HP 5500 Ei 5500 Si Switch Series Configuration Guide

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 1 
Configuring ARP 
Only HP 5500 EI switches support Layer 3 Ethernet port configuration. 
You can use the port link-mode  command to set an Ethernet port to operate in bridge (Layer 2) or route 
mode (Layer 3) (see  Layer 2—LAN Switching Configuration Guide ). 
Overview 
The Address Resolution Protocol (ARP) is used to re solve an IP address into a physical address (Ethernet 
MAC address, for example). 
In an Ethernet LAN, a device uses ARP to resolve the IP address of the next hop to the corresponding...

 2 
ARP operation 
If Host A and Host B are on the same subnet and Host A sends a packet to Host B, as shown in  Figure 
2 , the r
esolution process is: 
1.  Host A looks in its ARP table to see whether there is an ARP entry for Host B. If yes, Host A uses the 
MAC address in the entry to encapsulate the IP pa cket into a data link layer frame and sends the 
frame to Host B. 
2.  If Host A finds no entry for Host B, Host A buff ers the packet and broadcasts an ARP request using 
the following...

 3 
ARP table 
An ARP table stores dynamic and static ARP entries. 
Dynamic ARP entry 
ARP automatically creates and updates dynamic entries. A dynamic ARP entry is removed when its aging 
timer expires or the output interface goes down, an d it can be overwritten by a static ARP entry. 
Static ARP entry 
A static ARP entry is manually configured and maintain ed. It does not age out, and cannot be overwritten 
by a dynamic ARP entry.  
Static ARP entries protect communication between de vices, because...

 4 
Step Command  Remarks 
2.  Configure a static ARP 
entry. 
• Configure a long static ARP entry:  
arp static  ip-address mac-address vlan-id 
interface-type interface-number  [ vpn-instance 
vpn-instance-name  ] 
• Configure a short static ARP entry:  
arp static  ip-address mac-address  [ vpn-instance 
vpn-instance-name  ]  Use either command. 
 
Only HP 5500 EI 
Switch Series supports 
the 
vpn-instance  
vpn-instance-name  
option 
 
Configuring the maximum number of dynamic ARP 
entries for an...

 5 
Step Command Remarks 
2.  Set the age timer for dynamic 
ARP entries.  arp timer aging 
aging-time  Optional. 
20 minutes by default. 
 
Enabling dynamic ARP entry check 
The dynamic ARP entry check function controls whether the device supports dynamic ARP entries with 
multicast MAC addresses. 
When dynamic ARP entry check is enabled, the devi
ce cannot learn dynamic ARP entries containing 
multicast MAC addresses.  
When dynamic ARP entry check is disabled, the device can learn dynamic ARP entries...

 6 
 
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 bala
ncing technology for server clustering developed 
on Windows Server.  
NLB supports load sharing and redundancy among servers within a cluster. To implement fast failover, 
NLB requires that the switch forwards network traffic to  all servers or...

 7 
 CAUTION: 
•
  Clearing ARP entries from the ARP table may cause communication failures. 
•   The verbose keyword is available only on the HP 5500 EI Switch Series. 
 
Task Command  Remarks 
Display ARP entries in the ARP 
table.  display arp [ [ 
all |  dynamic  | static  ] [ slot 
slot-number  ] | vlan  vlan-id  | interface  
interface-type interface-number  ] [ count | 
verbose  ] [ | { begin |  exclude |  include } 
regular-expression  ]   Available in any view 
Display the ARP entry for a...

 8 
Figure 4 Network diagram 
 
 
Configuration procedure 
Configure the switch: 
# Create VLAN 10. 
 system-view 
[Switch] vlan 10 
[Switch-vlan10] quit 
# Add interface GigabitEthernet 1/0/1 to VLAN 10. 
[Switch] interface GigabitEthernet 1/0/1 
[Switch-GigabitEthernet1/0/1] port link-type trunk 
[Switch-GigabitEthernet1/0/1] port trunk permit vlan 10 
[Switch-GigabitEthernet1/0/1] quit 
# Create interface VLAN-interface 10 and configure its IP address. 
[Switch] interface vlan-interface 10...