wrong duplicate IP error messages on A5500

[lsaumure]

I am setting up 3 A5500 switches to be deployed and I get duplicate IP address errors anytime I connect a device to one of the switches.

It only happens on one switch, 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 another port (the port is Gi1/0/52 and is the access link to the other switch)

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 tha would cause these errors. 

Apr 26 13:33:50:066 2000 BCC10-RM150 ARP/5/ARP_DUPLICATE_IPADDR_DETECT: Detected an IP address conflict. The device with MAC address 001b-38be-da74 connected to GigabitEthernet1/0/52 in VLAN 60 and the device with MAC address 001b-38be-da74 connected to GigabitEthernet1/0/18 in VLAN 60 are using the same IP address 132.156.60.100.

I have tried with 2 different devices 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

[lsaumure]

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?

[dunipj]

Hi,

Did you get any solution for the problem ? I'm with the same problem here, messages ARP_DUPLICATE_IPADDR_DETECT, but i'm sure that there isn't duplicated MAC. I've two A5500 and i'm using IRF too.

Tks

[Fredke]

Does anyone have a sollution for this problem, i have the same issue.

[KrisVe]

Same problem here, has anyone found a solution?

Kind regards,

Kris

[MichaelM55]

system-view
mac-address mac-roaming enable

 Let´s see whether this will help...

As alway try latest firmware (boot-loader and bootrom): R2220P10

[paulgear]

Hi Michael,

Which switch models would you expect that command to be available on?  I've got a 3100 EI v2 on 5203P03 reporting this message, but there's no sign of the mac-roaming option.

[paulgear]

And a quick follow-up: this page suggests that "arp ip-conflict prompt" might be useful http://translate.google.com.au/translate?hl=en&sl=zh-CN&u=http://forum.h3c.com/forum.php%3Fmod%3Dviewthread%26action%3Dprintable%26tid%3D141911&prev=/search%3Fq%3D%2522ARP_DUPLICATE_IPADDR_DETECT%2522%26hl%3Den%26biw%3D1920%26bih%3D959

However, the manuals suggest that this is related to gratuitous ARP, not ARP in general (although in my case the ARP frame may be gratuitous).

[Bo Mathiasen]

Hi there

did any of you find the cause and solution to this problem. We are seeing the same error, and we are also using A5500 in IRF.

BR

Bo

[it_ejvnior]

Hi.

I have the same issue on my environment.
The scenario is:

1 HP A5500 HI 48G as the network core.
5 HPE V1910 48G connected to the core switch through a 2GB LAG each switch.
1 Cisco ASA 5505 plugged in the GI1/0/48 (core).

Some VLANs was created in the switches.

The default gateway of the network is the switch core and they has a static route, routing all the traffic to the firewall.
The firewall has a static route, routing all the traffic to the WAN IP.

I'm quite sure about the LAN's IP addresses and every day I receive a message posted below:

Detected an IP address conflict. The device with MAC address 7081-05be-9b7e connected to Bridge-Aggregation5 in VLAN 1 and the device with MAC address 7081-05be-9b7e connected to Bridge-Aggregation7 in VLAN 1 are using the same IP address 192.168.11.23.

But this specific device is plugged in in the Switch called 7 in the network. The LAGs received the number that corresponds to the switch name to identify the traffic.

What should I do to solve this issue?

Thanks in advance.