Brocade Communications Systems Brocate Ethernet Access Switch 6910 - Manual (Page 1087)

Brocade 6910 Ethernet Access Switch Configuration Guide 1037
53-1002581-01
Address Resolution Protocol
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Extensive use of Proxy ARP can degrade router performance because it may lead to increased
ARP traffic and increased search time for larger ARP address tables.
Interface
To configure the timeout for the ARP cache or to enable Proxy ARP for a VLAN (i.e., IP subnetwork):
1. Click IP, ARP.
2. Select Configure General from the Step List.
3. Set the timeout to a suitable value for the ARP cache, or enable Proxy ARP for subnetworks that
do not have routing or a default gateway.
4. Click Apply.
FIGURE 331 Configuring General Settings for ARP
Configuring Static ARP Addresses
For devices that do not respond to ARP requests or do not respond in a timely manner, traffic will
be dropped because the IP address cannot be mapped to a physical address. If this occurs, use the
IP > ARP (Configure Static Address – Add) page to manually map an IP address to the
corresponding physical address in the ARP cache.
CLI References
• “arp” on page 596
Command Usage
• The ARP cache is used to map 32-bit IP addresses into 48-bit hardware (that is, Media Access
Control) addresses. This cache includes entries for hosts and other routers on local network
interfaces defined on this router.
• You can define up to 32 static entries in the ARP cache.
• A static entry may need to be used if there is no response to an ARP broadcast message. For
example, some applications may not respond to ARP requests or the response arrives too late,
causing network operations to time out.
• Static entries will not be aged out or deleted when power is reset. You can only remove a static
entry via the configuration interface.