HP 5500 Ei 5500 Si Switch Series Configuration Guide

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•  Add GigabitEthernet 1/0/2 and GigabitEthernet 1/0/3 into VLAN 1, and specify IP address 
16 .1.1. 3 0 / 2 4  f o r  V L A N - i n t e r f a c e  1.   
•   Add GigabitEthernet 1/0/1 and GigabitEthernet 1/0/4 into VLAN 2, and specify IP address 
17.1.1.1 / 2 4  f o r  V L A N - i n t e r f a c e  2 .   
•   S p e c i f y  17.1.1.1 / 2 4  a s  t h e  d e f a u l t  g a t e w a y  o f  H o s t  A  a n d  H o s t  B .   
•   Specify 16.1.1.30/24 as the default gateway of Server A and Server B. 
•...

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Verifying the configuration 
•  NLB load sharing —Enables the FTP server function of Server A and Server B. Host A and Host B 
send requests to the virtual IP address and each  of them logs in to a different server.  
•   NLB redundancy —Disables the network interface card of Server A. Host A and Host B send 
requests to the virtual IP address and both log in to the FTP server on Server B. 
  

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Configuring gratuitous ARP 
Overview 
In a gratuitous ARP packet, the sender IP address and the target IP address are the IP address of the 
sending device. 
A device sends a gratuitous ARP packet for either of the following purposes: 
•  Determine whether its IP address is already used by another device. If the IP address is already used, 
the device is informed of the conflict by an ARP reply. 
•   Inform other devices of a change of its MAC address. 
Gratuitous ARP packet learning 
This feature...

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If the virtual IP address of the VRRP group is associated with a virtual MAC address, the sender 
MAC address in the gratuitous ARP packet takes the  virtual MAC address of the virtual router. If the 
virtual IP address of the VRRP group is associated  with the real MAC address of an interface, the 
sender MAC address in the gratuitous ARP packet takes the MAC address of the interface on the 
master router in the VRRP group. 
For more information about VRRP, see  High Availability Configuration...

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Configuring proxy ARP 
Overview 
Proxy ARP enables a device on a network to answer ARP requests for an IP address not on that network. 
With proxy ARP, hosts on different broadcast domains can communicate with each other as they do on 
the same network.  
Proxy ARP includes common proxy ARP and local proxy ARP. 
•   Common proxy ARP —Allows communication between hosts  that connect to different Layer-3 
interfaces and reside in different broadcast domains.  
•   Local proxy ARP —Allows communication...

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Figure 7 Application environment of local proxy ARP 
 
 
Enable local proxy ARP in one of the following cases: 
•  Hosts connecting to different isolated Layer 2 ports in the same VLAN need to communicate at 
Layer 3. 
•   If a super VLAN is configured, hosts in different sub VLANs of the super VLAN need to communicate 
at Layer 3. 
•   If an isolate-user-VLAN is configured, hosts in  different secondary VLANs of the isolate-user-VLAN 
need to communicate at Layer 3. 
Enabling common proxy ARP 
To...

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Displaying and maintaining proxy ARP 
 
Task Command  Remarks 
Display whether proxy ARP is 
enabled. display proxy-arp [
 interface interface-type 
interface-number ] [ |  { begin | exclude  | 
include  } regular-expression ]  Available in any view 
Display whether local proxy ARP is 
enabled. display local-proxy-arp 
[ interface 
interface-type interface-number  ] [ | { begin  
|  exclude  | include  } regular-expression ]  Available in any view
 
 
Proxy ARP configuration examples 
Common proxy...

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# Specify the IP address of interface VLAN-interface 1. 
[Switch] interface vlan-interface 1 
[Switch-Vlan-interface1] ip address 192.168.10.99 255.255.255.0 
# Enable proxy ARP on interface VLAN-interface 1. 
[Switch-Vlan-interface1] proxy-arp enable 
[Switch-Vlan-interface1] quit 
# Specify the IP address of interface VLAN-interface 2. 
[Switch] interface vlan-interface 2 
[Switch-Vlan-interface2] ip address 192.168.20.99 255.255.255.0 
# Enable proxy ARP on interface VLAN-interface 2....

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[SwitchB-vlan2] port GigabitEthernet 1/0/1 
[SwitchB-vlan2] port GigabitEthernet 1/0/2 
[SwitchB-vlan2] quit 
[SwitchB] interface GigabitEthernet 1/0/3 
[SwitchB-GigabitEthernet1/0/3] port-isolate enable 
[SwitchB-GigabitEthernet1/0/3] quit 
[SwitchB] interface GigabitEthernet 1/0/1 
[SwitchB-GigabitEthernet1/0/1] port-isolate enable 
[SwitchB-GigabitEthernet1/0/1] quit 
2. Configure Switch A: 
# Create VLAN 2, and add GigabitEthernet 1/0/2 to VLAN 2.  
 system-view 
[SwitchA] vlan 2...

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Configuration procedure 
# Create the super VLAN and the sub-VLANs. Add GigabitEthernet 1/0/2 to VLAN 2 and 
GigabitEthernet 1/0/1 to VLAN 3. Configure the IP address 192.168.10.100/16 for the interface of 
VLAN 10.  
 system-view 
[Switch] vlan 2 
[Switch-vlan2] port GigabitEthernet 1/0/2 
[Switch-vlan2] quit 
[Switch] vlan 3 
[Switch-vlan3] port GigabitEthernet 1/0/1 
[Switch-vlan3] quit 
[Switch] vlan 10 
[Switch-vlan10] supervlan 
[Switch-vlan10] subvlan 2 3 
[Switch-vlan10] quit 
[Switch]...