More information in case it helps get an answer:
I am setting up 3 A5500 switches to be deployed and I get duplicate IP address errors anytime I connect a device (PC) to switch1 and ping the PC from it's console port.
Switch1 132.156.60.3 /23 (really 2 A5500 switches stacked through 10Gb ports at the back so 1 appears as 1 switch)
[switch1]display irf configuration
MemberID NewID IRF-Port1 IRF-Port2
1 1 Ten-GigabitEthernet1/1/1 Ten-GigabitEthernet1/2/1
Ten-GigabitEthernet1/1/2 Ten-GigabitEthernet1/2/2
2 2 Ten-GigabitEthernet2/1/1 Ten-GigabitEthernet2/2/1
Ten-GigabitEthernet2/1/2 Ten-GigabitEthernet2/2/2
Switch2 132.156.60.13 /23
switch3 132.156.60.14 /23
Switch1 connected by Gi1/0/52 to switch2 Gi1/0/25, swtch2 connetced by Gi1/0/26 to switch3 Gi1/0/25
PC1 (connected to switch1 Gi1/0/40) 132.156.60.200 /23
PC2 (connected to switch2 Gi1/0/12) 132.156.60.100 /23
This error only happens on switch1, I can clear the ARP table on all the switches and it does not make any difference. For some reason it always comes back saying that the address is already used on port is Gi1/0/52 which is the access link to switch2
All switch ports on same VLAN, and no trunk ports.
There is nothing else connected on these switches and there are definitelly no duplicate addresses that would cause these errors.
I have tried with the 2 PCs that have different addresses and get the same result for both. Firmware was updated to the most current one an all the switches.
display version
HP Comware Platform Software
Comware Software, Version 5.20.99, Release 2220P02
Copyright (c) 2010-2013 Hewlett-Packard Development Company, L.P.
HP A5500-48G-PoE+ EI Switch with 2 Interface Slots uptime is 0 week, 0 day, 1 hour, 46 minutes
HP A5500-48G-PoE+ EI Switch with 2 Interface Slots with 1 Processor
256M bytes SDRAM
32768K bytes Flash Memory
Hardware Version is REV.C
CPLD Version is 002
Bootrom Version is 707
[SubSlot 0] 48GE+4SFP+POE Plus Hardware Version is REV.C
[SubSlot 1] 2 SFP+ Hardware Version is REV.A
[SubSlot 2] 2 SFP+ Hardware Version is REV.A
<switch1>display arp
Type: S-Static D-Dynamic
IP Address MAC Address VLAN ID Interface Aging Type
132.156.60.200 0015-609c-c17c 60 GE1/0/40 18 D
132.156.60.13 d07e-2884-0c7f 60 GE1/0/52 4 D
132.156.60.100 001b-38be-da74 60 GE1/0/52 20 D
From console on switch1, I then ping directly connetcted PC1 and immediatelly start to get duplicate IP errors
<switch1>ping 132.156.60.200
PING 132.156.60.200: 56 data bytes, press CTRL_C to break
%Apr 27 10:13:19:380 2000 BCC10-RM150 ARP/5/ARP_DUPLICATE_IPADDR_DETECT: Detected an IP address conflict. The device with MAC address 0015-609c-c17c connected to GigabitEthernet1/0/40 in VLAN 60 and the device with MAC address 0015-609c-c17c connected to GigabitEthernet1/0/52 in VLAN 60 are using the same IP address 132.156.60.200.
Request time out
Request time out
Request time out
Request time out
Request time out
--- 132.156.60.200 ping statistics ---
5 packet(s) transmitted
0 packet(s) received
100.00% packet loss
<switch1>display arp
Type: S-Static D-Dynamic
IP Address MAC Address VLAN ID Interface Aging Type
132.156.60.13 d07e-2884-0c7f 60 GE1/0/52 3 D
132.156.60.100 001b-38be-da74 60 GE1/0/52 20 D
132.156.60.200 0015-609c-c17c 60 GE1/0/52 20 D
If I disconnect Switch1 Gi1/0/52, no errors are reported. Also this error does not happen on the other 2 switches if I connect the PCs to them and ping them.
[switch1]display current-configuration
#
version 5.20.99, Release 2220P02
#
sysname switch1
#
irf mac-address persistent timer
irf auto-update enable
undo irf link-delay
#
domain default enable system
#
undo ip http enable
#
password-recovery enable
#
vlan 1
#
vlan 60
#
domain system
access-limit disable
state active
idle-cut disable
self-service-url disable
#
user-group system
group-attribute allow-guest
#
cwmp
undo cwmp enable
#
interface NULL0
#
interface Vlan-interface60
ip address 132.156.60.3 255.255.254.0
#
interface GigabitEthernet1/0/1
port link-mode bridge
port access vlan 60
(all ports repeat same config until Gi2/0/28)
interface GigabitEthernet2/0/28
port link-mode bridge
port access vlan 60
shutdown
#
interface Ten-GigabitEthernet1/1/1
#
interface Ten-GigabitEthernet1/1/2
#
interface Ten-GigabitEthernet1/2/1
#
interface Ten-GigabitEthernet1/2/2
#
interface Ten-GigabitEthernet2/1/1
#
interface Ten-GigabitEthernet2/1/2
#
interface Ten-GigabitEthernet2/2/1
#
interface Ten-GigabitEthernet2/2/2
#
load xml-configuration
#
load tr069-configuration
#
user-interface aux 0 1
user-interface vty 0 15
#
irf-port 1/1
port group interface Ten-GigabitEthernet1/1/1 mode normal
port group interface Ten-GigabitEthernet1/1/2 mode normal
#
irf-port 1/2
port group interface Ten-GigabitEthernet1/2/1 mode normal
port group interface Ten-GigabitEthernet1/2/2 mode normal
#
irf-port 2/1
port group interface Ten-GigabitEthernet2/1/1 mode normal
port group interface Ten-GigabitEthernet2/1/2 mode normal
#
irf-port 2/2
port group interface Ten-GigabitEthernet2/2/1 mode normal
port group interface Ten-GigabitEthernet2/2/2 mode normal
#
return
Any insights?