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P4000 - ALB - Switch IRF

VALERIA TONIOLO
Occasional Contributor

P4000 - ALB - Switch IRF

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

5 REPLIES
VALERIA TONIOLO
Occasional Contributor

Re: P4000 - ALB - Switch IRF

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

Thanks.

Regards.

A.Pilotti

VALERIA TONIOLO
Occasional Contributor

Re: P4000 - ALB - Switch IRF

The Network Bond on 4 nodes is configured with ALB.

Thanks.

Regards.

A.Pilotti

VALERIA TONIOLO
Occasional Contributor

Re: P4000 - ALB - Switch IRF

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
HPE Pro

Re: P4000 - ALB - Switch IRF

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
Occasional Visitor

Re: P4000 - ALB - Switch IRF

 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.