Ch. 8: Implementing Ethernet Virtual LANs Flashcards Preview

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Flashcards in Ch. 8: Implementing Ethernet Virtual LANs Deck (32)
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The IEEE standardized protocol for VLAN trunking, which also includes RSTP details.



In campus LANs, an Ethernet segment over which the devices add a VLAN header that identifies the VLAN in which the frame exists.


trunking administrative mode

The configured trunking setting on a Cisco switch interface, as configured with the switchport mode command.


trunking operational mode

The current behavior of a Cisco switch interface for VLAN trunking.


virtual LAN (VLAN)

A group of devices, connected to one or more switches, with the devices grouped into a single broadcast domain through switch configuration. VLANs allow switch administrators to separate the devices connected to the switches into separate VLANs without requiring separate physical switches, gaining design advantages of separating the traffic without the expense of buying additional hardware.


VLAN Trunking Protocol (VTP)

A Cisco-proprietary messaging protocol used between Cisco switches to communicate configuration information about the existence of VLANs, including the VLAN ID and VLAN name.


VTP transparent mode

One of three VTP operational modes. Switches in transparent mode can configure VLANs, but they do not tell other switches about the changes, and they do not learn about VLAN changes from other switches.


multilayer switch

A LAN switch that can also perform Layer 3 routing functions. The name comes from the fact that this device makes forwarding decisions based on logic from multiple OSI layers (Layers 2 and 3).


access interface

A LAN network design term that refers to a switch interface connected to end-user devices, configured so that it does not use VLAN trunking.


trunk interface

A switch interface configured so that it operates using VLAN trunking (either 802.1Q or ISL).


data VLAN

A VLAN used by typical data devices connected to an Ethernet, like PCs and servers. Used in comparison to a voice VLAN.


voice VLAN

A VLAN defined for use by IP Phones, with the Cisco switch notifying the phone about the voice VLAN ID so that the phone can use 802.1Q frames to support traffic for the phone and the attached PC (which uses a data VLAN).


native VLAN

The one VLAN ID on any 802.1Q VLAN trunk for which the trunk forwards frames without an 802.1Q header.


default VLAN

A reference to the default setting of 1 (meaning VLAN ID 1) on the switchport access vlan vlan-id interface subcommand on Cisco switches, meaning that by default, a port will be assigned to VLAN 1 if acting as an access port.


static access interface

A LAN network design term, synonymous with the term access interface, but emphasizing that the port is assigned to one VLAN as a result of static configuration rather than through some dynamic process.


vlan (vlan-id)

Global config command that both creates the VLAN and puts the CLI into VLAN configuration mode


name (vlan-name)

VLAN subcommand that names the VLAN


[no] shutdown

VLAN mode subcommand that enables (no shutdown) or disables (shutdown) the VLAN


[no] shutdown vlan (vlan-id)

Global config command that has the same effect as the [no] shutdown VLAN mode subcommands


vtp mod {server | client | transparent | off}

Global config command that defines the VTP mode


switchport mode {access | dynamic {auto | desirable} | trunk}

Interface subcommand that configures the trunking administrative mode on the interface


switchport access vlan (vlan-id)

Interface subcommand that statically configures the interface into that one VLAN


switchport trunk encapsulation {dot1q | isl | negotiate}

Interface subcommand that defines which type of trunking to use, assuming that trunking is configured or negotiated


switchport trunk native vlan (vlan-id)

Interface subcommand that defines the native VLAN for a trunk port


switchport nonegotiate

Interface subcommand that disables the negotiation of VLAN trunking


switchport voice vlan (vlan-id)

Interface subcommand that defines the voice VLAN on a port, meaning that the switch uses 802.1Q tagging for frames in this VLAN


switchport trunk allowed vlan {add | all | except | remove} (vlan-list)

Interface subcommand that defines the list of allowed VLANs


show interfaces (interface-id) switchport

Lists information about any interface regarding administrative settings and operational state


show interfaces (interface-id) trunk

Lists information about all operational trunks (but no other interfaces), including the list of VLANs that can be forwarded over the trunk


show vlan [brief | id (vlan-id)| name (vlan-name) | summary]

Lists information about the VLAN