10-22-2015 01:00 PM - edited 03-05-2019 02:34 AM
I am having issues activating what is called the “DHCP Server Port-Based Address Allocation” feature on the new 3850 Model Cisco switch. This feature basically forces the DHCP server to handout a pre-assigned IP Address on a port basis. Without this feature the DHCP will walk through its range when issuing an IP Address and you may end up with a different IP address each time the Cisco switch sees a client plugged into the same port ( Cisco’s reference document, http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_dhcp/configuration/15-sy/dhcp-15-sy-book/dhcp-prt-bsd-aa.pdf.)
Currently when issuing a “reserved-only” (see page 7) command for the DHCP pool (pool1) that I created, the DHCP server fail to issue any OFFER to the client. If I issue a “no-reserved-only” command the OFFERS comes out, but not with the pre-assigned address we want. For example, the client is issued a “192.168.1.1” IP address, not the “192.168.1.182” we pre-assigned.
Attached is the non-working reserved-only running-config, along with some show command
I've also attached, the case for the one that connected (with not-pre-assigned address),once I issue the no-reserved command
Below is what the DHCP pool looks like:
Switch#show ip dhcp pool
Pool pool1 :
Utilization mark (high/low) : 100 / 0
Subnet size (first/next) : 0 / 0
Total addresses : 254
Leased addresses : 0
Excluded addresses : 3
Pending event : none
1 subnet is currently in the pool :
Current index IP address range Leased/Excluded/Total
192.168.1.1 192.168.1.1 - 192.168.1.254 0 / 3 / 254
3 reserved addresses are currently in the pool:
Address Client
192.168.1.189 Gi1/0/9
192.168.1.182 Gi1/0/2
192.168.1.192 Gi1/0/12
10-23-2015 03:43 AM
Hello
FYI -
I have tested this now on two different switch platforms and in both cases I obtain the same results that you have posted.
res
Paul
10-23-2015 08:35 AM
Thanks for you reply Paul,
We did have “DHCP Server Port-Based Address Allocation” feature working on an older 3750 Model Cisco switch.
Please advise; Does this appear to be due miss configuration? SW bug? Is there a workaround?
-Rafael
The SW version for the Model 3750 that worked
Cisco IOS Software, C3750 Software (C3750-IPBASEK9-M), Version 12.2(55)SE1, RELE
ASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Thu 02-Dec-10 07:46 by prod_rel_team
Image text-base: 0x01000000, data-base: 0x02D00000
The SW version for the Model 3850 that does not worked
Cisco IOS Software, IOS-XE Software, Catalyst L3 Switch Software (CAT3K_CAA-UNIV
ERSALK9-M), Version 03.03.05SE RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2014 by Cisco Systems, Inc.
Compiled Thu 30-Oct-14 13:12 by prod_rel_team
10-23-2015 03:16 PM
Hello Rafael
Thats interesting - I tested this feature with upto-date Ios on both switches and couldnt get it working
WS-C3750G-48PS
WS-C3650-48TS
res
Paul
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