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2. Subnetting
An Introduction to Creating, Updating, and Troubleshooting a Sub Network
Name – Jessica Drda
Title – Systems Support Engineer
Date - Arial Narrow 16pts

3. What is a switch?
What is a Hub? A hub is a repeater- will resend data out all ports. What is an Unmanaged Switch? An unmanaged switch can learn the network layout and transmit data to learned paths. It is meant to work without user configuration. What is a Managed Switch? A managed switch is configurable, allowing for more flexibility and traffic. They can be monitored via local or remote connection. What is a Router? Switches create the network. Routers connect networks. A router structures & manages the network, choosing the best path for information to travel.

4. Hardware Overview
Routing Capabilities: Stratix 5400, 5700, 8000, 8300 or other Layer 3 switch
Link to Rockwell Products: Networking Hardware Webpage

5. Device / Subnet Configuration
IP address:
Unique identifier used to communicate on Ethernet IP network
Subnet Mask:
Masks IP address and divides it into network address and host address.
All network bits set to 1, all host bits to 0.
Subnet Identifier (ID):
Designates network.
IP address with all host bits set to 0
Broadcast Address:
Logical address – messages sent to here are received by all hosts.
IP address with all host bits set to 1.

6. Classful IP addresses
With classful IP addressing, the class determined the range of the network. This was replaced by classless IP addressing in 1994.

7. Classless IP Addressing
With classless IP addressing, you choose a mask to fit the network.
# hosts = n
*subnet address
*broadcast address
CIDR: Classless Inter-Domain Routing

8. Private vs Public IP Addressing
Private Home use: computers, tablets, smart- devices, printer. Plant floor: dependent on configuration, but usually- everything on the internal side of your firewall & router To access end devices from a public space, NAT’ing should be used.
Public Without Network Address Translation in place, anything that needs to be publically accessible needs a public IP address. Talk to IT about your company’s reserved public IP addresses.

9. Scenario 1: Creating a Subnet
210 hosts
Need: h = 212
VLAN 200
/ 24
Subnet Address is
Broadcast Address is
Valid host address range is –

10. Demo: Command Line Interface
Tools for CLI: Console cable PuTTY Link to PuTTY Installer
Commands: enable show ip interface brief show run interface vlan 200 config terminal vlan interface vlan ip address

11. CIDR vs VLSM
CIDR: Classless Inter-Domain Routing IP Network designated by a Subnet ID and length of the mask VLSM: Variable Length Subnet Mask allows the user to implement different masks for each subnet

12. Scenario 2: Updating a Subnet
Existing Network: /24 Hosts in use Need a new subnet with 50 addresses
Update current network to:
& (Valid host range – 126)
New network:
VLAN 201
/26 (Valid host range )
Subnet Address
Broadcast Address

13. Networking Overview: OSI Model
For subnetting, focus on Layer 2 and Layer 3
Subnet Broadcast domain VLAN (Virtual LAN)
7. Application 6. Presentation 5. Session 4. Transport 3. Network 2. Data Link 1. Physical
Structures and manages network: including addressing & routing
Data frames between two physically connected nodes
Physical media: switches, ports, cables
“Are they on the same network?” refers not only to the physical connection, but to the data link layer as well.

14. Networking Overview: Data-Links
Units in Layer 3 are referred to as packets.
Units in Layer 2 are referred to as frames.
Layer 3 switches, Yes Routing
Layer 2 switches, No Routing
(still needs unique identifiers)

15. Layer 2 Port Configuration
Access: Configured VLAN only Frame is not tagged Trunk: Allows all VLAN traffic to communicate over a single link Native VLAN is untagged All other VLANs are tagged

16. Scenario 2: Port Config & New Switch
Switch2# show cdp neighbor detail
Device ID: Switch3
Entry address(es):
Platform: 1783-MS10T
Interface: FastEthernet 0/2 (outgoing): FastEthernet 01 (incoming)
(…)
Native VLAN: 1
Duplex: full
Switch2# show interface status
Port Name Status Vlan (…)
Fa0/1 connected 100
Fa0/2 err-disabled 100
(…)
Gi0/1 connected trunked
Switch2# show fa0/2
FastEthernet 0/2
switchport mode trunk
switchport trunk native vlan 100
Switch2# show cdp neighbor
Device ID Local Intrfce (…) Port ID
Switch1 Fa0/1 Fa0/1
Switch3 Fa0/2 Fa0/1
Router1 Gi0/1 Gi0/1

17. Scenario 3: VLAN Traffic
IP Interfaces:
VLAN IP Address
VLAN 201 T : : S1 S2 S3 H1
VLAN 201
/25 A A T T A H2
VLAN 200
/25
Gateway:
/25
Gateway:
/25

18. Scenario 4: Gateway Address Resolution
ARP : : S1 S2 S3 H1
VLAN 201
/25 H2
VLAN 200
/25
Gateway:
/25
Gateway:
/25
Layer 2
Layer 3

19. Reference Materials Rockwell Sources Network Address Translation:
Genius Webinar - NAT Using Stratix Switches
Routing:
Configuring routing with Stratix 5400/5700/8000/8300
Inter-VLAN routing using Stratix switches
External Sources
EtherField Information
Layer 2 Interface Configuration
ARP Tutorial

20. Thank you