VTP Flashcards
What are the 3 modes of VTP?
Client- 1. Can’t modify, create of delete VLANs. 2. Forwards advertisments. 3. Only sends advertisements at bootup.
Server- Can modify, create of delete VLANs. 2. Originate VTP advertisments. 3. Accepts advertisements from Servers/Clients
Transparent- 1. Can modify, create of delete VLANs. 2. Does NOT advertise anything. 3. Forwards advertisments from other switches (does not look at them)
- Same as disabling VTP
- Needed for private VLAN. (can’t do private VLAN and VTP)
- Needed for extended VLAN 1006-4094
What does VTP do?
- Cisco Proprietary
- Used to Dynamicly to manage VLANs across multiple switches.
How does VTP Work?
- All Switches must belong to the same domain to exchange info.
- Server is the default mode.
- Highest revision # is considered newest DB. (a switch in client mode could update VLAN DB at bootup with higher Revision #)
- VTP is only advertised over Trunk Ports
Describe VTP version 1
- Supports VLAN 1-1005
- If a switch with version 1 detects a switch with version 3, the switch with version 1 will try to upgrade itself.
Describe VTP version 2
- supports VLAN 1-1005
- Consistenty checks when changes are made to VLAN or VTP configuration
- Transparent VTP switches will forward advertisments via trunk enen if domain name is different
Describe VTP version 3
- Into off mode
- able to disable VTP at port level
- Secure Mode
- Hidden (hash, not visable)
- Secret (encrypted)
- VTP Primary Server Feature
- Supports VLAN 1-4094
- Supports Private VLAN
What are 2 ways to reset the VTP reversion #?
- Change Domain Name
- Change mode to Transparent and back to desirered mode.
What are the 3 VTP advertisments types?
- Summary advertisments
- Subset advertisments
- client advertisment request
What do VTP summary advertisments contain?
- Domain
- Config Revision #
- MD5
- Timestamp
How often are VTP Summary advertisments sent?
- Every 5 minutes by VTP Server
- Everytime a DB change
What are VTP subset advertisments?
VLAN Config change
When would a VTP client advertisment request be sent?
- If the client switch VLAN DB comes corrupt
- If client DB get deleted
What is VTP Prunning?
When enabled a switch will not send broadcast, multicast and unicast down a trunk to another switch when it knows there is not a port with that VLAN on it.
What is the command to enable VPT Prunning?
(config)#vtp pruning