Enable VSX and VRRP

Core 1
interface lag 100
description VSX-ISL
no shutdown
no routing
vlan trunk native 1 tag
vlan trunk allowed all
lacp mode active

interface 1/1/49
no shutdown
lag 100
interface 1/1/50
no shutdown
lag 100

interface 1/1/48
no shutdown
ip address 10.10.10.1/30

vsx
system-mac 00:00:00:00:00:11
inter-switch-link lag 100
role primary
keepalive peer 10.10.10.2 source 10.10.10.1
vsx-sync vrrp

interface vlan 100
ip address 192.168.100.2/24
vrrp 150 address-family ipv4
address 192.168.100.1 primary
priority 110
no shutdown
exit

router vrrp enable

Core 2
interface lag 100
description VSX-ISL
no shutdown
no routing
vlan trunk native 1 tag
vlan trunk allowed all
lacp mode active

interface 1/1/49
no shutdown
lag 100
interface 1/1/50
no shutdown
lag 100

interface 1/1/48
no shutdown
ip address 10.10.10.2/30

vsx
system-mac 00:00:00:00:00:11
inter-switch-link lag 100
role secondary
keepalive peer 10.10.10.1 source 10.10.10.2
vsx-sync vrrp

interface vlan 100
ip address 192.168.100.3/24
vrrp 150 address-family ipv4
address 192.168.100.1 primary
priority 90
no shutdown
exit

router vrrp enable

Check Status
sh vsx status
sh vrrp

Test Failover
interface vlan 100
shutdown
sh vrrp
Failback
interface vlan 100
no shutdown
sh vrrp

Spanning-tree
Core 1
spanning-tree
spanning-tree mode mstp
spanning-tree priority 0

Core 2
spanning-tree
spanning-tree mode mstp
spanning-tree priority 1