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Beginner

%IP-4-DUPADDR

Hi, 

 

C4507R-E-II#sh logg | i 10.10.101.1

Jul 22 13:52:20: %IP-4-DUPADDR: Duplicate address 10.10.101.1 on Vlan70, sourced by 0007.b400.4602
Jul 22 14:03:20: %IP-4-DUPADDR: Duplicate address 10.10.101.1 on Vlan70, sourced by 0007.b400.4602
Jul 22 14:18:08: %IP-4-DUPADDR: Duplicate address 10.10.101.1 on Vlan70, sourced by 0007.b400.4602
Jul 22 14:25:40: %IP-4-DUPADDR: Duplicate address 10.10.101.1 on Vlan70, sourced by 0007.b400.4602
Jul 22 14:31:52: %IP-4-DUPADDR: Duplicate address 10.10.101.1 on Vlan70, sourced by 0007.b400.4602
Jul 22 14:38:49: %IP-4-DUPADDR: Duplicate address 10.10.101.1 on Vlan70, sourced by 0007.b400.4602
Jul 22 14:50:24: %IP-4-DUPADDR: Duplicate address 10.10.101.1 on Vlan70, sourced by 0007.b400.4602
Jul 22 15:26:47: %IP-4-DUPADDR: Duplicate address 10.10.101.1 on Vlan70, sourced by 0007.b400.4602
Jul 22 15:43:17: %IP-4-DUPADDR: Duplicate address 10.10.101.1 on Vlan70, sourced by 0007.b400.4602

C4507R-E-II# sh run int vlan70

interface Vlan70
description Voice
ip address 10.10.101.254 255.255.255.0
glbp 70 ip 10.10.101.1
glbp 70 preempt
C4507R-E-IIsh glbp vlan 70
Vlan70 - Group 70
State is Standby
9 state changes, last state change 3w6d
Virtual IP address is 10.10.101.1
Hello time 3 sec, hold time 10 sec
Next hello sent in 2.304 secs
Redirect time 600 sec, forwarder timeout 14400 sec
Preemption enabled, min delay 0 sec
Active is 10.10.101.253, priority 200 (expires in 10.304 sec)
Standby is local
Priority 100 (default)
Weighting 100 (default 100), thresholds: lower 1, upper 100
Load balancing: round-robin
Group members:
0024.c46a.a1bf (10.10.101.253)
8843.e10d.387f (10.10.101.254) local
There are 2 forwarders (1 active)
Forwarder 1
State is Active
1 state change, last state change 3w6d
MAC address is 0007.b400.4601 (default)
Owner ID is 8843.e10d.387f
Preemption enabled, min delay 30 sec
Active is local, weighting 100
Client selection count: 80
Forwarder 2
State is Listen
6 state changes, last state change 3w6d
MAC address is 0007.b400.4602 (learnt)
Owner ID is 0024.c46a.a1bf
Time to live: 14398.976 sec (maximum 14400 sec)
Preemption enabled, min delay 30 sec
Active is 10.10.101.253 (primary), weighting 100 (expires in 10.880 sec)
Client selection count: 1

 

There are no such errors on other equipment:

C4507R-E-I#sh run int vlan70

interface Vlan70
description Voice
ip address 10.10.101.253 255.255.255.0
glbp 70 ip 10.10.101.1
glbp 70 priority 200
glbp 70 preempt

 

C4507R-E-I#sh glbp vlan 70
Vlan70 - Group 70
State is Active
3 state changes, last state change 3w6d
Virtual IP address is 10.10.101.1
Hello time 3 sec, hold time 10 sec
Next hello sent in 2.304 secs
Redirect time 600 sec, forwarder timeout 14400 sec
Preemption enabled, min delay 0 sec
Active is local
Standby is 10.10.101.254, priority 100 (expires in 9.568 sec)
Priority 200 (configured)
Weighting 100 (default 100), thresholds: lower 1, upper 100
Load balancing: round-robin
Group members:
0024.c46a.a1bf (10.10.101.253) local
8843.e10d.387f (10.10.101.254)
There are 2 forwarders (1 active)
Forwarder 1
State is Listen
2 state changes, last state change 3w6d
MAC address is 0007.b400.4601 (learnt)
Owner ID is 8843.e10d.387f
Redirection enabled, 599.584 sec remaining (maximum 600 sec)
Time to live: 14399.584 sec (maximum 14400 sec)
Preemption enabled, min delay 30 sec
Active is 10.10.101.254 (primary), weighting 100 (expires in 9.568 sec)
Client selection count: 211969
Forwarder 2
State is Active
3 state changes, last state change 3w6d
MAC address is 0007.b400.4602 (default)
Owner ID is 0024.c46a.a1bf
Redirection enabled
Preemption enabled, min delay 30 sec
Active is local, weighting 100
Client selection count: 211967

3 REPLIES 3
Hall of Fame Community Legend

Re: %IP-4-DUPADDR


@berik wrote:

Jul 22 13:52:20: %IP-4-DUPADDR: Duplicate address 10.10.101.1 on Vlan70, sourced by 0007.b400.4602


Trace where "0007.b400.4602" is connected to and shut down the port.

VIP Mentor

Re: %IP-4-DUPADDR

Hello,

 

I am not sure if configuring authentication can prevent this, you could give it a try. Configure the below on all routers belonging to the GLBP group:

 

glbp 70 authentication md5 key-string key-string

Highlighted

Re: %IP-4-DUPADDR

Hi

The virtual MAC address used with GLBP (Gateway Load Balancing Protocol) is 0007.b400.xxyy, where xx is the GLBP group number and yy is the AVF (Active Virtual Forwarder) number.

It should not be an issue.

Are you getting into a problem due to this?

SD-WAN Specialist
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