Hi. Let's discuss on how to setup a basic VTP configuration.
Network setup
Network setup
2 units of Cisco Catalyst 2950 are connected to each other via trunk port. SwitchA will be chosen as the VTP Server, SwitchB will be the VTP client.
Steps
1. This step is not compulsory. But to make it easier, I have reset my VLAN and VTP database to default settings. You can learn how to do it here.
2. Configure at least one trunk port on both switches, because VTP packets will use trunk port to communicate. In this case, I'm using port Fa0/8 on both switches as trunk port. ISL is not available on this switch, therefore, dot1q is used by default.
3. Verify your configuration. Make sure it's being set as trunk port. Catalyst 2950 is using dot1q as default trunking encapsulation, therefore, I don't need to configure it manually.
4. Now, let's configure VTP. Please make sure that the VTP domain name and VTP password is identical on both switches.
5. Now we have configured VTP on both switches. Let's confirm that by turning on VTP debug events. I noticed that, as soon as a VLAN is added, VTP Server will send a summary packet to its VTP client, less than a second.
a) A VTP summary packet is being transmitted by SwitchA (VTP Server) via its trunk port Fa0/8 to all switches within its domain (cisco).
b) A VTP summary packet is being received by SwitchB via its trunk port Fa0/8 from SwitchA.
6. VTP Revision number is now increased by 1 value (from 0 to 1), and we can see VLAN 100 is also added on SwitchB which was being added on SwitchA.
Conclusion
I hope this post will benefit you guys. Thank you for dropping by.
- Soulpower
Steps
1. This step is not compulsory. But to make it easier, I have reset my VLAN and VTP database to default settings. You can learn how to do it here.
SwitchA#sh vtp status
VTP Version : 2
Configuration Revision : 0 Maximum VLANs supported locally : 128 Number of existing VLANs : 5 VTP Operating Mode : Server VTP Domain Name : VTP Pruning Mode : Disabled VTP V2 Mode : Disabled VTP Traps Generation : Disabled MD5 digest : 0x57 0xCD 0x40 0x65 0x63 0x59 0x47 0xBD Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00 Local updater ID is 10.0.0.110 on interface Vl1 (lowest numbered VLAN interface found) |
| SwitchB#sh vtp status VTP Version : 2 Configuration Revision : 0 Maximum VLANs supported locally : 128 Number of existing VLANs : 5 VTP Operating Mode : Server VTP Domain Name : VTP Pruning Mode : Disabled VTP V2 Mode : Disabled VTP Traps Generation : Disabled MD5 digest : 0x57 0xCD 0x40 0x65 0x63 0x59 0x47 0xBD Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00 Local updater ID is 10.0.0.111 on interface Vl1 (lowest numbered VLAN interface found) |
| SwitchA(config)#int fa0/8 SwitchA(config-if)#switchport mode trunk SwitchA(config-if)#end |
| SwitchB(config)#int fa0/8 SwitchB(config-if)#switchport mode trunk SwitchB(config-if)#end |
| SwitchA#sh int f0/8 switchport Name: Fa0/8 Switchport: Enabled Administrative Mode: trunk Operational Mode: up Administrative Trunking Encapsulation: dot1q Negotiation of Trunking: On Access Mode VLAN: 1 (default) Trunking Native Mode VLAN: 1 (default) Voice VLAN: none Administrative private-vlan host-association: none Administrative private-vlan mapping: none Administrative private-vlan trunk native VLAN: none Administrative private-vlan trunk encapsulation: dot1q Administrative private-vlan trunk normal VLANs: none Administrative private-vlan trunk private VLANs: none Operational private-vlan: none Trunking VLANs Enabled: ALL Pruning VLANs Enabled: 2-1001 Capture Mode Disabled Capture VLANs Allowed: ALL Protected: false Appliance trust: none |
| SwitchB#sh int f0/8 switchport Name: Fa0/8 Switchport: Enabled Administrative Mode: trunk Operational Mode: up Administrative Trunking Encapsulation: dot1q Negotiation of Trunking: On Access Mode VLAN: 1 (default) Trunking Native Mode VLAN: 1 (default) Voice VLAN: none Administrative private-vlan host-association: none Administrative private-vlan mapping: none Administrative private-vlan trunk native VLAN: none Administrative private-vlan trunk encapsulation: dot1q Administrative private-vlan trunk normal VLANs: none Administrative private-vlan trunk private VLANs: none Operational private-vlan: none Trunking VLANs Enabled: ALL Pruning VLANs Enabled: 2-1001 Capture Mode Disabled Capture VLANs Allowed: ALL Protected: false Appliance trust: none |
| SwitchA(config)#vtp mode server Device mode already VTP SERVER. SwitchA(config)#vtp domain cisco Changing VTP domain name from NULL to cisco SwitchA(config)#vtp password cisco Setting device VLAN database password to cisco SwitchA(config)#end |
| SwitchB(config)#vtp mode client Setting device to VTP CLIENT mode. SwitchB(config)#vtp domain cisco Changing VTP domain name from NULL to cisco SwitchB(config)#vtp password cisco Setting device VLAN database password to cisco SwitchB(config)#end |
a) A VTP summary packet is being transmitted by SwitchA (VTP Server) via its trunk port Fa0/8 to all switches within its domain (cisco).
b) A VTP summary packet is being received by SwitchB via its trunk port Fa0/8 from SwitchA.
| SwitchA#debug sw-vlan vtp events vtp events debugging is on SwitchA# SwitchA(config)#vlan 100 SwitchA(config-vlan)#name ciscovlan SwitchA(config-vlan)#end SwitchA# 00:28:56: VTP LOG RUNTIME: Transmit vtp summary, domain cisco, rev 1, followers 1, tlv blk size 5 (inc #tlv field), MD5 digest calculated = 8D 6C F5 D2 A8 3D B0 F5 29 38 B0 A0 A7 01 6F EB 00:28:56: VTP LOG RUNTIME: Summary packet received, domain = cisco, rev = 1, followers = 1, length 77, trunk Fa0/8 00:28:56: VTP LOG RUNTIME: Summary packet rev 1 equal to domain cisco rev 1 00:28:56: VTP LOG RUNTIME: Subset packet received, domain = cisco, rev = 1, seq = 1, length = 228 |
| SwitchB#debug sw-vlan vtp events vtp events debugging is on SwitchB# 00:50:42: VTP LOG RUNTIME: Summary packet received, domain = cisco, rev = 1, followers = 1, length 77, trunk Fa0/8 00:50:42: VTP LOG RUNTIME: Summary packet rev 1 greater than domain cisco rev 0 00:50:42: VTP LOG RUNTIME: Domain cisco currently not in updating state 00:50:42: VTP LOG RUNTIME: pdu len 77, #tlvs 1 00:50:42: VTP LOG RUNTIME: Subset packet received, domain = cisco, rev = 1, seq = 1, length = 228 00:50:42: VTP LOG RUNTIME: Transmit vtp summary, domain cisco, rev 1, followers 1, tlv blk size 5 (inc #tlv field), MD5 digest calculated = 8D 6C F5 D2 A8 3D B0 F5 29 38 B0 A0 A7 01 6F EB |
| SwitchA#sh vtp status VTP Version : 2 Configuration Revision : 1 Maximum VLANs supported locally : 128 Number of existing VLANs : 6 VTP Operating Mode : Server VTP Domain Name : cisco VTP Pruning Mode : Disabled VTP V2 Mode : Disabled VTP Traps Generation : Disabled MD5 digest : 0x8D 0x6C 0xF5 0xD2 0xA8 0x3D 0xB0 0xF5 Configuration last modified by 10.0.0.110 at 3-1-93 00:28:56 Local updater ID is 10.0.0.110 on interface Vl1 (lowest numbered VLAN interface found) SwitchA#sh vlan VLAN Name Status Ports ---- -------------------------------- --------- ------------------------------- 1 default active Fa0/1, Fa0/5, Fa0/6, Fa0/7, Fa0/9, Fa0/10, Fa0/11, Fa0/12 100 ciscovlan active 1002 fddi-default act/unsup 1003 token-ring-default act/unsup 1004 fddinet-default act/unsup 1005 trnet-default act/unsup VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2 ---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------ 1 enet 100001 1500 - - - - - 0 0 100 enet 100100 1500 - - - - - 0 0 1002 fddi 101002 1500 - - - - - 0 0 1003 tr 101003 1500 - - - - - 0 0 1004 fdnet 101004 1500 - - - ieee - 0 0 1005 trnet 101005 1500 - - - ibm - 0 0 Remote SPAN VLANs ------------------------------------------------------------------------------ Primary Secondary Type Ports ------- --------- ----------------- ------------------------------------------ |
| SwitchB#sh vtp status VTP Version : 2 Configuration Revision : 1 Maximum VLANs supported locally : 128 Number of existing VLANs : 6 VTP Operating Mode : Client VTP Domain Name : cisco VTP Pruning Mode : Disabled VTP V2 Mode : Disabled VTP Traps Generation : Disabled MD5 digest : 0x8D 0x6C 0xF5 0xD2 0xA8 0x3D 0xB0 0xF5 SwitchB#sh vlan VLAN Name Status Ports ---- -------------------------------- --------- ------------------------------- 1 default active Fa0/1, Fa0/2, Fa0/3, Fa0/4, Fa0/5, Fa0/6, Fa0/7, Fa0/9, Fa0/10, Fa0/11, Fa0/12 100 ciscovlan active 1002 fddi-default act/unsup 1003 token-ring-default act/unsup 1004 fddinet-default act/unsup 1005 trnet-default act/unsup VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2 ---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------ 1 enet 100001 1500 - - - - - 0 0 100 enet 100100 1500 - - - - - 0 0 1002 fddi 101002 1500 - - - - - 0 0 1003 tr 101003 1500 - - - - srb 0 0 1004 fdnet 101004 1500 - - - ieee - 0 0 1005 trnet 101005 1500 - - - ibm - 0 0 Remote SPAN VLANs ------------------------------------------------------------------------------ Primary Secondary Type Ports ------- --------- ----------------- ------------------------------------------ |
- We can see that our VTP has been configured correctly, and we have verified that it's working fine as it should.
- Please be advised that VTP is a layer 2 Cisco Proprietary Protocol, please do not attempt to implement this on other switches. :)
I hope this post will benefit you guys. Thank you for dropping by.
- Soulpower
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