Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Vla ns

231 views

Published on

  • Be the first to comment

  • Be the first to like this

Vla ns

  1. 1. VLANS packetlife.net 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 192.168.100.1 255.255.255.0 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

×