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ARP RESPONSE collision

blankguy7
Level 1
Level 1

‎04-15-2012 11:57 PM

Hi,

I've configured two ACE appliances with redundance (fault-tolerance VLAN).

Since the following messages appears on ACE's :

Apr 15 2012 14:43:59 : %ACE-4-405001: Received ARP RESPONSE collision from 192.168.10.253 e8.9a.8f.b2.68.7a on interface vlan100

Apr 15 2012 14:44:03 : %ACE-4-405001: Received ARP RESPONSE collision from 192.168.10.253 e8.9a.8f.b2.68.7a on interface vlan100

Apr 15 2012 14:44:05 : %ACE-4-405001: Received ARP RESPONSE collision from 192.168.10.253 e8.9a.8f.b2.68.7a on interface vlan100

Apr 15 2012 14:44:07 : %ACE-4-405001: Received ARP RESPONSE collision from 192.168.10.253 e8.9a.8f.b2.68.7a on interface vlan100

Apr 15 2012 14:44:09 : %ACE-4-405001: Received ARP RESPONSE collision from 192.168.10.253 e8.9a.8f.b2.68.7a on interface vlan100

ACE1/GAAS# sh arp

Context GAAS

================================================================================

IP ADDRESS      MAC-ADDRESS        Interface  Type      Encap  NextArp(s) Status

================================================================================

192.168.10.1    00.1f.9f.f1.a9.a1  vlan100   GATEWAY    10     43 sec       up

192.168.10.246  e8.9a.8f.b2.68.80  vlan100   INTERFACE  LOCAL     _         up

192.168.10.250  e8.9a.8f.b2.68.80  vlan100   VSERVER    LOCAL     _         up

192.168.10.253  e8.9a.8f.b2.68.80  vlan100   NAT        LOCAL     _         up

================================================================================

ACE2/GAAS# sh arp

Context GAAS

================================================================================

IP ADDRESS      MAC-ADDRESS        Interface  Type      Encap  NextArp(s) Status

================================================================================

192.168.10.1    00.1f.9f.f1.a9.a1  vlan100   GATEWAY    11     86 sec       up

192.168.10.247  e8.9a.8f.b2.68.7a  vlan100   INTERFACE  LOCAL     _         up

192.168.10.250  e8.9a.8f.b2.68.7a  vlan100   VSERVER    LOCAL     _         up

192.168.10.253  e8.9a.8f.b2.68.7a  vlan100   NAT        LOCAL     _         up

================================================================================

Total arp entries 4

Has someone an Idea?

Thanks in advance

Labels:
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10 Replies 10

Surya ARBY
Level 4
Level 4

‎04-16-2012 12:56 AM

Can you show us the config of the admin context ?

Have you allocated mac address pools with different numbers ?

shared-vlan-hostid / peer shared-vlan-hostid

0 Helpful

blankguy7
Level 1
Level 1
In response to Surya ARBY

‎04-16-2012 01:00 AM

sure, here's the admin context configuration :

ACE1/Admin# sh run

Generating configuration....

logging enable

logging buffered 4

logging queue 2000

boot system image:c4710ace-t1k9-mz.A5_1_2.bin

hostname ACE1

interface gigabitEthernet 1/1

  shutdown

interface gigabitEthernet 1/2

  switchport access vlan 100

  no shutdown

interface gigabitEthernet 1/3

  shutdown

interface gigabitEthernet 1/4

  switchport access vlan 200

  no shutdown

ft interface vlan 200

  ip address 10.1.1.2 255.255.255.0

  peer ip address 10.1.1.3 255.255.255.0

  no shutdown

ft peer 1

  heartbeat interval 300

  heartbeat count 10

  ft-interface vlan 200

ft group 1

  peer 1

  priority 150

  associate-context Admin

  inservice

context GAAS

  allocate-interface vlan 100

username admin password 5 $1$449pMeGu$NwD2lPttjANuMq/gxgv4A1  role Admin domain

default-domain

username www password 5 $1$w43pZtK3$ZllEobQFqTbdYWQl2V3.n0  role Admin domain de

fault-domain

ssh key dsa 1024 force

No, I've don't allocated mac address pools? Should I do that?

0 Helpful

Surya ARBY
Level 4
Level 4
In response to blankguy7

‎04-16-2012 01:08 AM

Yep.

Also can you give us the output of the "show ft group detail" ?

0 Helpful

blankguy7
Level 1
Level 1
In response to Surya ARBY

‎04-16-2012 01:10 AM

Here's :

ACE1/Admin# sh ft group detail

FT Group                     : 1

No. of Contexts              : 1

Context Name                 : Admin

Context Id                   : 0

Configured Status            : in-service

Maintenance mode             : MAINT_MODE_OFF

My State                     : FSM_FT_STATE_ACTIVE

My Config Priority           : 150

My Net Priority              : 150

My Preempt                   : Enabled

Peer State                   : FSM_FT_STATE_STANDBY_HOT

Peer Config Priority         : 100

Peer Net Priority            : 100

Peer Preempt                 : Enabled

Peer Id                      : 1

Last State Change time       : Fri Apr 13 14:52:15 2012

Running cfg sync enabled     : Enabled

Running cfg sync status      : Running configuration sync has completed

Startup cfg sync enabled     : Enabled

Startup cfg sync status      : Startup configuration sync has completed

Connection sync enabled      : Enabled

Bulk sync done for ARP       : 0

Bulk sync done for  LB       : 0

Bulk sync done for ICM       : 0

Bulk sync done for  ND       : 0

0 Helpful

Surya ARBY
Level 4
Level 4
In response to blankguy7

‎04-16-2012 01:19 AM

strange, you have different mac addresses on both units. The standby unit should never reply to arp requests

0 Helpful

blankguy7
Level 1
Level 1
In response to Surya ARBY

‎04-16-2012 01:25 AM

Now I've configure the following on the Admin context :

shared-vlan-hostid 1

peer shared-vlan-hostid 2

But I don't think that it's make something different?

ACE1/GAAS# sh arp

Context GAAS

================================================================================

IP ADDRESS      MAC-ADDRESS        Interface  Type      Encap  NextArp(s) Status

================================================================================

192.168.10.1    00.1f.9f.f1.a9.a1  vlan100   GATEWAY    10     133 sec      up

192.168.10.88   00.27.13.b8.d1.e0  vlan100   LEARNED    14     14233 sec    up

192.168.10.246  e8.9a.8f.b2.68.80  vlan100   INTERFACE  LOCAL     _         up

192.168.10.250  e8.9a.8f.b2.68.80  vlan100   VSERVER    LOCAL     _         up

192.168.10.253  e8.9a.8f.b2.68.80  vlan100   NAT        LOCAL     _         up

================================================================================

Total arp entries 5

ACE2/GAAS#  sh arp

Context GAAS

================================================================================

IP ADDRESS      MAC-ADDRESS        Interface  Type      Encap  NextArp(s) Status

================================================================================

192.168.10.1    00.1f.9f.f1.a9.a1  vlan100   GATEWAY    11     293 sec      up

192.168.10.247  e8.9a.8f.b2.68.7a  vlan100   INTERFACE  LOCAL     _         up

192.168.10.250  e8.9a.8f.b2.68.7a  vlan100   VSERVER    LOCAL     _         up

192.168.10.253  e8.9a.8f.b2.68.7a  vlan100   NAT        LOCAL     _         dn

================================================================================

Total arp entries 4

Thanks for your help!

0 Helpful

Surya ARBY
Level 4
Level 4
In response to blankguy7

‎04-16-2012 01:27 AM

Open a case, I don't know why the second ACE sends ARP messages.

0 Helpful

blankguy7
Level 1
Level 1
In response to Surya ARBY

‎04-16-2012 01:35 AM

Thanks a lot for your help!

Ok, I'll open a case...

0 Helpful

Surya ARBY
Level 4
Level 4
In response to blankguy7

‎04-16-2012 01:42 AM

Is there any impact on the service ? Arp collisions in L2 adjacent devices ?

Maybe this issue is purely cosmetic.

0 Helpful

blankguy7
Level 1
Level 1
In response to Surya ARBY

‎04-17-2012 01:22 AM

Hi Surya,

So, I've open a case by Cisco... and we've found the solution to my problem!

To help the communities I put the solution here :

I've configure one ft group for the Admin context and for the vlan in Admin context all was good!

But I've a another context and I don't have configure a ft group for this context and that was the problem...

Each context should be or must be defined by one ft group.

That's it

Best regards

0 Helpful
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