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Virtual LAN Számítógép hálózatok gyakorlata

Virtual LAN Számítógép hálózatok gyakorlata. ÓBUDAI EGYETEM 2011 TAVASZI FÉLÉV 9. LABORGYAKORLAT PRÉM DÁNIEL. Virtual Local Area Network. VLAN ≠ WLAN Virtual LAN ( logically related network ) broadcast domain inside the switch

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Virtual LAN Számítógép hálózatok gyakorlata

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  1. Virtual LANSzámítógép hálózatok gyakorlata ÓBUDAI EGYETEM 2011 TAVASZI FÉLÉV 9. LABORGYAKORLAT PRÉM DÁNIEL

  2. Virtual Local Area Network • VLAN ≠ WLAN • Virtual LAN (logically related network)broadcast domain inside the switch • VLANsarestoredinthe VTP (VLAN trunkingprotocol) databases • Configurable parameters of VLANs: name, type, state • SomeVLANshave a distinguishedtask, otherscan be usedas arbitrarily (e.g.: 1 = management vlan) • Cisco VLAN ranges • normalrange: 1-1000 (configurablefrom 2) • extendedrange: 1025-4096

  3. Virtual Local Area Network • Machinesinthesame VLAN seeeach other as if they were in a normal LAN. • MachinesinseparateVLANsdon’tseetraffic of theother VLAN (notevenwhentheyareconnectedtoneighbouringportsonthesame switch – 2nd layer) • SeparateVLANscanonlycommunicateifthere is routingbetweenthem (sameas in normal LANs) – 3rd layer • VLANsneedconfiguratingonswitches and routersaswell

  4. VLAN Trunking • Makesit possible to multiplex the traffic of more than one logical networks on one cable • VLANID is usedtoseparate the traffic • Connectiontypes: • Access: 1 VLAN traffic • Trunk: MultipleVLANs batched (dot1Q -> IEEE 802.1q standard)

  5. VLAN configurationinrouters • Router(config)# interfaceFastEthernet X/Y • Router(config-if)# no shutdown • Router(config-if)# exit • Router(config)# interfaceFastEthernet X/Y.Z • Router(config-subif)# encapsulationdot1Q [VLAN] • Router(config-subif)# ipaddress[IP addr.] [subnetmask] • Router(config-subif)# no shutdown • Router(config-subif)# exit • Where: • X,Y: Interface ID • Z: Subinterface ID (usuallythe VLANID) • [VLAN]: The VLAN ID

  6. VLAN configurationonSwiches • Switch> enable • Switch# configureterminal • Switch(config)# vlan[VLAN] • Switch(config-vlan)# name[VLAN_NAME] • Switch(config-vlan)# exit • Where: • [VLAN]: is theVLAN ID • [VLAN_NAME] is thefriendlyname of the VLAN

  7. VLAN configuration on Swiches • //oneinterfaceSwitch(config)# interfaceFastEthernet X/Y • //interfacerangeSwitch(config)# interfacerangeFastEthernet X/Y-Z • Switch(config-if-range)# switchportaccessvlan [VLAN] • Switch(config-if-range)# no shutdown • Switch(config-if-range)# exit • Where: • X,Y: ID of thefirstinterface • Z: ID of thelastinterface • [VLAN]: The VLAN ID

  8. VLAN configuration on Swiches • //oneinterfaceSwitch(config)# interfaceFastEthernet X/Y • // interface rangeSwitch(config)# interfacerangeFastEthernet X/Y-Z • Switch(config-if-range)# switchportmodetrunk • Switch(config-if-range)# switchporttrunkallowedvlan add [VLAN 1] • Switch(config-if-range)# switchporttrunkallowedvlan add [VLAN 2] • Switch(config-if-range)# switchporttrunkallowedvlan add [VLAN N] • Where: • X,Y: ID of the first interface • Z: ID of the last interface • [VLAN]: The VLAN ID

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