HP 6125XLG R2306-HP 6125XLG Blade Switch Layer 3 - IP Services Configuration G - Page 24
Configuring ARP snooping, Configuration procedure, Displaying and maintaining ARP snooping
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Configuring ARP snooping ARP snooping is used in Layer 2 switching networks. It creates ARP snooping entries by using information in ARP packets. If you enable ARP snooping on a VLAN, ARP packets received by any interface in the VLAN are redirected to the CPU. The CPU uses the sender IP and MAC addresses of the ARP packets, and receiving VLAN and port to create ARP snooping entries. The aging time and valid period of an ARP snooping entry are 25 minutes and 15 minutes. If an ARP snooping entry is not updated in 15 minutes, it becomes invalid and cannot be used. After that, if an ARP packet matching the entry is received, the entry becomes valid, and its aging timer restarts. If the aging timer of an ARP entry expires, the entry is removed. If the ARP snooping device receives an ARP packet that has the same sender IP address as a valid ARP snooping entry, but with a different sender MAC address, it assumes it has been attacked. The ARP snooping entry becomes invalid, and is removed after 25 minutes. Configuration procedure To enable ARP snooping for a VLAN: Step 1. Enter system view. 2. Enter VLAN view. 3. Enable ARP snooping Command system-view vlan vlan-id arp snooping enable Remarks N/A N/A By default, ARP snooping is disabled. Displaying and maintaining ARP snooping Execute display commands in any view and reset commands in user view. Task Display ARP snooping entries. Remove ARP snooping entries. Command display arp snooping [ vlan vlan-id ] [ slot slot-number ] [ count ] display arp snooping ip ip-address [ slot slot-number ] reset arp snooping [ ip ip-address | vlan vlan-id ] 15