The hardware rate limits DHCP packets sent to the CPU from interfaces to 64 Kbps.

The DHCP snooping application processes incoming DHCP messages. For DHCPRELEASE and DHCPDECLINE messages, the application compares the receive interface and VLAN with the client interface and VLAN in the bindings database. If the interfaces do not match, the application logs the event and drops the message. For valid client messages, DHCP snooping compares the source MAC address to the DHCP client hardware address. When there is a mismatch, DHCP snooping logs and drops the packet. The network administrator can disable this feature using the no ip dhcp snooping verify mac-addresscommand. DHCP snooping forwards valid client messages on trusted members within the VLAN. If DHCP relay co-exists with DHCP snooping, DHCP client messages are sent to DHCP relay for further processing.

The DHCP snooping application uses DHCP messages to build and maintain the binding's database. The binding's database only includes data for clients on untrusted ports. DHCP snooping creates a tentative binding from DHCP DISCOVER and REQUEST messages. Tentative bindings tie a client to a port (the port where the DHCP client message was received). Tentative bindings are completed when DHCP snooping learns the client's IP address from a DHCP ACK message on a trusted port. DHCP snooping removes bindings in response to DECLINE, RELEASE, and NACK messages. DHCP Snooping application ignores the ACK messages as reply to the DHCP Inform messages received on trusted ports. The administrator can also enter static bindings into the binding database.

The DHCP binding database resides on a configured external server or locally in flash depending upon the user configuration. When a switch learns of new bindings or when it loses bindings, the switch immediately updates the entries in the database. The switch also updates the entries in the bindings file. The frequency at which the file is updated is based on a configurable delay, and the updates are batched.

If the absolute lease time of the snooping database entry expires, the entry is removed. If the system time is not consistent across reboots, snooping entries will not expire properly. If a host sends a DHCP release while the switch is rebooting, when the switch receives the DHCP discovery or request, the client's binding will go to the tentative binding.

Switching Configuration

57

Page 57
Image 57
Dell 6200 SERIES manual Switching Configuration

6200 SERIES specifications

The Dell 6200 Series is a notable line of workstations designed for professionals seeking powerful computing solutions in fields such as engineering, architecture, and design. With its robust architecture and advanced technology, this series stands out for its ability to handle demanding applications while offering reliability and performance.

One of the key features of the Dell 6200 Series is its powerful processing capabilities. It typically includes Intel Xeon processors, which provide multiple cores to manage multitasking efficiently. This allows users to run complex simulations or render high-resolution graphics without experiencing lag or slowdown. The processors are designed for optimal thermal management, allowing for sustained performance during extended work sessions.

Another significant aspect of the Dell 6200 Series is its graphics capabilities. These workstations often come equipped with NVIDIA or AMD professional-grade graphics cards, ensuring that they are equipped to handle graphically intensive tasks, such as 3D modeling and video editing. The support for advanced rendering technologies allows professionals to work with high-fidelity visuals and complex datasets with ease.

In terms of expandability, the Dell 6200 Series is designed with flexibility in mind. Users can customize their workstations with a range of configurations, including varied RAM capacities and storage options. This flexibility ensures that the workstation can be tailored to meet the specific requirements of different workloads. The incorporation of Solid State Drives (SSDs) enhances data access speeds, significantly improving boot times and overall system responsiveness.

Additionally, the Dell 6200 Series includes comprehensive connectivity options to facilitate integration with various peripherals and networks. With multiple USB ports, Ethernet ports, and support for multiple display outputs, users can connect to external devices easily, promoting an efficient workflow.

Security features are also a priority in this series. The workstations typically include advanced security measures, such as TPM (Trusted Platform Module) technology, which helps protect sensitive data through hardware encryption and secure storage.

Overall, the Dell 6200 Series delivers a blend of power, flexibility, and security that makes it an excellent choice for professionals in need of a dependable workstation. With its advanced technologies and ample expansion options, users can feel confident that their equipment can handle both current and future demands, making it a smart investment for any professional environment.