Configuration of Core Switch for Company Leased Line
A core switch for a leased line should be configured with routed interfaces, proper IP addressing, VLAN termination, and management access to ensure seamless connectivity between the corporate LAN and the ISP or remote branch.
Network Architecture Overview
A leased line provides a dedicated point-to-point connection between your company and an ISP or another branch office, ensuring reliable and secure data transfer . Typically, the leased line terminates at a CSU/DSU or managed router, which then connects to the core switch. The core switch acts as the distribution point for internal VLANs and routes traffic to the leased line for external communication .
Core Switch Configuration Steps
1. Interface Configuration
- Assign the interface connected to the leased line router as a routed interface (Layer 3).
- Example for Cisco Catalyst:
Switch(config)# interface GigabitEthernet0/1Switch(config-if)# no switchportSwitch(config-if)# ip address 192.168.1.2 255.255.255.252Switch(config-if)# no shutdown
- Use a /30 subnet for point-to-point links to minimize IP wastage .
2. VLAN and Routing Setup
- Terminate VLANs on the core switch if it also serves as a Layer 3 switch.
- Configure SVIs (Switched Virtual Interfaces) for internal VLANs:
Switch(config)# interface vlan 10Switch(config-if)# ip address 10.10.10.1 255.255.255.0Switch(config-if)# no shutdown
- Enable IP routing to allow traffic between VLANs and the leased line:
Switch(config)# ip routing
3. Default Route to ISP or Remote Branch
- Configure a default route pointing to the leased line router:
Switch(config)# ip route 0.0.0.0 0.0.0.0 192.168.1.1
- This ensures all outbound traffic uses the leased line as the primary path .
4. Management Access
- Assign a management IP to a dedicated VLAN for remote administration:
Switch(config)# interface vlan 99Switch(config-if)# ip address 10.10.99.1 255.255.255.0Switch(config-if)# no shutdown
- Enable Telnet or SSH for secure access. Configure ACLs to restrict access to trusted hosts.
5. Redundancy and Security Considerations
- If using multiple leased lines, configure HSRP/VRRP for gateway redundancy.
- Apply ACLs on the routed interface to control traffic from the leased line.
- Monitor the interface with SNMP or NetFlow for performance and SLA compliance .
Summary
To configure a core switch for a leased line:
- Connect the leased line router to a routed interface on the switch.
- Configure VLANs and SVIs for internal networks.
- Enable IP routing and set a default route to the leased line.
- Assign a management IP and secure access.
- Consider redundancy and monitoring for reliability.
This setup ensures efficient traffic flow, secure connectivity, and proper integration of the leased line into the company network .
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