HP 5500 Ei 5500 Si Switch Series Configuration Guide

 159 
    SOLICIT                   :  0 
    REQUEST                   :  0 
    CONFIRM                   :  0 
    RENEW                     :  0 
    REBIND                    :  0 
    RELEASE                   :  0 
    DECLINE                   :  0 
    INFORMATION-REQUEST       :  7 
    RELAY-FORWARD             :  0 
    RELAY-REPLY               :  7 
Packets sent                  :  14 
    ADVERTISE                 :  0 
    RECONFIGURE               :  0 
    REPLY                     :  7...

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Configuring DHCPv6 client 
Overview 
Serving as a DHCPv6 client, the device only supports stateless DHCPv6 configuration, that is, the device 
can only obtain other network configuration parameters, except the IPv6 address and prefix from the 
DHCPv6 server. 
With an IPv6 address obtained through stateless address autoconfiguration, the device automatically 
enables the stateless DHCPv6 function after it receives an RA message with the M flag set to 0 and the 
O flag set to 1. 
Configuring the...

 161 
Step Command Remarks 
2.  Set the DSCP value for the DHCPv6 
packets sent by the DHCPv6 client.  ipv6 dhcp client dscp 
dscp-value
  Optional. 
By default, the DSCP value in 
DHCPv6 packets is 56. 
 
Displaying and maintaining the DHCPv6 client 
 
Task Command Remarks 
Display DHCPv6 client 
information. 
display ipv6 dhcp client 
[ interface  interface-type 
interface-number  ] [ | { begin  | exclude | include } 
regular-expression  ]  Available in any view 
Display DHCPv6 client 
statistics....

 162 
[SwitchB] interface vlan-interface 2 
[SwitchB-Vlan-interface2] ipv6 address 1::1 64 
# Set the O flag in the RA messages to 1. 
[SwitchB-Vlan-interface2] ipv6 nd autoconfig other-flag 
# Enable Switch B to send RA messages. 
[SwitchB-Vlan-interface2] undo ipv6 nd ra halt 
2. Configure Switch A: 
# Enable the IPv6 packet forwarding function. 
 system-view 
[SwitchA] ipv6 
# Enable stateless IPv6 address autoconfiguration on VLAN-interface 2. 
[SwitchA] interface vlan-interface 2...

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        Rebind                :  0 
        Information-request   :  5 
        Release               :  0 
        Decline               :  0  

 164 
Configuring DHCPv6 snooping 
A  D H C P v 6  s n o o p i n g  d evic e  d o e s  n o t  wo rk  i f  i t  i s  between a DHCPv6 relay agent and a DHCPv6 server. 
The DHCPv6 snooping device works when it is between a DHCPv6 client and a DHCPv6 relay agent or 
between a DHCPv6 client and a DHCPv6 server. 
You can configure only Layer 2 Ethernet ports or  Layer 2 aggregate interfaces as DHCPv6 snooping 
trusted ports. For more informatio n about aggregate interfaces, see  Layer 2—LAN Switching...

 165 
that they do not forward reply messages from any DHCPv6 servers. This ensures that the DHCPv6 client 
can obtain an IPv6 address from the authorized DHCPv6 server only.  
As shown in Figure 71, c
onfigure the port that connects to the DHCPv6 server as a trusted port, and other 
ports as untrusted.  
Recording IP-to-MAC mappings of DHCPv6 clients 
DHCPv6 snooping reads DHCPv6 messages to create and update DHCPv6 snoopi ng entries, including 
MAC addresses of clients, IPv6 addresses obtained by the...

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Step Command Remarks 
2.  Enter interface view.  interface 
interface-type 
interface-number   N/A 
3.
  Configure the port as trusted. 
ipv6 dhcp snooping trust  By default, all ports of the device 
with DHCPv6 snooping globally 
enabled are untrusted. 
 
Configuring the maximum number of DHCPv6 
snooping entries an interface can learn 
Perform this optional task to prevent an interface 
from learning too many DHCPv6 snooping entries and 
to save system resources. 
To configure the maximum number...

 167 
Figure 72 Network diagram 
 
 
Configuration procedure 
# Enable DHCPv6 snooping globally. 
 system-view 
[Switch] ipv6 dhcp snooping enable 
# Add GigabitEthernet 1/0/1, GigabitEthernet 1/0/2, and GigabitEthernet 1/0/3 to VLAN 2. 
[Switch] vlan 2 
[Switch-vlan2] port GigabitEthernet 1/0/1 GigabitEthernet 1/0/2 GigabitE\
thernet 1/0/3 
# Enable DHCPv6 snooping for VLAN 2. 
[Switch-vlan2] ipv6 dhcp snooping vlan enable 
[Switch] quit 
# Configure GigabitEthernet 1/0/1 as a DHCPv6 snooping trusted...

 168 
Configuring IPv6 DNS 
Overview 
IPv6 Domain Name System (DNS) is responsible for translating domain names into IPv6 addresses. Like 
I P v 4  D NS,  I P v 6  D NS  i ncl u de s  s ta t ic  d o m ai n  n a m e   resolution and dynamic domain name resolution. The 
functions and implementations of the two types of doma in name resolution are the same as those of IPv4 
DNS. For more information, see Configuring IPv4 DNS. 
Configuring the IPv6 DNS client 
Configuring static domain name resolution...