Name: Cisco Catalyst 3750-X
Brand: Cisco
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Catalyst 3750-X and 3560-X Switch Command Reference

OL-29704-01

Chapter 2 Catalyst 3750-X and 3560-X Switch Cisco IOS Commands

ipv6 dhcp ping packets

Use the ipv6 dhcp ping packets global configuration command on the switch stack or on a standalone

switch to specify the number of packets a Dynamic Host Configuration Protocol for IPv6 (DHCPv6)

server sends to a pool address as part of a ping operation. To prevent the server from pinging pool

addresses, use the no form of this command.

ipv6 dhcp ping packets number

no ipv6 dhcp ping packets

Note This command is available only if you have configured a dual IPv4 and IPv6 Switch Database

Management (SDM) template on the switch. The command is not supported on switches running the

LAN base feature set.

Syntax Description

Defaults The default is 0.

Command Modes Global configuration

Command History

Usage Guidelines To configure the dual IPv4 and IPv6 template, enter the sdm prefer dual-ipv4-and-ipv6 {default | vlan}

global configuration command, and reload the switch.

The DHCPv6 server pings a pool address before assigning the address to a requesting client. If the ping

is unanswered, the server assumes, with a high probability, that the address is not in use and assigns the

address to the requesting client.

Setting the number argument to 0 turns off the DHCPv6 server ping operation.

Examples This example specifies two ping attempts by the DHCPv6 server before further ping attempts stop:

Switch(config)# ipv6 dhcp ping packets 2

number The number of ping packets sent before the address is assigned to a

requesting client. The range is 0 to 10.

Release Modification

12.2(46)SE This command was introduced.

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