Hi CSC,
I have some question about HSRP in 3750 switch. I have two Cisco 3750 switch which configured HSRP. Let say, we have interface vlan 100 that join in HSRP group member 1. The configuration on both switch is like as follows :
SWI-3750-A (Active)
==========
interface Vlan100
description *** gateway User NPL ***
ip address 10.8.51.253 255.255.255.0
ip access-group BLOK-AV in
standby 1 ip 10.8.51.254
standby 1 timers 5 20
standby 1 priority 105
standby 1 preempt
bridge-group 1
SWI-3750-B (Passive/Standby)
==========
interface Vlan100
description *** gateway User NPL ***
ip address 10.8.51.252 255.255.255.0
ip access-group BLOK445 in
standby 1 ip 10.8.51.254
standby 1 timers 5 20
standby 1 priority 95
standby 1 preempt
SWI-3750-A#show standby vlan 100
Vlan100 - Group 1
State is Active
1 state change, last state change 29w4d
Virtual IP address is 10.8.51.254
Active virtual MAC address is 0000.0c07.ac01
Local virtual MAC address is 0000.0c07.ac01 (v1 default)
Hello time 5 sec, hold time 20 sec
Next hello sent in 4.287 secs
Preemption enabled
Active router is local
Standby router is 10.8.51.252, priority 95 (expires in 18.095 sec)
Priority 105 (configured 105)
IP redundancy name is "hsrp-Vl100-1" (default)
The problem is, in Active switch log there is notifications about duplicate IP address sourced by Virtual MAC Address. The duplicate IP address is IP that belongs to Active switch interface vlan 100 (10.8.51.253).
Log Error :
Oct 17 15:56:08.379 IND: %HSRP-4-DUPADDR: Duplicate address 10.8.51.253 on Vlan100, sourced by 0000.0c07.ac01
Oct 17 16:13:00.759 IND: %HSRP-4-DUPADDR: Duplicate address 10.8.51.253 on Vlan100, sourced by 0000.0c07.ac01
Oct 17 16:15:46.026 IND: %HSRP-4-DUPADDR: Duplicate address 10.8.51.253 on Vlan100, sourced by 0000.0c07.ac01
Oct 17 16:47:04.974 IND: %HSRP-4-DUPADDR: Duplicate address 10.8.51.253 on Vlan100, sourced by 0000.0c07.ac01
Oct 17 17:00:41.678 IND: %HSRP-4-DUPADDR: Duplicate address 10.8.51.253 on Vlan100, sourced by 0000.0c07.ac01
Can anybody give the clue why it can be happened? Is this about looping / spanning-tree issue ?
Regards,
Rp
