Implementing VLANs and Trunks

Applying IP Address Space in the Enterprise Network:

A model framework is used for designing and deploying in the networks is provided by the Cisco enterprise architecture model. It also used to provide the overlaying hierarchical IP addressing scheme in the ideal structure in the addressing scheme there are some of the guidelines which are shown below:

• In the corresponding to a single VLAN of a single IP subnet. And in the each broadcast domain VLAN is a separate,

• At the certain building distribution layer, and then there will be a continuation in the assign network numbers in the contiguously to the access layer of the devices.

• Design the various IP addressing in the scheme of the various blocks in the 2ⁿ contiguous network of the numbers (such as the 4, 8, 16, 32, 64 and so on) to be assigned in the certain building access and the distribution of the switch block.

• Subnet is the same sort of the same binary values in all the networks of to avoid the variable-length in the subnet masks and when it’s possible.

Example: Network Design

 The following table shows the example of approximately 250 various employees are migrating into the Cisco Enterprise Architecture.

Departments’	Users In Numbers	Location
Accounting	26	Building C
Finance	18	Building C
Sales	102	Building B
Human Resources	10	Building A
IT	45	Building A
Marketing	29	Building B

Here there is a requirement for the Six VLANs in order to accommodate the one VLAN as per the user community. The guidelines for the following are the Cisco Enterprise Architecture, and they is a requirement of the six IP subnets.

And here the business took its base address as the 10.0.0.0 to use the network.

And for the future growth in the system and to accommodate it, there occurs the one block of an IP addresses in a building and these are shown as below.

• And the allocation of Building A is 10.1.0.0/16.
• And the allocation of Building B is 10.2.0.0/16.
• And the allocation of Building C is 10.3.0.0/16.

In the all sort of departments the sales department was the largest, and it requires of 102 addresses for the users. A subnet mask of around 255.255.255.0 (/24) was chosen and thus it provide a maximum number in subnet for 254 hosts

The following tables shows the allocation of the IP and VLANs subnets in the building of A, B and C.

In Building A: IP and the VLANs Subnets:

Department	VLAN	IP Subnet Address
IT	VLAN 11	10.1.1.0/24
Human Resources	VLAN 12	10.1.2.0/24
And for future growth		10.1.3.0-10.1.255.0

In Building B: VLANs subnets and IP Subnets:

Department	VLAN	IP Subnet Address
Sales	VLAN 21	10.2.1.0/24
Marketing	VLAN 22	10.2.2.0/24
And for future growth		10.2.3.0-10.2.255.0

In Building C: VLANs and IP Subnets:

Department	VLAN	IP Subnet Address
Finance	VLAN 31	10.3.1.0/24
Accounting	VLAN 32	10.3.2.0/24
And for future growth		10.3.3.0-10.3.255.0

Network devices are managed by the some of the currently unused VLANs and the IP subnets. And if the company administration was intended and implemented the IP telephony,  consider as an example and then the unused VLANs and the IP subnets are allocated to the voice of the VLANs.