Cisco Systems OL-6240-02 manual Creating Virtual Private Networks, 22-14

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Chapter 22 Advanced DHCP Server Properties

Configuring Virtual Private Networks and Subnet Allocation

If the server-id-overridesuboption of the relay-agent-infooption (82) exists, the DHCP server uses its value to compare to that of the dhcp-server-identifieroption in the reply packet. Any packet that the DHCP client unicasts then goes directly to the relay agent and not to the server (which may, in fact, be inaccessible from the client). Both partners in a failover environment can renew a lease if the packet includes the server-id-overridesuboption.

Creating Virtual Private Networks

To set up the VPN and its index:

Step 1 Coordinate with the Cisco IOS relay agent administrator that the VPNs are configured either by VPN ID or VRF name on the relay agent. This will determine how to identify the VPN in Network Registrar.

Step 2 Create a VPN to allow provisioning DHCP clients onto the VPN that is configured in the IOS switch or router.

Enter a VPN index, which can be any unique text string except the reserved words all or global. Its associated ID must also be unique. To add an index:

•In the local cluster Web UI—Click DHCP, then VPNs. This opens the List/Add VPNs page. Give the VPN a numerical key identifier and a unique name in the cluster.

•In the regional cluster Web UI—Add the local cluster containing the VPN (click Clusters, then Cluster List). Then, click DHCP Configuration followed by VPNs. This opens the List/Add VPNs page (see Figure 22-1). You can create the VPN on this page or pull the VPN from the local clusters:

–If creating the VPN, give it a numerical key identifier and a unique name.

–If pulling the VPN from the local clusters, click Pull Replica VPNs on the List/Add VPNs page, then pull a specific VPN or all the VPNs from the selected cluster.

Figure 22-1 List/Add VPNs Page (Regional)

You can also push VPNs to the clusters by clicking Push VPN or Push All VPNs on the List/Add VPNs page. Then choose the synchronization mode and the clusters to which to push the VPNs on the Push VPN Data to Local Clusters page.

•In the CLI—Use vpn name create key. For example:

nrcmd> vpn blue create 99

 

Cisco CNS Network Registrar User’s Guide

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OL-6240-02

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Contents 22-1 Configuring BootpAbout Bootp Enabling Bootp for Scopes 22-2Bootp Relay Moving or Decommissioning Bootp ClientsUsing Dynamic Bootp Setting Advanced Dhcp Server ParametersAdvanced Parameter Action Description 22-422-5 Deferring Lease Extensions 22-6Integrating Windows System Management Servers 22-7Using Extensions to Affect Dhcp Server Behavior 22-8Unix 22-9Tuning the Dhcp Server 22-10Dhcp set activity-summary-interval 22-11Configuring Virtual Private Networks Using Dhcp 22-12Typical Virtual Private Networks 22-13Creating Virtual Private Networks 22-14Then 22-15VPN Usage 22-16Configuring Dhcp Subnet Allocation 22-1722-18 22-19 Setting Dhcp ForwardingVPN and Subnet Allocation Tuning Parameters 22-20

OL-6240-02 specifications

Cisco Systems OL-6240-02 is a highly regarded certification exam that delves into the realm of enterprise networking, particularly focusing on the Cisco Certified Network Professional (CCNP) Routing and Switching track. This particular exam serves as a critical test for network professionals aiming to validate their skills and knowledge in advanced routing technologies and network design.

One of the main features of OL-6240-02 is its emphasis on in-depth understanding of IP routing principles. Candidates are expected to demonstrate proficiency in configuring, maintaining, and troubleshooting complex routing protocols like OSPF (Open Shortest Path First), EIGRP (Enhanced Interior Gateway Routing Protocol), and BGP (Border Gateway Protocol). This includes comprehending routing algorithms, path selection, and the implementation of route redistribution, which are essential for optimizing network performance.

The exam also covers the characteristics of network security and infrastructure, where candidates must exhibit knowledge of implementing security protocols and best practices to safeguard network communications. This includes configuring virtual private networks (VPNs), utilizing access control lists (ACLs), and applying encryption techniques to secure data in transit.

Another crucial technology tested in OL-6240-02 is Quality of Service (QoS). Professionals must be adept at configuring QoS mechanisms to prioritize traffic, ensuring that critical applications receive the necessary bandwidth and latency requirements. This is increasingly important as businesses rely on a multitude of applications that have varying performance needs.

Cisco's emphasis on network automation and programmability is also a focal point of this certification. Candidates are expected to be familiar with using Cisco's software-defined networking (SDN) solutions and automation tools, which are essential for modern network management. This involves understanding how to leverage APIs and modeling tools to streamline network operations and enhance efficiency.

To succeed in OL-6240-02, candidates should possess a solid foundation in network fundamentals and have hands-on experience with Cisco devices. The certification not only validates expertise but also prepares professionals for real-world challenges in designing, implementing, and troubleshooting enterprise networks. Overall, OL-6240-02 is a stepping stone for network professionals seeking higher-level certifications and career advancements in the ever-evolving field of networking.
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