Basic arp configuration, Figure 330 p – Brocade Communications Systems Brocate Ethernet Access Switch 6910 User Manual
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Brocade 6910 Ethernet Access Switch Configuration Guide
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Address Resolution Protocol
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Also, if the switch receives a request for its own IP address, it will send back a response, and also
cache the MAC of the source device's IP address.
Basic ARP Configuration
Use the IP > ARP (Configure General) page to specify the timeout for ARP cache entries, or to
enable Proxy ARP for specific VLAN interfaces.
CLI References
•
•
Command Usage
Proxy ARP
When a node in the attached subnetwork does not have routing or a default gateway configured,
Proxy ARP can be used to forward ARP requests to a remote subnetwork. When the router receives
an ARP request for a remote network and Proxy ARP is enabled, it determines if it has the best
route to the remote network, and then answers the ARP request by sending its own MAC address to
the requesting node. That node then sends traffic to the router, which in turn uses its own routing
table to forward the traffic to the remote destination.
FIGURE 330
Proxy ARP
Parameters
These parameters are displayed:
•
Timeout – Sets the aging time for dynamic entries in the ARP cache. (Range: 300 - 86400
seconds; Default: 1200 seconds or 20 minutes)
The ARP aging timeout can only be set globally for all VLANs.
The aging time determines how long dynamic entries remain in the cache. If the timeout is too
short, the switch may tie up resources by repeating ARP requests for addresses recently
flushed from the table.
When a ARP entry expires, it is deleted from the cache and an ARP request packet is sent to
re-establish the MAC address.
•
Proxy ARP – Enables or disables Proxy ARP for specified VLAN interfaces, allowing a
non-routing device to determine the MAC address of a host on another subnet or network.
(Default: Disabled)
End stations that require Proxy ARP must view the entire network as a single network. These
nodes must therefore use a smaller subnet mask than that used by the router or other relevant
network devices.
no routing,
no default
gateway
Remote
ARP Server
Proxy ARP
ARP
request