HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 3 - IP Services Conf - Page 13

Configuring ARP quick update, Configuring multicast ARP

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When dynamic ARP entry check is disabled, the device can learn dynamic ARP entries containing multicast MAC addresses. To enable dynamic ARP entry check: Step Command 1. Enter system view. system-view 2. Enable dynamic ARP entry check. arp check enable Remarks N/A Optional. Enabled by default. Configuring ARP quick update HP recommends enabling ARP quick update in WLANs only. As shown in Figure 3, the laptop frequently roams between AP 1 and AP 2. This affects the mapping between its MAC address and output interface on the switch. If the switch does not update its ARP table immediately after the output interface changes, it may fail to communicate with the laptop. Figure 3 ARP quick update application scenario GE1/0/1 GE1/0/2 Switch AP1 AP2 Laptop With ARP quick update enabled, the switch updates the corresponding ARP entry immediately after the change of the mapping between a MAC address and an output interface to ensure nonstop data forwarding. To enable ARP quick update: Step 1. Enter system view. 2. Enable ARP quick update. Command system-view mac-address station-move quick-notify enable Remarks N/A Optional. Disabled by default. Configuring multicast ARP Microsoft Network Load Balancing (NLB) is a load balancing technology for server clustering developed on Windows Server. 5

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5
When dynamic ARP entry check is disabled, the device can learn dynamic ARP entries containing
multicast MAC addresses.
To enable dynamic ARP entry check:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enable dynamic ARP entry
check.
arp check enable
Optional.
Enabled by default.
Configuring ARP quick update
HP recommends enabling ARP quick update in WLANs only.
As shown in
Figure 3
, the laptop frequently roams between AP 1 and AP 2. This affects the mapping
between its MAC address and output interface on the switch. If the switch does not update its ARP table
immediately after the output interface changes, it may fail to communicate with the laptop.
Figure 3
ARP quick update application scenario
With ARP quick update enabled, the switch updates the corresponding ARP entry immediately after the
change of the mapping between a MAC address and an output interface to ensure nonstop data
forwarding.
To enable ARP quick update:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enable ARP quick
update.
mac-address station-move
quick-notify enable
Optional.
Disabled by default.
Configuring multicast ARP
Microsoft Network Load Balancing (NLB) is a load balancing technology for server clustering developed
on Windows Server.
GE1/0/1
GE1/0/2
Switch
AP1
AP2
Laptop