Crie a Vlan de gerencia e passe na porta de uplink:
vlan 200
name gerencia
interface gigabit-ethernet-1/1/1
Configure a interface l3 e adicione o IP de gerencia na Vlan:
interface l3 vlan200-gerencia
description gerencia
lower-layer-if vlan 200
ipv4 address 172.18.114.2/27
Configure o gateway:
router static address-family ipv4 0.0.0.0/0 next-hop 172.18.114.1