2. CCNA3-2 Chapter 3-2
VLAN TrunkingVLAN Trunking
• Concept trunking pertama kali digunakan di perusahaan
telephone.
• Multiple calls dipindahkan antara customers dan central
offices atau antar offices, dengan 1 physical connection.
3. CCNA3-3 Chapter 3-2
VLAN TrunkingVLAN Trunking
• Dengan prinsip yang sama, trunking diterapkan pada dataDengan prinsip yang sama, trunking diterapkan pada data
communications untuk memaksimalkan pemakaian jalur communicationcommunications untuk memaksimalkan pemakaian jalur communication
yang lebih baik secara bersama-sama.yang lebih baik secara bersama-sama.
• Keuntungan lainnya adalah penghematan cost, karena menggunakanKeuntungan lainnya adalah penghematan cost, karena menggunakan
jalur yang sama untuk komunikasi data dan voice.jalur yang sama untuk komunikasi data dan voice.
24 Channel T1 Line
with Data and Voice
4. CCNA3-4 Chapter 3-2
VLAN TrunkingVLAN Trunking
• Dengan prinsip yang sama juga, trunking diterapkan pada network yangDengan prinsip yang sama juga, trunking diterapkan pada network yang
menggunakan teknologi switching.menggunakan teknologi switching.
• TrunkTrunk merupakanmerupakan physical dan logicalphysical dan logical connections antara 2 switchesconnections antara 2 switches
yang melewatkan traffik network dari beberapan vlan network.yang melewatkan traffik network dari beberapan vlan network.
No trunkNo trunkNo trunkNo trunk
TrunkTrunkTrunkTrunk
5. CCNA3-5 Chapter 3-2
VLAN TrunkingVLAN Trunking
• Perlu diketahui link trunkPerlu diketahui link trunk
bukan milikbukan milik VLAN idVLAN id
tertentu.tertentu.
• Tanggungjawab dariTanggungjawab dari
link trunk adalah sebagailink trunk adalah sebagai
conduit/saluranconduit/saluran untukuntuk
VLANs.VLANs.
• DiantaraDiantara switchesswitches dandan
routersrouters, atau, atau
• DiantaraDiantara switchesswitches
dandan switchesswitches..
6. CCNA3-6 Chapter 3-2
VLAN TrunksVLAN Trunks
• What problem does it solve?What problem does it solve?
Network 172.17.10.0/24Network 172.17.10.0/24Network 172.17.10.0/24Network 172.17.10.0/24
Network 172.17.20.0/24Network 172.17.20.0/24Network 172.17.20.0/24Network 172.17.20.0/24
Network 172.17.99.0/24Network 172.17.99.0/24Network 172.17.99.0/24Network 172.17.99.0/24
Network 172.17.30.0/24Network 172.17.30.0/24Network 172.17.30.0/24Network 172.17.30.0/24
7. CCNA3-7 Chapter 3-2
IEEE 802.1Q Frame TaggingIEEE 802.1Q Frame Tagging
• Harus kita ingat bahwa switches adalah device Layer 2.
• Hanya menggunakan Ethernet frame header information untuk
berkomunikasi.
• Frame header tidak mengandung information mengenai VLAN
membership.
• Untuk itu VLAN membership (i.e. VLAN ID or VLAN Number) harus di
identifikasikan untuk setiap frame yang di lewatkan melalui trunk.
• Process ini dinamakan: “802.1Q VLAN Tagging”.
8. CCNA3-8 Chapter 3-2
IEEE 802.1Q Frame TaggingIEEE 802.1Q Frame Tagginghttp://www.cisco.com/en/US/tech/tk389/tk689/technologies_tech_note09186a0080094665.shtmlhttp://www.cisco.com/en/US/tech/tk389/tk689/technologies_tech_note09186a0080094665.shtml
6 6 2 1500 4
Destination
Address
Source
Address
Type /
Length
Data
Max of 1500 Bytes
FCS
6 6 2 2 2 1500 4
Destination
Address
Source
Address
802.1Q Tag
Type/
Length
Data
Max of 1500 Bytes
New
FCS8100 Tag
Length 1518 BytesLength 1518 BytesLength 1518 BytesLength 1518 Bytes
Length 1522 BytesLength 1522 BytesLength 1522 BytesLength 1522 Bytes
11. CCNA3-11 Chapter 3-2
Native VLANsNative VLANs
• Verify the configuration.Verify the configuration.
• VLAN 50 is a voice VLAN.VLAN 50 is a voice VLAN.
12. CCNA3-12 Chapter 3-2
Trunking OperationTrunking Operation
PC1 and PC3PC1 and PC3
send a broadcast.send a broadcast.
PC1 and PC3PC1 and PC3
send a broadcast.send a broadcast.
10101010
20202020
30303030
10101010
20202020
30303030
S2 receives the frames andS2 receives the frames and
‘tags’ them with the VLAN ID.‘tags’ them with the VLAN ID.
S2 receives the frames andS2 receives the frames and
‘tags’ them with the VLAN ID.‘tags’ them with the VLAN ID.
The tagged frames are sentThe tagged frames are sent
across the trunk links betweenacross the trunk links between
S2 and S1 and S1 and S3.S2 and S1 and S1 and S3.
The tagged frames are sentThe tagged frames are sent
across the trunk links betweenacross the trunk links between
S2 and S1 and S1 and S3.S2 and S1 and S1 and S3.
S3 strips the tags andS3 strips the tags and
forwards to the destination.forwards to the destination.
S3 strips the tags andS3 strips the tags and
forwards to the destination.forwards to the destination.
13. CCNA3-13 Chapter 3-2
Trunking ModesTrunking Modes
• A Cisco switch can be configured to supportA Cisco switch can be configured to support two typestwo types ofof
trunk ports:trunk ports:
• IEEE 802.1QIEEE 802.1Q
• ISLISL (Inter-Switch Link)(Inter-Switch Link)
• Supported by all catalyst switches except 29XX seriesSupported by all catalyst switches except 29XX series
• Today only 802.1Q is used.Today only 802.1Q is used.
• Legacy networks may still use ISL.Legacy networks may still use ISL.
14. CCNA3-14 Chapter 3-2
Trunking ModesTrunking Modes
• IEEE 802.1Q trunk port is:
• Mendukung tagged dan untagged traffic secara simultan.
• Dilakukan oleh default PVID. (Port VLAN ID)
• Untagged traffic:
• Di assosiasikan dengan port default PVID.
• Null atau untagged VLAN ID traffic merupakan milik
default PVID.
• VLAN ID sama dengan port default PVID dikirim
keluar sebagai untagged.
• Tagged traffic:
• Semua traffic lainnya dikirim dengan VLAN tag.
15. CCNA3-15 Chapter 3-2
Trunking ModesTrunking Modes
• ISL (Inter-Switch Link):
• Semua paket yang diterima akan di-encapsulated dengan
ISL header.
• Semua transmitted packets dikirim dengan ISL header.
• Untagged frames yang dikirim dari ISL trunk port akan di
dropped.
• No longer recommended or supported.
• 30 bytes of overhead for each frame…..
16. CCNA3-16 Chapter 3-2
Trunking ModesTrunking Modes
• Dynamic Trunking Protocol (DTP):
• Cisco proprietary protocol.
• Negosiasi both status & trunk encapsulation dari trunk
ports
• Switches dari vendors lain tidak support DTP.
• Secara auto akan enable pada port switch ketika mode
trunking tertentu dikonfigurasi pada port switch tersebut.
• DTP manages trunk negotiation only if the port on the
other switch is configured in a trunk mode that supports
DTP.
• DTP supports both ISL and 802.1Q trunks.
• Some Cisco switches and routers (older versions) do not
support DTP.
17. CCNA3-17 Chapter 3-2
Trunking ModesTrunking Modeshttp://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide/layer2.htmlhttp://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide/layer2.html
Mode Dynamic Trunking Protocol (DTP):Mode Dynamic Trunking Protocol (DTP):
•Dynamic Auto: (switchport mode dynamic auto)
• The switch port periodically sends DTP frames to the
remote port. Dan mengiklankan ke remote port bahwa dia
bisa berubah ke mode trunk, tetapi tidak meminta remote
port untuk berubah ke trunk state. (enable on default)
•On (default/standart): (switchport mode trunk)
• Periodically sends DTP advertisements to the remote port
and remote port dynamically changing to a trunking state.
•Dynamic Desirable: (switchport mode dynamic desirable)
• DTP frames are sent periodically to the remote port. It
advertises to the remote switch port that it is able to trunk and
asks the remote switch port to go to the trunking state.
18. CCNA3-18 Chapter 3-2
Trunking ModesTrunking Modes
• Dynamic Trunking Protocol (DTP):Dynamic Trunking Protocol (DTP):
• Turn off DTP:Turn off DTP: ((switchport nonegogiateswitchport nonegogiate))
• The local port does not send out DTP frames to theThe local port does not send out DTP frames to the
remote port.remote port.
• Mengakibatkan Local port akan berada pada kondisiMengakibatkan Local port akan berada pada kondisi
Unconditional TrunkingUnconditional Trunking state.state.
• Use this feature when you need to configure a trunkUse this feature when you need to configure a trunk
with a switch from another switch vendorwith a switch from another switch vendor..
19. CCNA3-19 Chapter 3-2
Virtual Local Area NetworksVirtual Local Area Networks
Configure VLANs and TrunksConfigure VLANs and Trunks
““Let's look at the lab”Let's look at the lab”
20. CCNA3-20 Chapter 3-2
Configure VLANs and TrunksConfigure VLANs and Trunks
• Overview:Overview:
1.1. Create the VLANs.Create the VLANs.
2.2. Assign switch ports to VLANs statically.Assign switch ports to VLANs statically.
3.3. Verify VLAN configuration.Verify VLAN configuration.
4.4. Enable trunking on the inter-switch connections.Enable trunking on the inter-switch connections.
5.5. Verify trunk configuration.Verify trunk configuration.
21. CCNA3-21 Chapter 3-2
Configure a VLANConfigure a VLAN
• Command Syntax:Command Syntax:
S1#S1#configure terminalconfigure terminal
S1(config)#S1(config)#vlanvlan vlan idvlan id
S1(config-vlan)#S1(config-vlan)#namename vlan namevlan name
S1(config-vlan)#S1(config-vlan)#endend
23. CCNA3-23 Chapter 3-2
Configure a VLANConfigure a VLAN
Assign switch ports to a VLANAssign switch ports to a VLANAssign switch ports to a VLANAssign switch ports to a VLAN
24. CCNA3-24 Chapter 3-2
Configure a VLANConfigure a VLAN
Verify VLAN configurationVerify VLAN configurationVerify VLAN configurationVerify VLAN configuration
25. CCNA3-25 Chapter 3-2
Managing VLANsManaging VLANs
OtherOther show vlanshow vlan command optionscommand optionsOtherOther show vlanshow vlan command optionscommand options
27. CCNA3-27 Chapter 3-2
Managing VLANsManaging VLANs
Manage VLAN MembershipsManage VLAN MembershipsManage VLAN MembershipsManage VLAN Memberships
Remove port VLAN membership.Remove port VLAN membership.Remove port VLAN membership.Remove port VLAN membership.
28. CCNA3-28 Chapter 3-2
• If you remove the VLANIf you remove the VLAN before removing the portbefore removing the port
membershipmembership assignments, the portsassignments, the ports become unusablebecome unusable untiluntil
you issue theyou issue the no switchport access vlanno switchport access vlan command.command.
Managing VLANsManaging VLANs
Manage VLAN MembershipsManage VLAN MembershipsManage VLAN MembershipsManage VLAN Memberships
Remove a VLANRemove a VLANRemove a VLANRemove a VLAN
Remove port VLAN membership.Remove port VLAN membership.Remove port VLAN membership.Remove port VLAN membership.
29. CCNA3-29 Chapter 3-2
Managing VLANsManaging VLANs
• Restoring to Factory Defaults:Restoring to Factory Defaults:
• To remove all VLAN configuration:To remove all VLAN configuration: VLANVLAN
configurationconfiguration
stored here.stored here.
VLANVLAN
configurationconfiguration
stored here.stored here.
32. CCNA3-32 Chapter 3-2
Configure a Trunk (p149)Configure a Trunk (p149)
The native VLAN mustThe native VLAN must
match onmatch on bothboth switches.switches.
The native VLAN mustThe native VLAN must
match onmatch on bothboth switches.switches.
35. CCNA3-35 Chapter 3-2
Managing a Trunk ConfigurationManaging a Trunk Configuration
• Pruning:Pruning:
• The process of specifying the traffic that will be allowed toThe process of specifying the traffic that will be allowed to
traverse the trunk link.traverse the trunk link.
• Use the command:Use the command:
switchport trunk allowed vlan addswitchport trunk allowed vlan add vlan-listvlan-list
• TheThe vlan-listvlan-list is a list of the VLAN IDs, separated byis a list of the VLAN IDs, separated by
commas, that will be allowed to use the trunk link.commas, that will be allowed to use the trunk link.
• The lists must match on both switches.The lists must match on both switches.
36. CCNA3-36 Chapter 3-2
Common Problems with TrunksCommon Problems with Trunks
• Native VLAN mismatches:Native VLAN mismatches:
• Trunk ports are configured with different native VLANs.Trunk ports are configured with different native VLANs.
• Trunk Mode mismatches:Trunk Mode mismatches:
• One trunk port is configured with trunk modeOne trunk port is configured with trunk mode offoff and theand the
other with trunk modeother with trunk mode onon..
• VLANs and IP Subnets:VLANs and IP Subnets:
• End user devices configured with incorrect IP addressesEnd user devices configured with incorrect IP addresses
will not have network connectivity. Each VLAN is awill not have network connectivity. Each VLAN is a
logically separate IP subnetwork. Devices within thelogically separate IP subnetwork. Devices within the
VLAN must be configured with the correct IP settings.VLAN must be configured with the correct IP settings.
• Allowed VLANs on trunks:Allowed VLANs on trunks:
• The list of allowed VLANs on a trunk does not match onThe list of allowed VLANs on a trunk does not match on
both ends of the trunk.both ends of the trunk.
