> Source: [sk174303](https://support.checkpoint.com/results/sk/sk174303)

# sk174303 - VRRP interfaces flap with VRRP6 enabled

| Property | Value |
|----------|-------|
| Solution ID | sk174303 |
| Date Created | 2021-07-05 |
| Last Modified | 2021-07-12 |
| Technical Level | Advanced |
| Products | Security Gateway |
| Versions | R82.10, R82, R81.20 |

## Symptoms

- * Interfaces flap between Master -\> Backup or Backup -\> Master within the same second in /var/log/messages:   

  routed\[9326\]: \[routed\] NOTICE: task_timer_uset: timer VRRP_VRRP set to interval 0:01.0vrrp_vr_master: interface bond1, VRID 60: state=MASTER  
  routed\[9326\]: \[routed\] ERROR: Success (0) deleting Virtual MAC 00:00:5e:00:01:51 for Virtual IP 1.2.3.4 on interface bond1  
  routed\[9326\]: \[routed\] NOTICE: task_timer_uset: timer VRRP_VRRP set to offset 0:03.039215vrrp_vr_backup: interface bond1, VRID 60: state=BACKUP  
* Constant errors in /var/log/messages regarding overlapping address set:   
  routed\[9326\]: \[routed\] WARNING: vrrp6_valid_addr_list: Overlapping address set detected expecting: 2001:0db8:3c4d:0015:0000:0000:1a2f:1a2b fe80::1:1/64

## Cause

Link-local VIP and/or link-global VIP do not match on both cluster members.  

Example of problematic configuration:  

* Member A

HostnameA\> set ipv6 vrrp6 interface eth2.10 monitored-circuit vrid 11 address **fe80::250:56ff:fea3:4321** on  
HostnameA\> set ipv6 vrrp6 interface eth2.10 vrid 11 address 2610:18:8104:1A::5 on  
HostnameA\> set ipv6 vrrp6 interface eth2.10 vrid 11 hello-interval 100  

* Member B

HostnameB\> set ipv6 vrrp6 interface eth2.10 monitored-circuit vrid 11 address **fe80::250:56ff:fea3:1234** on  
HostnameB\> set ipv6 vrrp6 interface eth2.10 vrid 11 address 2610:18:8104:1A::5 on  
HostnameB\> set ipv6 vrrp6 interface eth2.10 vrid 11 hello-interval 100

## Solution

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