfaces.CDP is a Cisco proprietary protocol; it only works between Cisco devices. If CDP is enabled on a Cisco network device, it will regularly send frames with information about itself out its interfaces.CDP is a Cisco proprietary protocol; it only works between Cisco devices. If CDP is enabled on a Cisco network device, it will regularly send frames with information about itself out its interfaces.CDP is a Cisco proprietary protocol; it only works between Cisco devices. If CDP is enabled on a Cisco network device, it will regularly send frames with information about itself out its interfaces.
SSL (Secure Socket Layer,) is a protocol. Most Cisco VPNs will use SSL as their security protocol, so there is no difference between Cisco VPN and SSL VPN.
HDLC
Layer 2 Tunneling Protocol (L2TP)
HDLC