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Figure 25-3. Configuring mac-address-table station-move refresh-arp Command
MAC Move Optimization
MAC Move Optimization is supported only on platform: e
Station-move detection takes 5000ms because this is the interval at which the detection algorithm runs. On
the E-Series, you can reduce detection time to as little as 500ms using the command
mac-address-table
station-move threshold time-interval (though at the expense of CPU resources).
threshold is the number of times a station move must be detected in a single interval in order to trigger a
system log message. For example, if you configure
mac-address-table station-move threshold 2
time-interval 5000, and 4 station moves occur in 5000ms, then two log messages are generated.
Microsoft Clustering
Microsoft Clustering is supported only on platform: e
Microsoft Clustering allows multiple servers using Microsoft Windows to be represented by one MAC
address and IP address in order to provide transparent failover or balancing. FTOS does not recognize
server clusters by default; it must be configured to do so.
Default Behavior
When an ARP request is sent to a server cluster, either the active server or all of the servers send a reply,
depending on the cluster configuration. If the active server sends a reply, the Dell Force10 switch learns the
active server’s MAC address. If all servers reply, the switch registers only the last received ARP reply, and
the switch learns one server’s actual MAC address (Figure 25-4); the virtual MAC address is never
learned.
MAC: A:B
A:B:C:D
IP: 1.1.1.1
fnC0026m
p
X
Port 0/1
Port 0/5
Move MAC
address
Active Link
m
ac-address-table station-move refresh-arp
c
onfigured at time of NIC teaming