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These are routing and communication protocols developed and maintained by Cisco Systems. Standardized protocols that are deployed in Cisco products are not listed here now. Some standard protocols may be listed here because the page shows that they were developed based on a Cisco proprietary protocol that does not have its own page.
Cisco IPS Manager Express (for multiple IPS devices) Cisco Identity Services Engine (ISE) Panoptica; PostOffice protocol (not to be confused with POP3, SMTP, or other mail delivery protocols). It is a Cisco proprietary protocol that runs over UDP on port 45000. [23] It provides a communications vehicle between the sensors and the Director platform.
Cisco Discovery Protocol (CDP) is a proprietary data link layer protocol developed by Cisco Systems in 1994 [1] by Keith McCloghrie and Dino Farinacci. It is used to share information about other directly connected Cisco equipment, such as the operating system version and IP address .
VLAN Trunking Protocol (VTP) is a Cisco proprietary protocol that propagates the definition of Virtual Local Area Networks on the whole local area network. [1] To do this, VTP carries VLAN information to all the switches in a VTP domain. VTP advertisements can be sent over 802.1Q, and ISL trunks.
Download QR code; Print/export Download as PDF; Printable version; In other projects Wikidata item; Appearance. move to sidebar hide. ... Cisco Discovery Protocol; F.
UDLD is a Cisco-proprietary protocol but HP, Extreme Networks, and AVAYA all have a similar feature calling it by a different name. HP calls theirs Device Link Detection Protocol (DLDP). Extreme Networks call it Extreme Link Status Monitoring (ELSM) and AVAYA calls theirs, Link-state Tracking.
PAgP is proprietary to Cisco Systems. A similar protocol known as Link Aggregation Control Protocol (LACP) — released by the IEEE — is an industry standard and is not tied to a specific vendor. PAgP messages are always sent to the well-known Cisco multicast address 01-00-0C-CC-CC-CC with protocol type code 0x0104.
In 1990, Cisco's extensions on top of TACACS became a proprietary protocol called Extended TACACS (XTACACS). Although TACACS and XTACACS are not open standards, Craig Finseth of the University of Minnesota, with Cisco's assistance, published a description of the protocols in 1993 as IETF RFC 1492 for informational purposes.