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- Cisco_Inter-Switch_Link abstract "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.ISL is Cisco's VLAN Encapsulation 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. In the case of ISL the tag is external to the Ethernet frame, which effectively is the same as encapsulating the Ethernet frame, whereas with IEEE 802.1Q the tag is internal. This is a key advantage for IEEE 802.1Q as it means tagged frames can be sent over standard Ethernet links.The size of an Ethernet encapsulated ISL frame can be expected to start from 94 bytes and increase up to 1548 bytes because of the overhead (additional fields) the protocol creates via encapsulation. ISL adds a 26-byte header (containing a 15-bit VLAN identifier) and a 4-byte CRC trailer to the frame. ISL functions at the Data-Link layer of the OSI model. ISL is used to maintain redundant links.Another related Cisco protocol, Dynamic Inter-Switch Link Protocol (DISL) simplifies the creation of an ISL trunk from two interconnected Fast Ethernet devices. Fast EtherChannel technology enables aggregation of two full-duplex Fast Ethernet links for high-capacity backbone connections. DISL minimizes VLAN trunk configuration procedures because only one end of a link needs to be configured as a trunk.".
- Cisco_Inter-Switch_Link wikiPageExternalLink technologies_tech_note09186a0080094665.shtml.
- Cisco_Inter-Switch_Link wikiPageID "2194106".
- Cisco_Inter-Switch_Link wikiPageRevisionID "577144255".
- Cisco_Inter-Switch_Link hasPhotoCollection Cisco_Inter-Switch_Link.
- Cisco_Inter-Switch_Link subject Category:Cisco_protocols.
- Cisco_Inter-Switch_Link type Abstraction100002137.
- Cisco_Inter-Switch_Link type CiscoProtocols.
- Cisco_Inter-Switch_Link type Communication100033020.
- Cisco_Inter-Switch_Link type Direction106786629.
- Cisco_Inter-Switch_Link type Message106598915.
- Cisco_Inter-Switch_Link type Protocol106665108.
- Cisco_Inter-Switch_Link type Rule106652242.
- Cisco_Inter-Switch_Link comment "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.ISL is Cisco's VLAN Encapsulation 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.".
- Cisco_Inter-Switch_Link label "Cisco Inter-Switch Link".
- Cisco_Inter-Switch_Link label "Cisco Inter-Switch Link".
- Cisco_Inter-Switch_Link label "Inter Switch Link".
- Cisco_Inter-Switch_Link label "Inter-Switch Link Protocol".
- Cisco_Inter-Switch_Link label "Inter-Switch Link".
- Cisco_Inter-Switch_Link label "Inter-Switch Link".
- Cisco_Inter-Switch_Link label "Inter-Switch Link".
- Cisco_Inter-Switch_Link sameAs Inter-Switch_Link_Protocol.
- Cisco_Inter-Switch_Link sameAs Inter_Switch_Link.
- Cisco_Inter-Switch_Link sameAs Cisco_Inter-Switch_Link.
- Cisco_Inter-Switch_Link sameAs Inter-Switch_Link.
- Cisco_Inter-Switch_Link sameAs Inter-Switch_Link.
- Cisco_Inter-Switch_Link sameAs m.06t_2c.
- Cisco_Inter-Switch_Link sameAs Q1665777.
- Cisco_Inter-Switch_Link sameAs Q1665777.
- Cisco_Inter-Switch_Link sameAs Cisco_Inter-Switch_Link.
- Cisco_Inter-Switch_Link wasDerivedFrom Cisco_Inter-Switch_Link?oldid=577144255.
- Cisco_Inter-Switch_Link isPrimaryTopicOf Cisco_Inter-Switch_Link.