11-08-2017 03:41 AM - edited 03-01-2019 05:54 PM
Hello
Any suggestions as to what I might do wrong? I have some switches with multiple L3 VLANs with IPv6 enabled (SLAAC). Everything is working, however, when I look at my IPv6 dhcp bindings, I get A LOT of clients (duplicates). It is essentially creating a sort of "memory leak"
configuration
ipv6 unicast-routing ipv6 dhcp pool v6-pool dns-server xxxx:xxx:3AC::8888 dns-server xxxx:xxx:3AC::8844 domain-name domain.com ! interface FastEthernet0/40 switchport access vlan 140 switchport mode access no logging event link-status no snmp trap link-status no mdix auto spanning-tree portfast ! interface Vlan140 ip address 10.184.140.1 255.255.255.0 ip access-group DEFAULT-IN in ipv6 address xxxx:xxx:3AC:140::1/64 ipv6 nd autoconfig prefix ipv6 nd other-config-flag ipv6 dhcp server v6-pool ipv6 traffic-filter v6-in in
show commands
sw1#sh ipv6 dhcp pool DHCPv6 pool: v6-pool DNS server: xxxx:xxx:3AC::8888 DNS server: xxxx:xxx:3AC::8844 Domain name: domain.com Active clients: 336751 <---- note there should be maybe max. 500 clients sw1#sh ipv6 dhcp bind FE80::52C7:BFFF:FE76:52D7 Client: FE80::52C7:BFFF:FE76:52D7 (Vlan140) DUID: 000100012195A6F550C7BF7652D7 IA NA: IA ID 0x00022D70, T1 0, T2 0 Client: FE80::52C7:BFFF:FE76:52D7 (Vlan140) DUID: 000100012195A4F450C7BF7652D7 IA NA: IA ID 0x00022B6F, T1 0, T2 0 Client: FE80::52C7:BFFF:FE76:52D7 (Vlan140) DUID: 000100012195A8F650C7BF7652D7 IA NA: IA ID 0x00022F71, T1 0, T2 0 Client: FE80::52C7:BFFF:FE76:52D7 (Vlan140) DUID: 000100012195A2F350C7BF7652D7 IA NA: IA ID 0x0002296E, T1 0, T2 0 Client: FE80::52C7:BFFF:FE76:52D7 (Vlan140) DUID: 000100012195A0F250C7BF7652D7 IA NA: IA ID 0x0002276D, T1 0, T2 0 Client: FE80::52C7:BFFF:FE76:52D7 (Vlan140) DUID: 000100012195A7E450C7BF7652D7 IA NA: IA ID 0x00022E5F, T1 0, T2 0 Client: FE80::52C7:BFFF:FE76:52D7 (Vlan140) .....<some clients have A LOT of entries>
Thank you in advance :o)
11-10-2017 03:58 AM
Forgot to mention the platform: WS-C3560-48TS Version 15.0(2)SE11. I have tried different versions without any luck. Anyone have any ideas as to what is wrong?
11-11-2017 03:48 PM
Hi, i haven't encountered this issue before but if you may, please post the output of the following command:
show ipv6 dhcp binding
I know that will probably be a lot of output but just send the details relating to one entry.
I am throwing spaghetti at the wall here but i think your issue is related to the preferred lifetime values causing the IA NA to change each time a PC boots up or reconnects to the network and thus the DCHP server thinks its a new request and sends out DNS info again... but let me not speculate, send the output and lets take it from there
11-13-2017 01:38 AM
Hello.
Thank you for your reply. You are right, a sh ipv6 dhcp bindings would be massive. As of now, I have 62301 "active" clients.
sw1#sh ipv6 dhcp pool DHCPv6 pool: v6-pool DNS server: xxxx:xxx:3AC::8888 DNS server: xxxx:xxx:3AC::8844 Domain name: domain.com Active clients: 62301
...of course this is wrong and is due to multiple duplicate entries.
I can give you a complete output of a single host, but that would also be massive. I've copied some of the output for a single host (all in all it went on for 36000 lines for this output - in other words this host alone takes about 12000 entries). There are a lot of clients who have between 8000-14000 entries each.
sw1#sh ipv6 dhcp binding FE80::8616:F9FF:FEE4:D203 Client: FE80::8616:F9FF:FEE4:D203 (Vlan178) DUID: 000100012195D36A8416F9E4D203 IA NA: IA ID 0x0034E025, T1 0, T2 0 Client: FE80::8616:F9FF:FEE4:D203 (Vlan178) DUID: 000100012195D86A8416F9E4D203 IA NA: IA ID 0x0034E526, T1 0, T2 0 Client: FE80::8616:F9FF:FEE4:D203 (Vlan178) DUID: 00010001219668698416F9E4D203 IA NA: IA ID 0x00357524, T1 0, T2 0 Client: FE80::8616:F9FF:FEE4:D203 (Vlan178) DUID: 0001000121966D698416F9E4D203 IA NA: IA ID 0x00357A25, T1 0, T2 0 Client: FE80::8616:F9FF:FEE4:D203 (Vlan178) DUID: 00010001219672698416F9E4D203 IA NA: IA ID 0x00357F25, T1 0, T2 0 Client: FE80::8616:F9FF:FEE4:D203 (Vlan178) DUID: 000100012196C5698416F9E4D203 IA NA: IA ID 0x0035D224, T1 0, T2 0 ...... Client: FE80::8616:F9FF:FEE4:D203 (Vlan178) DUID: 00010001219B949B8416F9E4D203 IA NA: IA ID 0x003AA157, T1 0, T2 0 Client: FE80::8616:F9FF:FEE4:D203 (Vlan178) DUID: 00010001219B999B8416F9E4D203 IA NA: IA ID 0x003AA657, T1 0, T2 0 Client: FE80::8616:F9FF:FEE4:D203 (Vlan178) DUID: 00010001219BF19B8416F9E4D203 IA NA: IA ID 0x003AFE56, T1 0, T2 0 Client: FE80::8616:F9FF:FEE4:D203 (Vlan178) DUID: 00010001219BF69B8416F9E4D203 IA NA: IA ID 0x003B0357, T1 0, T2 0 Client: FE80::8616:F9FF:FEE4:D203 (Vlan178) DUID: 00010001219BFB9B8416F9E4D203 IA NA: IA ID 0x003B0857, T1 0, T2 0 Client: FE80::8616:F9FF:FEE4:D203 (Vlan178) DUID: 00010001219C009C8416F9E4D203 IA NA: IA ID 0x003B0D57, T1 0, T2 0 Client: FE80::8616:F9FF:FEE4:D203 (Vlan178) DUID: 00010001219C1C9C8416F9E4D203 IA NA: IA ID 0x003B2957, T1 0, T2 0 Client: FE80::8616:F9FF:FEE4:D203 (Vlan178) DUID: 00010001219C219C8416F9E4D203 IA NA: IA ID 0x003B2E58, T1 0, T2 0
As I've said before, I have tried different IOS versions (both 12.2, 12.3 and 15.x train), but with the same result. So any help would be appreciated :o)
03-06-2018 05:20 AM
Hi @jni
I am facing the exact same issue.
Did you ever find a solution for this?
Best regards, Jacob
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