HP 5500 Ei 5500 Si Switch Series Configuration Guide

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Figure 11 Network diagram 
 
 
Configuration procedure 
1. Configure Switch B: 
# Create VLAN 2, VLAN 3, and VLAN 5 on Swit ch B. Add GigabitEthernet 1/0/3 to VLAN 2, 
GigabitEthernet 1/0/1 to VLAN 3, and GigabitEthernet 1/0/2 to VLAN 5. Configure VLAN 5 as 
the isolate-user-VLAN, and VLAN 2 and VLAN  3 as secondary VLANs. Configure the mappings 
between isolate-user-VLAN  and the secondary VLANs. 
 system-view 
[SwitchB] vlan 2 
[SwitchB-vlan2] port GigabitEthernet 1/0/3 
[SwitchB-vlan2] quit...

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[SwtichA-vlan5] port GigabitEthernet 1/0/2 
[SwitchA-vlan5] quit 
[SwtichA] interface vlan-interface 5 
[SwtichA-Vlan-interface5] ip address 192.168.10.100 255.255.0.0 
F r o m  H o s t  A ,  p i n g  H o s t  B .  T h e  p i n g  o p e r a t i o n  i s  unsuccessful because they are isolated at Layer 2. 
# Configure local proxy ARP to implement Layer 3 communication between Host A and Host B. 
[SwtichA-Vlan-interface5] local-proxy-arp enable 
From Host A, ping Host B. The ping oper ation is...

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Configuring ARP snooping 
Overview 
The ARP snooping feature is used in Layer 2 switching networks. It creates ARP snooping entries using 
ARP packets. 
If ARP snooping is enabled on a VLAN of a device, ARP packets received by the interfaces of the VLAN 
are redirected to the CPU. The CPU uses ARP packets to create ARP snooping entries comprising source 
IP and MAC addresses, VLAN and receiving port information. 
The aging time and valid period of an ARP snooping entry are 25 minutes and 15 minutes,...

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Configuring IP addressing 
Only the HP 5500 EI switches support Layer 3 Ethernet port configuration. 
This chapter describes IP addressing basic and manual IP address assignment for interfaces. Dynamic IP 
address assignment (BOOTP and DHCP) are beyond the scope of this chapter. 
The term interface in this chapter refers to Layer 3 interfaces, including VLAN interfaces and 
route-mode (or Layer 3) Ethernet ports. You can set an Ethernet port to operate in route mode by using the 
port  link-mode...

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Class Address range Remarks 
B 128.0.0.0 to 
191.255.255.255 
N/A 
C 192.0.0.0 to 
223.255.255.255 
N/A 
D 224.0.0.0 to 
239.255.255.255 
Multicast addresses. 
E 240.0.0.0 to 
255.255.255.255  Reserved for future use except for the broadcast address 
255.255.255.255.  
 
Special IP addresses 
The following IP addresses are for special use and cannot be used as host IP addresses. 
•
  IP address with an all-zero net ID —Identifies a host on the local network. For example, IP address 
0.0.0.16...

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•  Without subnetting —65,534 hosts (216 – 2). (The two deducted addresses are the broadcast 
address, which has an all-one host ID, and the network address, which has an all-zero host ID.)  
•   With subnetting —Using the first 9 bits of the host-id for subnetting provides 512 (2
9) subnets. 
H owever,  o n ly 7  bi t s  re m a i n  ava i l ab l e  for  t h e  hos t  I D.  Th i s  a l l ows  126  (27 –  2 )  hos ts  i n  e a ch  s u b ne t,  
a  t o t a l  o f  6 4 , 512  h o s t s  ( 512  ×  12 6...

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•  Assign a primary IP address and a secondary IP address to VLAN-interface 1 on the switch.  
•   Set the primary IP address of VLAN-interface 1 as the gateway address of the hosts on subnet 
172.16.1.0/24, and the secondary IP address of VLAN-interface 1 as the gateway address of the 
hosts on subnet 172.16.2.0/24. 
Figure 14  Network diagram 
 
 
Configuration procedure 
# Assign a primary IP address and a secondary IP address to VLAN-interface 1.  
 system-view 
[Switch] interface vlan-interface...

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 ping 172.16.2.2 
  PING 172.16.2.2: 56  data bytes, press CTRL_C to break 
    Reply from 172.16.2.2: bytes=56 Sequence=1 ttl=255 time=25 ms 
    Reply from 172.16.2.2: bytes=56 Sequence=2 ttl=255 time=26 ms 
    Reply from 172.16.2.2: bytes=56 Sequence=3 ttl=255 time=26 ms 
    Reply from 172.16.2.2: bytes=56 Sequence=4 ttl=255 time=26 ms 
    Reply from 172.16.2.2: bytes=56 Sequence=5 ttl=255 time=26 ms 
 
  --- 172.16.2.2 ping statistics --- 
    5 packet(s) transmitted 
    5 packet(s) received...

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Configuration procedure 
To configure IP unnumbered on an interface:  
Step Command Remarks 
1.  Enter system view. 
system-view N/A 
2.  Enter tunnel interface view. 
interface tunnel number N/A 
3.  Specify the current interface to 
borrow the IP address of the 
specified interface.  ip address unnumbered
 interface  
interface-type interface-number   The interface does not borrow IP 
addresses from other interfaces by 
default. 
 
Displaying and maintaining IP addressing 
 
Task Command Remarks...

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DHCP overview 
The Dynamic Host Configuration Protocol (DHCP) provides a framework to assign configuration 
information to network devices.  
DHCP uses the client/server model. 
Figure 15 A typical DHCP application 
 
A DHCP client can obtain an IP address and other configuration parameters from a DHCP server on 
another subnet via a DHCP relay agent. For more information about the DHCP relay agent, see 
 Configuring DHCP relay agent . 
DHCP address allocation 
DHCP supports the following mechanisms...