12-01-2021 09:57 PM - edited 12-01-2021 10:02 PM
Hello there,
I have a WS-C3560X-48T-L(15.2(4)E10-C3560E-UNIVERSALK9-M). I distribute IP to IP phones with this device. But I have a problem. It adds a self-excluded string when there is no string I excluded. I hope I could explain. I didn't add the "Excluded-13" seen below.
Output of "sh ip dhcp pool":
sh ip dhcp pool
Pool IP_TEL :
Utilization mark (high/low): 100 / 0
Subnet size (first/next): 0 / 0
Total addresses : 62
Leased addresses : 30
Excluded addresses : 13
Pending event: none
1 subnet is currently in the pool :
Current index IP address range Leased/Excluded/Total
10.82.8.212 10.82.8.193 - 10.82.8.254 30 / 13 / 62
and dhcp config:
ip dhcp pool IP_TEL
network 10.82.8.192 255.255.255.192
default-router 10.82.8.193
option 150 ip 10.221.56.4 10.221.56.134
lease 7
Thanks everyone in advance.
Solved! Go to Solution.
12-05-2021 02:55 PM - edited 12-05-2021 03:04 PM
Hello
What you are seeing is due to ip dhcp conflicts being enabled (by default) when the dhcp pool is created and activated
Before an ip allocation the server will send a ping for that ip and if it receives a rely it won’t allocate that ip but will reserve it so it isn’t used,
When you do a sh ip dhcp confllcit that listing shows how many reply’s the server has had from its ping checks and then has registered as conflict, this ip listing will removed from the pool of available addresses in the dhcp scope < (Excluded addresses :xx)
To negate this, you can:
12-01-2021 10:12 PM
sh run | inc ip dhcp excluded-address
12-01-2021 10:18 PM
the output of this command is empty. because I did not enter such a command.
12-01-2021 10:39 PM
sh ip dhcp conflict
12-01-2021 10:44 PM
sh ip dhcp conflict
IP address Detection method Detection time VRF
10.82.8.194 Ping Nov 30 2021 01:02 PM
10.82.8.195 Ping Nov 30 2021 01:02 PM
10.82.8.196 Ping Nov 30 2021 01:02 PM
10.82.8.197 Ping Nov 30 2021 01:02 PM
10.82.8.253 Ping Nov 30 2021 11:44 PM
10.82.8.200 Ping Nov 30 2021 11:44 PM
10.82.8.234 Ping Dec 01 2021 12:45 AM
10.82.8.233 Ping Dec 01 2021 12:45 AM
10.82.8.227 Ping Dec 01 2021 12:45 AM
10.82.8.239 Ping Dec 01 2021 12:45 AM
10.82.8.231 Ping Dec 01 2021 12:45 AM
10.82.8.228 Ping Dec 01 2021 12:45 AM
10.82.8.241 Ping Dec 01 2021 12:45 AM
12-02-2021 01:44 AM
These IPs were not given to the devices manually.
12-04-2021 05:35 PM
follow
12-05-2021 02:55 PM - edited 12-05-2021 03:04 PM
Hello
What you are seeing is due to ip dhcp conflicts being enabled (by default) when the dhcp pool is created and activated
Before an ip allocation the server will send a ping for that ip and if it receives a rely it won’t allocate that ip but will reserve it so it isn’t used,
When you do a sh ip dhcp confllcit that listing shows how many reply’s the server has had from its ping checks and then has registered as conflict, this ip listing will removed from the pool of available addresses in the dhcp scope < (Excluded addresses :xx)
To negate this, you can:
12-06-2021 06:22 AM
Thank you for your interest.
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