CCNA- part 9 vlan


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CCNA- part 9 vlan

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  • Note: The 1900 only supports ISL trunking.
    ISL is Cisco proprietary. 802.1Q is an IEEE standard.
    Other trunk types:
    LANE (VLANSs over ATM)
    802.10 (FDDI trunk)
  • CCNA- part 9 vlan

    1. 1. VLAN Virtual Local Area Network
    2. 2. 1 Broadcast Domain A B E0 E1 C E2 E3 D B 4 Collision Domains
    3. 3. VLAN Overview • It is layer 2 (data-link) security. • It divides a single broadcast domain in to multiple broadcast domain. • By default all ports of switch are in VLAN-1, is known as administrative VLAN or management VLAN. • VLAN can be created from 2 – 1001. • A single VLAN can span several switches
    4. 4. Advantages of VLAN:- • Broadcast control. • Security. • Flexibility. • Scalability.
    5. 5. 2 Broadcast Domains A B E0 E1 C E2 E3 D B 4 Collision Domains
    6. 6. VLAN Operations:- • Each logical VLAN is like a separate physical bridge. • Each VLAN have separate broadcast domain. • For inter VLAN communication Router is required. Switch A Green VLAN Black VLAN Blue VLAN
    7. 7. Size of VLANs • The size of VLANs depends on – Traffic patterns. – Types of applications. – Number of computers. – IP addressing scheme used .
    8. 8. Types of VLAN:- • There are two types or membership of VLAN :- 1.Static VLANs. 2.Dynamic VLANs.
    9. 9. Static VLAN:- • Static VLAN works with port numbers. • Administrator manually add ports numbers in the VLAN. • Configuration is easy to setup and monitor. Static VLAN Port e0/4 VLAN5
    10. 10. Static VLAN Configuration:- On 1900 series Switch:- Creation of VLAN:- Switch#config t Switch(Config)# vlan < vlan id > name < vlan name> Assigning port in VLAN:- Switch#config t Switch(Config)# int ethernet <interface no> Switch(Config-if)# vlan-membership static <vlan id>
    11. 11. Configuration continue……… • On 2900 series Switch:- Creation of VLAN:- – Switch # vlan database – Switch(vlan)# vlan <vlan id> name <vlan name> – Switch(vlan)#exit Assigning port in VLAN:- – Switch#config t – Switch(config)# int fastethernet <int no> – Switch(config-if)# switchport mode access – Switch(config-if)# switchport access vlan <vlan id> • Verify using show vlan
    12. 12. Dynamic VLAN:- Dynamic VLAN Port e0/9 VLAN10 MAC = 1111.1111.1111 VMPS 1111.1111.1111 = VLAN 10 •Dynamic VLAN works with MAC address. •Administrator adds only MAC address in VLAN. •By using VMPS (VLAN management policy server) dynamic VLAN will work. •VMPS contains MAC Address and respective VLAN number.
    13. 13. VLAN Identification:- • A single VLAN can span several switches • Frame identification – (frame tagging ) uniquely assigns a user defined id to a frame as it crosses a switch
    14. 14. Types of Links:- • Access links:- – member of only one VLAN (native VLAN of that port) – frames are untagged when traveling on this link • Trunk links:- – can carry traffic of many VLANs – configured between two switches or between a switch and a router – frames are tagged to identify the VLAN they belong to • Hybrid link:- – can carry both tagged and untagged frames
    15. 15. VLAN frame identification methods • ISL (Inter Switch Link – Cisco proprietary) over Fast Ethernet:- • IEEE 802.1q over Fast Ethernet.
    16. 16. ISL trunks enable VLANs across a 16 ISL Tagging backbone. – Cisco proprietary – Not intrusive to client stations; client does not see the ISL header – Effective between switches, routers and switches, and switches and servers with ISL network interface cards – 30 Byte tag will add to original frame. VLAN Tag Added by Incoming Port VLAN Tag Stripped by Forwarding Port Inter-Switch Link Carries VLAN Identifier
    17. 17. IEEE 802.1q Frame Tagging:- • Created by the IEEE as a standard method or frame tagging. • Open standard, we can use on different vendors switches. • Supports 4096 VLANs. • Unlike ISL , 802.1q does not encapsulate the frame . It modifies the existing Ethernet frame to include the VLAN ID • Only 4 Byte tag will add to original frame.
    18. 18. Trunk Configuration:- • 1900 series switch:- – Switch(config)# int fastethernet <int no> – Switch(config-if)# trunk on • 2900 series switch:- – Switch(config)# int fastethernet <int no> – Switch(config-if)#switchport mode trunk – Switch(config-if)#switchport trunk allowed-vlan <vlan range> encapsulation {dot1q | isl |negotiate}
    19. 19. VTP(VLAN Trunking Protocol):- • A protocol Cisco created to maintain VLAN configuration consistency throughout the network • Supports accurate VLAN tracking and monitoring • Dynamic reporting of added VLANs • “Plug-and-play” configuration when adding new VLANs
    20. 20. VTP Modes of operation:- • Server mode:- 1.Default for all catalyst switches. 2. in server we can create, add, or delete the VLANs in a VTP domain. 3. Configuration stored in NVRAM. • Client mode:- 1.Receive the information from VTP server. 2.client can not make any changes. 3. Configuration stored in RAM • Transparent mode:- 1.Do not participate in the VTP domain, but they still forward VTP advertisements through any trunk. 2. Configuration stored in NVRAM.
    21. 21. E.g. of VTP:- 3rd Floor 2nd Floor 1st Floor Sales HR ENG Server Client