diff --git a/octavia_tempest_plugin/common/constants.py b/octavia_tempest_plugin/common/constants.py
index c7bb82b..7ac8f1c 100644
--- a/octavia_tempest_plugin/common/constants.py
+++ b/octavia_tempest_plugin/common/constants.py
@@ -37,6 +37,21 @@
 VIP_PORT_ID = 'vip_port_id'
 VIP_SUBNET_ID = 'vip_subnet_id'
 VIP_QOS_POLICY_ID = 'vip_qos_policy_id'
+PROTOCOL = 'protocol'
+PROTOCOL_PORT = 'protocol_port'
+LOADBALANCER_ID = 'loadbalancer_id'
+CONNECTION_LIMIT = 'connection_limit'
+INSERT_HEADERS = 'insert_headers'
+X_FORWARDED_FOR = 'X-Forwarded-For'
+X_FORWARDED_PORT = 'X-Forwarded-Port'
+TIMEOUT_CLIENT_DATA = 'timeout_client_data'
+TIMEOUT_MEMBER_CONNECT = 'timeout_member_connect'
+TIMEOUT_MEMBER_DATA = 'timeout_member_data'
+TIMEOUT_TCP_INSPECT = 'timeout_tcp_inspect'
+DEFAULT_TLS_CONTAINER_REF = 'default_tls_container_ref'
+SNI_CONTAINER_REFS = 'sni_container_refs'
+DEFAULT_POOL_ID = 'default_pool_id'
+L7_POLICIES = 'l7_policies'
 
 # API valid fields
 SHOW_LOAD_BALANCER_RESPONSE_FIELDS = (
@@ -45,6 +60,15 @@
     UPDATED_AT, VIP_ADDRESS, VIP_NETWORK_ID, VIP_PORT_ID, VIP_SUBNET_ID,
     VIP_QOS_POLICY_ID)
 
+SHOW_LISTENER_RESPONSE_FIELDS = (
+    ID, NAME, DESCRIPTION, PROVISIONING_STATUS, OPERATING_STATUS,
+    ADMIN_STATE_UP, PROTOCOL, PROTOCOL_PORT, CONNECTION_LIMIT,
+    DEFAULT_TLS_CONTAINER_REF, SNI_CONTAINER_REFS, PROJECT_ID,
+    DEFAULT_POOL_ID, L7_POLICIES, INSERT_HEADERS, CREATED_AT, UPDATED_AT,
+    TIMEOUT_CLIENT_DATA, TIMEOUT_MEMBER_CONNECT, TIMEOUT_MEMBER_DATA,
+    TIMEOUT_TCP_INSPECT
+)
+
 # Other constants
 ACTIVE = 'ACTIVE'
 ADMIN_STATE_UP_TRUE = 'true'
@@ -56,6 +80,11 @@
 ONLINE = 'ONLINE'
 SORT = 'sort'
 
+# Protocols
+HTTP = 'HTTP'
+HTTPS = 'HTTPS'
+TCP = 'TCP'
+
 # RBAC options
 ADVANCED = 'advanced'
 OWNERADMIN = 'owner_or_admin'