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The invention provides a method and device for updating an ARP cache.
The method comprises the steps that an ARP table item deletion message sent by a local host is received; after tunnel package is conducted on the ARP table item deletion message, the ARP table item deletion message is sent to a neighbor edge device, so that the neighbor edge device is directed to delete a locally-cached ARP table item corresponding to an aged MAC address carried in the ARP table item deletion message and broadcast the ARP table item deletion message to a local host of the neighbor edge device.
 In particular embodiments of the present invention as an example the beginning of the way of example, the host acquires the Al site A through MAC address of the host BI, it stores the corresponding relationship MAC_B1 IP_B1 upper edge switch A, according to the edge switch A said ARP entry is deleted messages and deletes the corresponding relationship MAC_B1 of IP_B1.
Site C is not the host obtains the MAC address of the host through the BI and not save the corresponding relationship MAC_B1 switch C IP_B1 upper edge, the edge switch C ignoring the ARP packet entry is deleted.
 Specifically, the edge switches A and C at the edge switch receives the ARP entry is deleted packets sent after the edge switch B, decapsulates the MAC address and the source from which to obtain the ARP entry is deleted packet, i.e., host MAC address aging MAC_B1 BI, and a source IP address, i.e.
MAC address aging BI host IP address corresponding MAC_B1 IP_B1.
On the other hand, the survival time of ARP entries typically require manual configuration, if a device requires a plurality of host entries ARP cache, then the need to collect the MAC address of each host survival time, and then takes a minimum value as the local ARP cache aging time.
 The message forwarding unit, configured to send to the neighbor edge device after deleting the ARP entry tunnel encapsulation packet to indicate that the neighbor edge device to delete the local cache entry is deleted ARP packet carries aging MAC address of the corresponding ARP entry, and the entry is deleted ARP broadcast packet to its local host.
 The embodiments of the present invention, when an edge EVI networking switch receives ARP packet neighbor entry is deleted when the edge device transmits, after the ARP entry deleted decapsulates the packet sent by the neighbor edge, Delete locally cached remove the ARP entry packet carries MAC address aging ARP entry, and the entry is deleted ARP packet is broadcast to the local host.
Embodiment  embodiment of the present invention, the entry is deleted ARP packet source IP address is the IP address of the host MAC address aging, the aging of the source MAC address is the MAC address, destination IP address is the IP address of the default destination MAC address is a broadcast MAC address.
According to the technical scheme, a flow black hole caused by aging of the MAC address is avoided and the complexity of the process that the APR cache aging time is manually configured by a network manager is reduced.
In this technique, the proposed ARP (Address Resolution Protocol, ARP) Pickup mechanism, by the edge device cache ARP entry site, other sites within the same host initiates an ARP request to find the edge of the device itself Cache ARP entry, directly respond to ARP requests.