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* Cisco Inter-Switch Link, a proprietary Cisco VLAN trunking protocol
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Cisco and Inter-Switch
Inter-Switch Link ( ISL ) is a Cisco proprietary protocol used to interconnect multiple switches and maintain VLAN information as traffic travels between switches on trunk links.
Cisco also has a proprietary trunking protocol called Inter-Switch Link which encapsulates the Ethernet frame with its own container, which labels the frame as belonging to a specific VLAN.
The Cisco Inter-Switch Link ( ISL ) protocol for supporting VLANs on Ethernet and similar LAN technologies was based on IEEE 802. 10 ; in this application 802. 10 has largely been replaced by IEEE 802. 1Q.
* Cisco Inter-Switch Link ( ISL ) is a Cisco proprietary protocol that maintains VLAN information as traffic flows between switches and routers.
Cisco Inter-Switch Link ( ISL ) is a Cisco Systems proprietary protocol that maintains VLAN information in Ethernet frames as traffic flows between switches and routers, or switches and switches.
Another related Cisco protocol, Dynamic Inter-Switch Link Protocol ( DISL ) simplifies the creation of an ISL trunk from two interconnected Fast Ethernet devices.
fr: Cisco Inter-Switch Link
Cisco and Link
( Note that the term ' trunk ' is also used for what Cisco calls " channels ": Link Aggregation or Port Trunking ).
* Cisco page on Synchronous Data Link Control and Derivatives
The Cisco Discovery Protocol ( CDP ) is a proprietary Data Link Layer network protocol developed by Cisco Systems.
Unidirectional Link Detection ( UDLD ) is a data link layer protocol from Cisco Systems to monitor the physical configuration of the cables and detect unidirectional links.
* Understanding and Configuring the Unidirectional Link Detection Protocol Feature at Cisco Systems
Cisco in its Signalling Link Terminals ( either standalone or integrated in another gateway ) uses RUDP for backhauling of SS7 MTP3 or ISDN signaling.
* Cisco Signaling Link Terminal
Cisco and proprietary
* Cisco Networking Services, a proprietary directory service-based management system for Cisco Systems ' networking products
It was a Cisco proprietary proposal, and was renamed " Label Switching ".
In addition, several other proprietary variations have been implemented by systems vendors, such as the totally stubby area ( TSA ) and the NSSA not so stubby area, both an extension in Cisco Systems routing equipment.
Enhanced Interior Gateway Routing Protocol-( EIGRP ) is a Cisco proprietary routing protocol loosely based on their original IGRP.
It can register with a Cisco Unified Communications Manager or Cisco Unified Communications Manager Express using either SIP or Cisco's proprietary Skinny Client Control Protocol.
It is a Cisco proprietary protocol that runs on port UDP / 4500.
* Media Convergence Server, a proprietary hardware product by Cisco Systems
RIP supports cross-platform distance vector routing whereas IGRP is a Cisco Systems proprietary distance vector routing protocol.
* Cisco Discovery Protocol, a proprietary layer 2 network protocol developed by Cisco Systems
The XTACACS protocol was developed by and is proprietary to Cisco Systems.
The Cisco 7920 supports Cisco's proprietary SCCP Skinny Client Control Protocol.
Hot Standby Router Protocol ( HSRP ) is a Cisco proprietary redundancy protocol for establishing a fault-tolerant default gateway, and has been described in detail in RFC 2281.
The Lightweight Extensible Authentication Protocol ( LEAP ) is a proprietary wireless LAN authentication method developed by Cisco Systems.
* Gateway Load Balancing Protocol-A Cisco Systems proprietary router redundancy protocol providing load balancing
* Hot Standby Routing Protocol-A Cisco Systems proprietary router redundancy protocol
Long Reach Ethernet ( LRE ) was a proprietary networking protocol marketed by Cisco Systems, intended to support multi-megabit ( 5 to 15 Mbit / s ) performance over telephone-grade unshielded twisted pair wiring over distances up to 5, 000 feet ( 1. 5 km ).
Cisco and VLAN
Cisco also implemented VLANs over FDDI by carrying VLAN information in an IEEE 802. 10 frame header, contrary to the purpose of the IEEE 802. 10 standard.
On Cisco Devices, VTP ( VLAN Trunking Protocol ) maintains VLAN configuration consistency across the entire network.
Cisco switches run an instance of STP for each VLAN, and since VTP propagates VLANs across the campus LAN, VTP effectively creates more opportunities for a bridging loop to occur.
** Cisco home page for Virtual LANs / VLAN Trunking Protocol ( VLANs / VTP ) ( discusses DSL, DTP, GVRP, ISL, VTP, 802. 1Q )
* ( Cisco Example ) VLAN Tagging
VLAN Trunking Protocol ( VTP ) is a Cisco proprietary protocol that propagates the definition of Virtual Local Area Networks ( VLAN ) on the whole local area network.
VSANs were designed by Cisco, modelled after the virtual local area network ( VLAN ) concept in Ethernet networking.
The primary goal of VMPS is VLAN assignment for general network management purposes, but can also be used for providing security through segregating clients with an unknown MAC address, or through further extension of the protocol to provide login for Cisco AClS.
This last functionality is now deprecated by Cisco, in favour of 802. 1x, and as the VMPS technology is Cisco only, the VLAN assignment can now be carried out in the 802. 1x framework.
ISL is Cisco's VLAN tagging protocol and is supported only on some Cisco equipment over Fast and Gigabit Ethernet links.
It is offered as an option to the IEEE 802. 1Q standard, a widely used VLAN tagging protocol, although the use of ISL for new sites is deprecated by Cisco.
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