Arp Table - Dell Networking N4000 Series Configuration Manual

Stackable layer 2 and 3 switches

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Table 33-2. IP Routing Defaults (Continued)

Route Preference Values

ARP Table

The router maintains an ARP table that associates a MAC address and

outgoing port with an IP address and VLAN. The ARP table is dynamically

updated with the host MAC address and outgoing port information. ARP

entries are associated with the VLAN on which the IP address or route is

known. The router broadcasts an ARP request in the associated VLAN for any

unknown MAC address to which it needs to route packets. The router also

refreshes an ARP entry by sending an ARP request before a dynamically

learned ARP entry times out and updates the ARP table if a response is

received. Host or VM movement within the same VLAN (L2 topology

change) does not trigger an ARP refresh. Only if the ARP entry is timed out or

the port associated with the ARP entry goes down does the ARP entry get

If the traffic to a host is bidirectional, it will result in the host ARP entry

pointing to the new port. Any gratuitous ARP request sent by a host or VM

results in an ARP entry update (including a change in the MAC address and

outgoing port).

Configuring IP Routing

Default Value

Preference values are as follows:

• OSPF Intra—110

• OSPF Inter—110

• OSPF External—110

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