Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 464

Internet 10.1.2.4 17 Dell# 08:00:20:b7:bd:32 Ma 1/0 - CP Configuring ARP Inspection Trust Use the arp-inspection-trust command to specify a port or an interface as trusted so that ARP frames are not validated against the binding table. By default, this feature is disabled. • Enable ARP learning via gratuitous ARP. INTERFACE Mode INTERFACE PORT-CHANNEL Mode INTERFACE PORT EXTENDER Mode arp-inpsecton-trust Dell(conf)#int peGigE 0/0/0 Dell(conf-if-pegi-0/0/0)# arp-inpsection-trust Configuring ARP Timeout Use the arp backoff-timer command for setting the exponential timer for resending unresolved ARPs. • Set the exponential timer for resending unresolved ARPs. CONFIGURATION Mode arp backoff-time seconds / minutes Enter the number of seconds an ARP entry is black-holed. The range is from 1 to 3600. The default is 30 minutes. Enter the number of minutes an ARP entry is balck-holed. The range is from 0 to 35790. The default is 4 hours. Dell(conf)#arp backoff-time minutes Enabling Proxy ARP By default, Proxy ARP is enabled. To disable Proxy ARP, use the no ip proxy-arp command in the interface mode. To re-enable Proxy ARP, use the following command. • Re-enable Proxy ARP. INTERFACE mode ip proxy-arp To view if Proxy ARP is enabled on the interface, use the show config command in INTERFACE mode. If it is not listed in the show config command output, it is enabled. Only non-default information is displayed in the show config command output. Clearing ARP Cache To clear the ARP cache of dynamically learnt ARP information, use the following command. • Clear the ARP caches for all interfaces or for a specific interface by entering the following information. EXEC privilege IPv4 Routing 464