HP Cisco Catalyst Blade Switch 3020 Cisco Catalyst Blade Switch 3020 for HP So - Page 373
ip dhcp snooping trust, option format-type circuit-id string
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Chapter 17 Configuring DHCP Features Configuring DHCP Features Step 5 Command Purpose ip dhcp snooping information option format remote-id [string ASCII-string | hostname] (Optional) Configure the remote-ID suboption. You can configure the remote ID to be: • String of up to 63 ASCII characters (no spaces) • Configured hostname for the switch Note If the hostname is longer than 63 characters, it is truncated to 63 characters in the remote-ID configuration. The default remote ID is the switch MAC address. Step 6 ip dhcp snooping information option allow-untrusted (Optional) If the switch is an aggregation switch connected to an edge switch, enable the switch to accept incoming DHCP snooping packets with option-82 information from the edge switch. The default setting is disabled. Note Enter this command only on aggregation switches that are connected to trusted devices. Step 7 interface interface-id Specify the interface to be configured, and enter interface configuration mode. Step 8 ip dhcp snooping vlan vlan information option format-type circuit-id string ASCII-string (Optional) Configure the circuit-ID suboption for the specified interface. Specify the VLAN and port identifier, using a VLAN ID in the range of 1 to 4094. The default circuit ID is the port identifier, in the format vlan-mod-port. You can configure the circuit ID to be a string of 3 to 63 ASCII characters (no spaces). Step 9 ip dhcp snooping trust (Optional) Configure the interface as trusted or untrusted. You can use the no keyword to configure an interface to receive messages from an untrusted client. The default setting is untrusted. Step 10 ip dhcp snooping limit rate rate (Optional) Configure the number of DHCP packets per second that an interface can receive. The range is 1 to 2048. By default, no rate limit is configured. Note We recommend an untrusted rate limit of not more than 100 packets per second. If you configure rate limiting for trusted interfaces, you might need to increase the rate limit if the port is a trunk port assigned to more than one VLAN on which DHCP snooping is enabled. Step 11 exit Return to global configuration mode. Step 12 ip dhcp snooping verify mac-address (Optional) Configure the switch to verify that the source MAC address in a DHCP packet that is received on untrusted ports matches the client hardware address in the packet. The default is to verify that the source MAC address matches the client hardware address in the packet. Step 13 end Return to privileged EXEC mode. Step 14 show running-config Verify your entries. Step 15 copy running-config startup-config (Optional) Save your entries in the configuration file. OL-8915-01 Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide 17-9
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