Description

VRRP flaps observed on MX80 router

Symptoms

VRRP flap observed after interface flaps

Solution

It was confirmed VRRP failed over after the interface went down, later got the mastership after the interface went up again. This is expected behavior, the customer confirmed there was a transient event on the involved interface

 

Interface going donw cause the VRRP to loose the mastership and became backup:

Jun 23 16:02:23.731 <host> rpd[2197]: RPD_ISIS_ADJDOWN: IS-IS lost L2 adjacency to <host> on xe-0/0/0.0, reason: Interface Down

Jun 23 16:02:24.234 <host> vrrpd[2009]: VRRPD_NEW_BACKUP: Interface ae0.101 (local address ) became VRRP backup for group 12

Jun 23 16:02:24.264 <host> vrrpd[2009]: VRRPD_NEW_BACKUP: Interface ae0.101 (local address ) became VRRP backup for group 112

Jun 23 16:02:24.267 <host> vrrpd[2009]: VRRPD_NEW_BACKUP: Interface ae0.113 (local address ) became VRRP backup for group 23

 

Once the interface came up, VRRP came back to Master

Jun 23 16:06:51.407 <host> mib2d[2000]: SNMP_TRAP_LINK_UP: ifIndex 512, ifAdminStatus up(1), ifOperStatus up(1), ifName xe-0/0/0

Jun 23 16:06:51.758 <host> vrrpd[2009]: VRRPD_NEW_MASTER: Interface ae0.101 (local address ) became VRRP master for group 12 with master reason priority

Jun 23 16:06:51.760 <host> vrrpd[2009]: VRRPD_NEW_MASTER: Interface ae0.113 (local address ) became VRRP master for group 23 with master reason priority

Modification History

2024-06-30 : Article Created