HP 5500 Ei 5500 Si Switch Series Configuration Guide

 119 
Figure 55 Path MTU discovery process 
 
 
1. The source host compares its MTU with the packet  to be sent, performs necessary fragmentation, 
and sends the resulting packet to the destination host. 
2.  If the MTU supported by a forwarding interface is  smaller than the packet, the device discards the 
packet and returns an ICMPv6 error packet contai ning the interface MTU to the source host. 
3. After receiving the ICMPv6 error packet, the source host uses the returned MTU to limit the packet...

 120 
•  RFC 2460,  Internet Protocol, Version 6 (IPv6) Specification  
•   RFC 2461,  Neighbor Discovery for IP Version 6 (IPv6)  
•   RFC 2462,  IPv6 Stateless Address Autoconfiguration  
•   RFC 2463,  Internet Control Message Protocol (ICMPv6) for the Internet Protocol Version 6 (IPv6) 
Specification  
•   RFC 2464,  Transmission of IPv6 Packets over Ethernet Networks  
•   RFC 2526,  Reserved IPv6 Subnet Anycast Addresses  
•   RFC 2894,  Router Renumbering for IPv6  
•   RFC 3307,  Allocation...

 121 
Configuring basic IPv6 functions 
Enabling IPv6 
Enable IPv6 before you perform any IPv6-related configuration. Without IPv6 enabled, an interface 
cannot forward IPv6 packets even if it has an IPv6 address configured. 
To enable IPv6: 
 
Step Command Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Enable IPv6. 
ipv6  Disabled by default 
 
Configuring an IPv6 global unicast address 
Configure an IPv6 global unicast address by using the following options: 
•  EUI-64 IPv6 addressing—The IPv6...

 122 
Step Command Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Enter interface view.  interface
 interface-type  
interface-number  N/A 
3.
  Configure an IPv6 address 
manually.  ipv6 address
 { ipv6-address 
prefix-length | 
ipv6-address /prefix-length  }  By default, no IPv6 global unicast 
address is configured on an interface.
 
 
Stateless address autoconfiguration 
To configure an interface to generate an IPv6 address by using stateless address autoconfiguration:  
Step Command Remarks...

 123 
{ The preferred lifetime configured for temporary IPv6 addresses minus DESYNC_FACTOR 
(which is a random number ranging 0 to 600, in seconds). 
•   The valid lifetime of a temporary IPv6 address takes the value of the smaller of the following values: 
{  The valid lifetime of the address prefix. 
{ The valid lifetime configured for temporary IPv6 addresses. 
To configure the temporary address function: 
 
Step Command Remarks 
1.   Enter system view. 
system-view N/A 
2.  Configure the system to...

 124 
Step Command Remarks 
3.  Configure the interface to 
automatically generate an 
IPv6 link-local address.  ipv6 address auto link-local  Optional. 
By default, no link-local address is 
configured on an interface. 
After an IPv6 global unicast address is 
configured on the interface, a link-local 
address is generated automatically. 
 
To configure an IPv6 link-local address manually:  
Step Command Remarks 
1.
  Enter system view. 
system-view  N/A 
2.  Enter interface view.  interface...

 125 
 
Configuring IPv6 ND 
Configuring a static neighbor entry 
The IPv6 address of a neighboring node can be resolved into a link-layer address dynamically through 
NS and NA messages or through a manually configured static neighbor entry. 
The device uniquely identifies a static neighbor entry by the neighbors IPv6 address and the local Layer 
3 interface number. You can configure a static neighbor entry by using either of the following methods: 
•   Method 1 —Associate a neighbor IPv6 address and...

 126 
Step Command Remarks 
2.  Enter interface view.  interface 
interface-type 
interface-number   N/A 
3.
  Configure the maximum 
number of neighbors 
dynamically learned by an 
interface.  ipv6 neighbors max-learning-num
 
number  Optional. 
By default, a Layer 2 interface does 
not limit the number of neighbors 
dynamically learned. A Layer 3 
interface can learn up to 1024 
neighbors dynamically for HP 
5500 SI Switch Series, and up to 
4096 neighbors dynamically for 
HP 5500 EI Switch Series....

 127 
Parameters Description 
MTU Make sure that all nodes on a link use the same MTU value. 
M flag  Determines whether hosts use the stateful autoconfiguration to acquire IPv6 
addresses. 
If the M flag is set to 1, hosts use the stateful autoconfiguration (for example, through 
a DHCP server) to acquire IPv6 addresse
s. Otherwise, hosts use the stateless 
autoconfiguration to acquire IPv6 addresses and generate IPv6 addresses 
according to their own link-layer addresses and the obtained prefix...

 128 
Step Command Remarks 
3.  Enter interface view.  interface 
interface-type 
interface-number  N/A 
4.
  Configure the prefix 
information in RA 
messages.  ipv6 nd ra prefix
 { ipv6-prefix 
prefix-length |  
ipv6-prefix /prefix-length } 
valid-lifetime preferred-lifetime 
[ no-autoconfig  | off-link  ] *  Optional. 
By default, no prefix information is 
configured for RA messages, and the 
IPv6 address of the interface sending RA 
messages is used as the prefix 
information with valid lifetime...