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Vla ns


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Vla ns

  1. 1. VLANS Trunk Encapsulation Trunk Types 26 6 6 2 4 802.1Q ISL ISL Dest Source Header Size 4 bytes 26 bytes ISL Type FCS Header MAC MAC Trailer Size N/A 4 bytes Dest Source Standard IEEE Cisco Untagged Type MAC MAC Maximum VLANs 4094 1000 Dest Source 802.1Q 802.1Q Type VLAN Numbers MAC MAC 6 6 4 2 0 Reserved 1004 fdnet VLAN Creation 1 default 1005 trnetSwitch(config)# vlan 100 1002 fddi-default 1006-4094 ExtendedSwitch(config-vlan)# name Engineering 1003 tr 4095 Reserved Access Port Configuration TerminologySwitch(config-if)# switchport mode access TrunkingSwitch(config-if)# switchport nonegotiate Carrying multiple VLANs over the sameSwitch(config-if)# switchport access vlan 100 physical connectionSwitch(config-if)# switchport voice vlan 150 Native VLAN Trunk Port Configuration By default, frames in this VLAN are untagged when sent across a trunkSwitch(config-if)# switchport mode trunk Access VLANSwitch(config-if)# switchport trunk encapsulation dot1q The VLAN to which an access port is assignedSwitch(config-if)# switchport trunk allowed vlan 10,20-30Switch(config-if)# switchport trunk native vlan 10 Voice VLAN If configured, enables minimal trunking to SVI Configuration support voice traffic in addition to data traffic on an access portSwitch(config)# interface vlan100Switch(config-if)# ip address Dynamic Trunking Protocol (DTP) Can be used to automatically establish trunks VLAN Trunking Protocol (VTP) between capable ports (insecure)Domain Switched Virtual Interface (SVI)Common to all switches participating in VTP A virtual interface which provides a routed gateway into and out of a VLANServer ModeGenerates and propagates VTP advertisements to clients; Switch Port Modesdefault mode on unconfigured switches trunkClient Mode Forms an unconditional trunkReceives and forwards advertisements from servers; VLANs dynamic desirablecannot be manually configured on switches in client mode Attempts to negotiate a trunk with the far endTransparent Mode dynamic autoForwards advertisements but does not participate in VTP; Forms a trunk only if requested by the far endVLANs must be configured manually accessPruning Will never form a trunkVLANs not having any access ports on an end switch areremoved from the trunk to reduce flooded traffic Troubleshooting VTP Configuration show vlan show interface [status | switchport]Switch(config)# vtp mode {server | client | transparent}Switch(config)# vtp domain <name> show interface trunkSwitch(config)# vtp password <passsword>Switch(config)# vtp version {1 | 2} show vtp statusSwitch(config)# vtp pruning show vtp passwordby Jeremy Stretch v2.0