Here we are trying to assign IPv6 address using SLAAC and send DNS v6 server info using DHCPv6.
For this we have to confogure a IPv6 local pool in ISG as show below:
ipv6 local pool RED 6868::/48 64
First, configure the ISG as DHCPv6 server by defining a IPv6 pool
ASR-2#show run | s POOL14
ipv6 dhcp pool POOL14
dns-server 1818::1818
##################################################
Now add the below commands to the access interface config:
ASR-2#show run int g1/2/1.200
Building configuration...
Current configuration : 279 bytes
!
interface GigabitEthernet1/2/1.200
encapsulation dot1Q 200
ip unnumbered Loopback66
ipv6 enable
ipv6 nd other-config-flag <<<<<<<<<
ipv6 dhcp server POOL14 <<<<<<<<<<
service-policy type control START_MAC
ip subscriber l2-connected
initiator unclassified mac-address
initiator dhcp
end
ASR-2#
ASR-2#
ASR-2#
Enable below debugs:
ASR-2#debug ipv6 dhcp detail
IPv6 DHCP debugging is on (detailed)
ASR-2#
ASR-2#
ASR-2#
ASR-2#config t
Enter configuration commands, one per line. End with CNTL/Z.
ASR-2(config)#logg conso
ASR-2(config)#^Z
ASR-2#
ASR-2#
ASR-2#
ASR-2#sss
%No active Subscriber Sessions
ASR-2#
*Aug 22 08:58:21.455 IST: %SYS-5-CONFIG_I: Configured from console by console
*Aug 22 08:58:37.406 IST: IPv6 DHCP: Received INFORMATION-REQUEST from FE80::201:11FF:FE11:2222 on GigabitEthernet1/2/2.500
*Aug 22 08:58:37.406 IST: IPv6 DHCP: detailed packet contents
*Aug 22 08:58:37.406 IST: src FE80::201:11FF:FE11:2222 (GigabitEthernet1/2/2.500)
*Aug 22 08:58:37.406 IST: dst FF02::1:2
*Aug 22 08:58:37.406 IST: type INFORMATION-REQUEST(11), xid 7260385
*Aug 22 08:58:37.406 IST: option ELAPSED-TIME(8), len 2
*Aug 22 08:58:37.406 IST: elapsed-time 0
*Aug 22 08:58:37.406 IST: option CLIENTID(1), len 10
*Aug 22 08:58:37.406 IST: 00030001442B035DFF80
*Aug 22 08:58:37.406 IST: option ORO(6), len 6
*Aug 22 08:58:37.406 IST: DNS-SERVERS,DOMAIN-LIST,UNKNOWN
*Aug 22 08:58:37.406 IST: IPv6 DHCP: Using interface pool POOL14
*Aug 22 08:58:37.406 IST: IPv6 DHCP_AAA: Retrieved subblock; It has AAA DNS_SERVERS=0
*Aug 22 08:58:37.406 IST: IPv6 DHCP: Source Address from SAS FE80::227:DFF:FE4E:D562
*Aug 22 08:58:37.406 IST: IPv6 DHCP: detailed packet contents
*Aug 22 08:58:37.406 IST: src FE80::227:DFF:FE4E:D562
*Aug 22 08:58:37.406 IST: dst FE80::201:11FF:FE11:2222 (GigabitEthernet1/2/2.500)
*Aug 22 08:58:37.406 IST: type REPLY(7), xid 7260385
*Aug 22 08:58:37.406 IST: option SERVERID(2), len 10
*Aug 22 08:58:37.406 IST: 0003000100270D4ED500
*Aug 22 08:58:37.406 IST: option CLIENTID(1), len 10
*Aug 22 08:58:37.406 IST: 00030001442B035DFF80
*Aug 22 08:58:37.406 IST: option DNS-SERVERS(23), len 16
*Aug 22 08:58:37.406 IST: 1818::1818
*Aug 22 08:58:37.406 IST: IPv6 DHCP: Sending REPLY to FE80::201:11FF:FE11:2222 on GigabitEthernet1/2/2.500
ASR-2#
####################################################################################
Enable below debug in client:
client#debug ipv6 dhcp detail
IPv6 DHCP debugging is on (detailed)
client#
client#
client#config t
Enter configuration commands, one per line. End with CNTL/Z.
client(config)#int g0/2.500
client(config-subif)#shut
*Aug 22 15:55:55.767: IPv6 DHCP: Stopping client stateless autoconfig
*Aug 22 15:55:55.767: IPv6 DHCP: Unconfiguring DNS server 1818::1818
client(config-subif)#
client(config-subif)#
client(config-subif)#
client(config-subif)#no shut
client(config-subif)#
*Aug 22 15:56:05.379: DEBUG_SWITCH:ARP 64.64.64.3 64.64.64.1
*Aug 22 15:56:05.379: DEBUG_SWITCH:OFP Roaming 64.64.64.1 observed
*Aug 22 15:56:07.383: IPv6 DHCP: Sending INFORMATION-REQUEST to FF02::1:2 on GigabitEthernet0/2.500
*Aug 22 15:56:07.383: IPv6 DHCP: detailed packet contents
*Aug 22 15:56:07.383: src FE80::201:11FF:FE11:2222
*Aug 22 15:56:07.383: dst FF02::1:2 (GigabitEthernet0/2.500)
*Aug 22 15:56:07.383: type INFORMATION-REQUEST(11), xid 7387384
*Aug 22 15:56:07.383: option ELAPSED-TIME(8), len 2
*Aug 22 15:56:07.383: elapsed-time 0
*Aug 22 15:56:07.383: option CLIENTID(1), len 10
*Aug 22 15:56:07.383: 00030001442B035DFF80
*Aug 22 15:56:07.383: option ORO(6), len 6
*Aug 22 15:56:07.383: DNS-SERVERS,DOMAIN-LIST,INFO-REFRESH
*Aug 22 15:56:07.383: IPv6 DHCP: DHCPv6 changes state from IDLE to
INFORMATION-REQUEST (STATELESS) on GigabitEthernet0/2.500
*Aug 22 15:56:07.385: IPv6 DHCP: Received REPLY from FE80::227:DFF:FE4E:D562 on GigabitEthernet0/2.500
*Aug 22 15:56:07.385: IPv6 DHCP: detailed packet contents
*Aug 22 15:56:07.385: src FE80::227:DFF:FE4E:D562 (GigabitEthernet0/2.500)
*Aug 22 15:56:07.385: dst FE80::201:11FF:FE11:2222 (GigabitEthernet0/2.500)
*Aug 22 15:56:07.385: type REPLY(7), xid 7387384
*Aug 22 15:56:07.385: option SERVERID(2), len 10
*Aug 22 15:56:07.385: 0003000100270D4ED500
*Aug 22 15:56:07.385: option CLIENTID(1), len 10
*Aug 22 15:56:07.385: 00030001442B035DFF80
*Aug 22 15:56:07.385: option DNS-SERVERS(23), len 16
*Aug 22 15:56:07.385: 1818::1818
*Aug 22 15:56:07.385: IPv6 DHCP: Adding server FE80::227:DFF:FE4E:D562
*Aug 22 15:56:07.385: IPv6 DHCP: Processing options
* Aug 22 15:56:07.385: IPv6 DHCP: Configuring DNS server 1818::1818 <<<<<<<<<<
*Aug 22 15:56:07.385: IPv6 DHCP: DHCPv6 changes state from
INFORMATION-REQUEST to IDLE (REPLY_RECEIVED) on GigabitEthernet0/2.500
client(config-subif)#
client(config-subif)#
client(config-subif)#
*Aug 22 15:56:10.385: DEBUG_SWITCH:ARP 64.64.64.3 64.64.64.1
*Aug 22 15:56:10.385: DEBUG_SWITCH:OFP Roaming 64.64.64.1 observed
*Aug 22 15:56:11.427: %DHCP-6-ADDRESS_ASSIGN: Interface
GigabitEthernet0/2.500 assigned DHCP address 64.64.64.3, mask
255.255.255.0, hostname client
client(config-subif)#
client(config-subif)#
Use the below command to view the DNS info received:
client#show ipv6 dhcp interface g0/2.500
GigabitEthernet0/2.500 is in client mode
Prefix State is IDLE (0)
Information refresh timer expires in 23:53:18
Address State is IDLE
List of known servers:
Reachable via address: FE80::227:DFF:FE4E:D562
DUID: 0003000100270D4ED500
Preference: 0
Configuration parameters:
DNS server: 1818::1818 <<<<<<<<<<<<<<<<<<
Information refresh time: 0
Prefix Rapid-Commit: disabled
Address Rapid-Commit: disabled
client#
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