OmniSwitch OS6860/OS6900/OS10K Troubleshooting Guide Part No.032996-00 Rev.A
AOS Release 7.X and 8.X January 2015
Alcatel-Lucent Page 54 of 148
Stateful Autoconfiguration
In the stateful address auto-configuration model, hosts obtain interface addresses and/or configuration information
and parameters from a server. The stateful approach is used when a site requires tighter control over exact address
assignments. Stateful Address Autoconfiguration is used to configure non-link-local addresses through the use of a
configuration protocol such as DHCP.
As far as the IPv6 host is concerned, using stateful DHCPv6 is little different to using stateless
DHCPv6 as the observed request/response times should be the same in most cases. However, it is possible that the
extra overhead of reading and writing state to memory inside the DHCPv6 server may lead to a small increase in
latency when compared to its stateless equivalent. This may be important for the configuration time of mobile nodes,
which must perform address configuration when moving into a new network.
Delegating a prefix to an entire site is commonly a stateful operation, as the service provider routing scheme must
always know where a site topologically resides, a packet targeted to a site must be routed back to the site. DHCPv6
server typically stores the DHCPv6 delegated prefix.
Example of Stateful Autoconfiguration
Network Diagram
Configuration Files of DHCPv6 Server
/flash/switch/ dhcpdv6.conf
v6-server-identifier dhcpv6;
duid-pool {
00-01-00-01-19-c3-8e-31-00-24-81-18-5b-f8 <---DUID of DHCPv6 client
00-01-*
}
v6-subnet 2001:db7::/64 {
policy send-unicast-option-enabled false;
policy subnet-unavailable-threshold 90;
policy subnet-unavailable-descent-threshold 85;
policy minimum-requested-lifetime 800;
option renewal-time 600;
option rebinding-time 600;
option preferred-lifetime 600;
option valid-lifetime 600;
option dns-recursive-name-server 2001:db8::1;
v6-dynamic-dhcp range 2001:db7::2 2001:db7::ff
{
policy minimum-requested-lifetime 650;
policy rapid-commit-enabled true;
option dns-recursive-name-server 2001:db8::1;
option domain-search-list example.com;
}
}
/flash/switch/ dhcpdv6.pcy
;QIPOrgID=4
AbusiveClientMonitorPeriod=30
AbusiveClientWarningCount=30
AbusiveClientLockout=30
AddManualToGlobalDuidPool=1
AllowClientPacketsWithInvalidOptions=1
AllowUnencodedFqdn=1
ClientFqdnOptionSupport=client
DefaultLease=6000
DHCPv6SocketAddr=2001:db8::1
RegisteredClientOnly=0
ReplyToUnmanagedInformationRequests=1
SendRequestedParamsOnly=1
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