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DHCPV4

  • 1 DHCPv4
    • 1.1 DHCPv4 overview
    • 1.2 DHCP Assist configuration
      • 1.2.1 How DHCP Assist works
      • 1.2.2 Configuring DHCP Assist
    • 1.3 Dynamic ARP Inspection Overview
      • 1.3.1 ARP Poisoning
      • 1.3.2 How Dynamic ARP Inspection Works
        • 1.3.2.1 ARP and DHCP Snoop Entries
      • 1.3.3 Configuration Notes and Feature Limitations for DAI
      • 1.3.4 Configuring Dynamic ARP Inspection
      • 1.3.5 Configuring Dynamic ARP Inspection on Multiple VLANs
      • 1.3.6 Disabling Syslog Messages for DAI
      • 1.3.7 Displaying ARP Information
      • 1.3.8 Configuring DAI to Support Multi-VRF
      • 1.3.9 Enabling Trust on a Port for a Specific VRF
    • 1.4 DHCP Snooping
      • 1.4.1 How DHCP Snooping Works
        • 1.4.1.1 DHCP Snooping Deployment over a LAG
        • 1.4.1.2 DHCP Binding Database
        • 1.4.1.3 Client IP-to-MAC address mappings
      • 1.4.2 System Reboot and the Binding Database
      • 1.4.3 Configuration Notes and Feature Limitations for DHCP Snooping
      • 1.4.4 Configuring DHCP Snooping
      • 1.4.5 Configuring DHCP Snooping on Multiple VLANs
      • 1.4.6 Displaying DHCPv4 Snooping Information
      • 1.4.7 Configuring DHCPv4 Snooping for Multi-VRF
    • 1.5 DHCP Relay Agent Information and Option 82 Insertion
      • 1.5.1 Configuration Notes for DHCP Option 82
      • 1.5.2 DHCP Option 82 Sub-options
        • 1.5.2.1 Sub-option 1: Circuit ID
        • 1.5.2.2 Sub-option 2: Remote ID
        • 1.5.2.3 Sub-option 6: Subscriber ID
      • 1.5.3 DHCP Option 82 Configuration
        • 1.5.3.1 Disabling or Re-enabling DHCP Option 82 Processing on an Interface
        • 1.5.3.2 Disabling DHCP Option 82 Globally and Re-enabling It for an Interface
        • 1.5.3.3 Disabling or Re-enabling DHCP Option 82 Processing on all VLAN Member Ports
        • 1.5.3.4 Changing the DHCP Relay Agent Forwarding Policy
        • 1.5.3.5 Configuring DHCP Snooping Relay Information Sub-options
        • 1.5.3.6 Displaying DHCP Option 82 Information
        • 1.5.3.7 Configuring the Source IP Address of a DHCP Client Packet on the DHCP Relay Agent
    • 1.6 IP Source Guard
      • 1.6.1 Configuration Notes and Feature Limitations for IP Source Guard
      • 1.6.2 Enabling IP Source Guard on a Port or Range of Ports
      • 1.6.4 Defining Static IP Source Bindings
      • 1.6.5 Enabling IP Source Guard for a VLAN
      • 1.6.6 Enabling IP Source Guard for a LAG Port for a VLAN
      • 1.6.7 Enabling IP Source Guard on Multiple VLANs
      • 1.6.8 Binding IP Source Guard ACLs to Ports
      • 1.6.11 Displaying Learned IP Addresses

DHCPv4

In this section:

  1. DHCPv4 overview
    The Dynamic Host Configuration Protocol for DHCPv4 enables DHCP servers to pass configuration parameters such as IPv4 addresses to IPv4 hosts.
  2. DHCP Assist configuration
  3. Dynamic ARP Inspection Overview
  4. DHCP Snooping
  5. DHCP Relay Agent Information and Option 82 Insertion
  6. IP Source Guard

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