P4000 - ALB - Switch IRF

[VALERIA TONIOLO]

We have 4 nodes p4500 g2 connected to 4 switch A5120-EL, this switch was installed about 1 year ago, initially no problem, today after a recent upgrade the san iq to 11.5 we note some errors on the switch:

Nov  5 15:28:00:618 2014 ARP Notification ARP_DUPLICATE_IPADDR_DETECT -Slot=3; Detected an IP address conflict. The device with MAC address 78e3-b511-b879 connected to GigabitEthernet4/0/6 in VLAN 1 and the device with MAC address 78e3-b511-b878 connected to GigabitEthernet3/0/6 in VLAN 1 are using the same IP address 10.100.0.155. Nov  5 15:27:58:611 2014 ARP Notification ARP_DUPLICATE_IPADDR_DETECT -Slot=4; Detected an IP address conflict. The device with MAC address d8d3-85e6-63d4 connected to GigabitEthernet3/0/5 in VLAN 1 and the device with MAC address d8d3-85e6-63d5 connected to GigabitEthernet4/0/5 in VLAN 1 are using the same IP address 10.100.0.134. Nov  5 15:09:00:502 2014 ARP Notification ARP_DUPLICATE_IPADDR_DETECT -Slot=4; Detected an IP address conflict. The device with MAC address 78e3-b511-b878 connected to GigabitEthernet3/0/6 in VLAN 1 and the device with MAC address 78e3-b511-b879 connected to GigabitEthernet4/0/6 in VLAN 1 are using the same IP address 10.100.0.155. Nov  5 15:08:58:525 2014 ARP Notification ARP_DUPLICATE_IPADDR_DETECT -Slot=3; Detected an IP address conflict. The device with MAC address d8d3-85e6-63d5 connected to GigabitEthernet4/0/5 in VLAN 1 and the device with MAC address d8d3-85e6-63d4 connected to GigabitEthernet3/0/5 in VLAN 

Thanks.

Regards.

A.Pilotti

P.S. This thread has been moved from Storage Area Networks (SAN) (Enterprise) to HP StoreVirtual Storage / LeftHand. -HP Forum Moderator

[VALERIA TONIOLO]

The 4 switch are interconnected at 10GBe and IRF is configured.

Thanks.

Regards.

A.Pilotti

[VALERIA TONIOLO]

The Network Bond on 4 nodes is configured with ALB.

Thanks.

Regards.

A.Pilotti

[VALERIA TONIOLO]

On the same 4 switch is connected another cluster Lefthand with 2 node p4530 with 4 port Gbe configured with ALB, 8 ports in total, 2 ports for switch (4),  and the error ARP_DUPLICATE_IPADDR_DETECT not appear for these ports.

The san iq os on the p4530 is 11.5, the same build of the other 4 node p4500g2.

Thanks.

Regards.

A.Pilotti

[HPstorageTom]

Valeria, if you are setting up the switches in IRF, then you better set up the StoreVirtual nodes with LACP bonding instead of ALB bonding.

[mtzkir]

 HI,

It seems that I've met the same situation on A5500. My user (probably) use Windows RLB,

Solaris IP-Multipath and Linux bonding balance-alb. I took a look linux bonding driver code

and found balance-alb may send out ARPOP_REPLY with different MAC addr between hosts.

see: 

    http://lxr.free-electrons.com/source/drivers/net/bonding/bond_alb.c#L1363

    ETH_P_ARP case and

    http://lxr.free-electrons.com/source/drivers/net/bonding/bond_alb.c#L678

    ARPOP_REPLY case

so I think it cannot be helped to log ARP_DUPLICATE_IPADDR_DETECT with ALB, but...

It's my turn. I have a few another trouble with A5500. HP care support center who I contact

with said they can not investigate, analyze those trouble because of too much ARP_DUP.. log.

I think as HPStrageTom said, LACP is better solution but we have  many ALB servers that

is hard to stop network. My question is:

Is there any way to stop ARP_DUP.. log in RLB/ALB/IP-Multipath server existing network

without changing loglevel?

Thanks.