VRRP Issue when Master router is back online

RouterOS General
1

Hello,

I have setup VRRP on RB750 and RB951. Both routers are running 6.38. When the Master is down, the backup takes over in few seconds and works as expected. However, when the Masters come back online, there is a brief outage of 2-3 minutes. Any advise?

Thank you,
Meheretab

Here is my configuration on both routers:-

On RB750 (Master Router):

/system script
add name=vrrp-master owner=admin policy=ftp,reboot,read,write,policy,test,password,sniff,sensitive,romon source=“:delay 10;
\n/interface vrrp set [/interface vrrp find vrid=11] priority=120;
\n/interface vrrp set [/interface vrrp find vrid=12] priority=120;
add name=vrrp-backup owner=admin policy=ftp,reboot,read,write,policy,test,password,sniff,sensitive,romon source=”:delay 10;
\n/interface vrrp set [/interface vrrp find vrid=11] priority=91;
\n/interface vrrp set [/interface vrrp find vrid=12] priority=92;

/tool netwatch
add down-script=vrrp-backup host=8.8.8.8 interval=30s timeout=2s up-script=vrrp-master

/interface vrrp
add comment=“LAN Gateway” interface=ether2-master-local name=vrrp-LAN-Gateway priority=120 vrid=11
add comment=“Voice Gateway” interface=vLAN20 name=vrrp-vLAN_Gateway priority=120 vrid=12

/ip address
add address=192.168.88.3/24 comment=“default configuration” interface=ether2-master-local network=192.168.88.0
add address=192.168.88.1 interface=vrrp-LAN-Gateway network=192.168.88.1
add address=192.168.20.3/24 interface=vLAN20 network=192.168.20.0
add address=192.168.20.1 interface=vrrp-vLAN_Gateway network=192.168.20.1



On RB951 (Backup Router):

/interface vrrp
add comment=“LAN Gateway” interface=bridge-local name=vrrp-LAN-Gateway priority=120 vrid=11
add comment=“Voice Gateway” interface=vLAN20 name=vrrp-vLAN_Gateway priority=120 vrid=12


/ip address
add address=192.168.88.2/24 comment=“default configuration” interface=bridge-local network=192.168.88.0
add address=192.168.88.1 interface=vrrp-LAN-Gateway network=192.168.88.1
add address=192.168.20.2/24 interface=vLAN20 network=192.168.20.0
add address=192.168.20.1 interface=vrrp-vLAN_Gateway network=192.168.20.1

2

I have found the same issue. Did you figure out what causes it or how to fix it yet?

3

Is there a difference when testing using routeros version 6.37.1 ?

Since i`m having some issues with the following change in 6.38

Important note!!!
RouterOS v6.38 contains STP/RSTP changes which makes bridges compatible with IEEE 802.1Q-2014 by sending and processing BPDU packets without VLAN tag.
To avoid STP/RSTP compatibility issues with older RouterOS versions, upgrade RouterOS to v6.38 on all routers in Layer2 networks with VLAN and STP/RSTP configurations.
The recommended procedure is to start by upgrading the remotest routers and gradually do it to the Root Bridge device.
If after upgrade you experience loss of connectivity, then disabling STP/RSTP on RouterOS bridge interface will restore connectivity so you can complete upgrade process on your network.