Cisco Systems OL-6240-02 Defining Advanced Server Parameters, Using Dynamic Bootp, Bootp Relay

Page 3

Chapter 22 Advanced DHCP Server Properties

Defining Advanced Server Parameters

Moving or Decommissioning BOOTP Clients

When you move or decommission a BOOTP client, you can re-use its lease. To decommission a BOOTP client, you must remove its lease reservation from the scope and force its lease to be available.

Force the lease available in the local cluster Web UI, or set scope name removeReservation and lease ipaddr force-availablein the CLI.

Using Dynamic BOOTP

When you use dynamic BOOTP, there are additional restrictions placed on the address usage in scopes, because BOOTP clients are allocated IP addresses permanently and receive leases that never expire.

If you are using DHCP failover, when a server whose scope does not have the dynamic-bootpoption enabled goes into PARTNER-DOWN state, it can allocate any available IP address from that scope, no matter whether it was initially available to the main or backup server. However, when the dynamic-bootpoption is enabled, the main server and backup servers can only allocate their own addresses. Consequently scopes that enable the dynamic-bootpoption require more addresses to support failover.

When using dynamic BOOTP:

1.Segregate dynamic BOOTP clients to a single scope. Disable DHCP clients from using that scope. In the local cluster Web UI, under the BOOTP attributes for the scope, disable the dhcp attribute. In the CLI, use scope name disable dhcp.

2.If you are using DHCP failover, set the failover-dynamic-bootp-backup-percentageattribute for the DHCP server to allocate a greater percentage of addresses to the backup server for this scope. This percentage can be as much as 50 percent higher than a regular backup percentage.

BOOTP Relay

Any router that supports BOOTP relay usually has an address that points to the DHCP server. For example, if you are using a Cisco router, it uses the term IP helper-address, which contains an address for a specific machine. In this case, use this address to forward all BOOTP (and therefore DHCP) broadcast packets. Be sure that you configure this address on the router closest to your host.

Tip If your DHCP clients are not receiving addresses from the DHCP server, check the network configuration, particularly the router or relay agent configuration, to verify that your network devices are set up to point to your Network Registrar DHCP server address.

Defining Advanced Server Parameters

You can set advanced DHCP server parameters, including custom DHCP options.

Setting Advanced DHCP Server Parameters

Table 22-1describes the advanced DHCP server parameters that you can set in the local cluster Web UI and CLI.

Cisco CNS Network Registrar User’s Guide

 

OL-6240-02

22-3

 

 

 

Page 2 Page 4
Image 3
Page 2 Page 4
Contents Configuring Bootp About Bootp22-1 22-2 Enabling Bootp for ScopesSetting Advanced Dhcp Server Parameters Moving or Decommissioning Bootp ClientsUsing Dynamic Bootp Bootp Relay22-4 Advanced Parameter Action Description22-5 22-6 Deferring Lease Extensions22-7 Integrating Windows System Management Servers22-8 Using Extensions to Affect Dhcp Server Behavior22-9 Unix22-10 Tuning the Dhcp Server22-11 Dhcp set activity-summary-interval22-12 Configuring Virtual Private Networks Using Dhcp22-13 Typical Virtual Private Networks22-14 Creating Virtual Private Networks22-15 Then22-16 VPN Usage22-17 Configuring Dhcp Subnet Allocation22-18 Setting Dhcp Forwarding VPN and Subnet Allocation Tuning Parameters22-19 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.
Top Page Image Contents