What is VLAN Trunking?
VLAN Trunking is the method by which we can share the vlan information accross switched network. The biggest benefit of this method is that there is no need of having different management of vlans and when created centrally are more managed. One more benefit of vlan trunking is that computers across the switched network comes under same vlan if there is cascading between switches.
*Trunking does not share member information.
Requirement for Trunking:
To establish trunking between vlans either tagging method or trunking protocol is required
Tagging method: Two types of tagging method:
1>ISL: This tagging method is used between CISCO switches.
2> IEEE 802.1Q or DOT1Q: This tagging method is used between CISCO & non - CISCO switches.
Trunking Protocol: Two types of trunking protocol:
1> DTP(Dynamic Trunking Protocol): DTP establishes automatic trunking when two switches having same tagging method are connected together.
2>VTP(Virtual Trunking Protocol): VTP is used to configure vlan trunking manually. To configure VTP three tings are required:
VTP mode
Domain
password
VTP mode:
Server: This is a default mode. This mode switch can create, delete & add the virtual Lan Information and that virtual lan information is then shared with trunk link.
Client: Client mode switch can receive the virtual Lan information from trunk link and accordingly changes its databases and then also shares with another trunk link. It cannot create or add vlan information.
VTP Domain: It is a logical boundry in which all the switches exists. VTP domain name is case sensitive.
Password: Password is required for secure transcations of vlans.
VLAN Trunking is the method by which we can share the vlan information accross switched network. The biggest benefit of this method is that there is no need of having different management of vlans and when created centrally are more managed. One more benefit of vlan trunking is that computers across the switched network comes under same vlan if there is cascading between switches.
*Trunking does not share member information.
Requirement for Trunking:
To establish trunking between vlans either tagging method or trunking protocol is required
Tagging method: Two types of tagging method:
1>ISL: This tagging method is used between CISCO switches.
2> IEEE 802.1Q or DOT1Q: This tagging method is used between CISCO & non - CISCO switches.
Trunking Protocol: Two types of trunking protocol:
1> DTP(Dynamic Trunking Protocol): DTP establishes automatic trunking when two switches having same tagging method are connected together.
2>VTP(Virtual Trunking Protocol): VTP is used to configure vlan trunking manually. To configure VTP three tings are required:
VTP mode
Domain
password
VTP mode:
Server: This is a default mode. This mode switch can create, delete & add the virtual Lan Information and that virtual lan information is then shared with trunk link.
Client: Client mode switch can receive the virtual Lan information from trunk link and accordingly changes its databases and then also shares with another trunk link. It cannot create or add vlan information.
VTP Domain: It is a logical boundry in which all the switches exists. VTP domain name is case sensitive.
Password: Password is required for secure transcations of vlans.
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