diff --git a/tests/topotests/isis_lfa_topo1/test_isis_lfa_topo1.py b/tests/topotests/isis_lfa_topo1/test_isis_lfa_topo1.py
index 3a1d0b9514..fe92c9a52c 100755
--- a/tests/topotests/isis_lfa_topo1/test_isis_lfa_topo1.py
+++ b/tests/topotests/isis_lfa_topo1/test_isis_lfa_topo1.py
@@ -55,7 +55,6 @@ import os
 import sys
 import pytest
 import json
-import time
 import tempfile
 from functools import partial
 
@@ -704,116 +703,6 @@ def test_rib_ipv6_step16():
         )
 
 
-#
-# Step 17
-#
-# Action(s):
-# - Setting spf-delay-ietf init-delay of 15s
-#
-# Expected changes:
-# - No routing table change
-# - At the end of test, SPF reacts to a failure in 15s
-#
-def test_rib_ipv6_step17():
-    logger.info("Test (step 17): verify IPv6 RIB")
-    tgen = get_topogen()
-
-    # Skip if previous fatal error condition is raised
-    if tgen.routers_have_failure():
-        pytest.skip(tgen.errors)
-
-    logger.info(
-        "Unshut the interface to rt2 from the switch side and check fast-reroute"
-    )
-    tgen.net.cmd_raises("ip link set %s up" % tgen.net["s1"].intfs[0])
-
-    logger.info("Unset link-detect on rt1 eth-rt2")
-    # Unset link detection. We want zebra to consider linkdow as operationaly up
-    # in order that BFD triggers LFA instead of the interface down
-    tgen.net["rt1"].cmd('vtysh -c "conf t" -c "int eth-rt2" -c "no link-detect"')
-
-    for rname in ["rt1"]:
-        router_compare_json_output(
-            rname,
-            "show ipv6 route isis json",
-            outputs[rname][14]["show_ipv6_route.ref"],
-        )
-
-
-#
-# Step 18
-#
-# Action(s):
-# - shut the eth-rt2 interface on rt1
-#
-# Expected changes:
-# - Route switchover of routes via eth-rt2
-#
-def test_rib_ipv6_step18():
-    logger.info("Test (step 18): verify IPv6 RIB")
-    tgen = get_topogen()
-
-    # Skip if previous fatal error condition is raised
-    if tgen.routers_have_failure():
-        pytest.skip(tgen.errors)
-
-    logger.info("Shut the interface to rt2 from the switch side and check fast-reroute")
-    tgen.net.cmd_raises("ip link set %s down" % tgen.net["s1"].intfs[0])
-
-    rname = "rt1"
-
-    retry = 200 + 1
-
-    while retry:
-        retry -= 1
-        output = tgen.gears[rname].vtysh_cmd("show isis neighbor json")
-        output_json = json.loads(output)
-        found = False
-        for neighbor in output_json["areas"][0]["circuits"]:
-            if "adj" in neighbor and neighbor["adj"] == "rt2":
-                found = True
-                break
-        if not found:
-            break
-        time.sleep(0.05)
-
-    assert not found, "rt2 neighbor is still present"
-
-    router_compare_json_output(
-        rname,
-        "show ipv6 route isis json",
-        outputs[rname][15]["show_ipv6_route.ref"],
-        count=2,
-        wait=0.05,
-    )
-
-
-#
-# Step 19
-#
-# Action(s): wait for the convergence and SPF computation on rt1
-#
-# Expected changes:
-# - convergence of IPv6 RIB
-#
-def test_rib_ipv6_step19():
-    logger.info("Test (step 19): verify IPv6 RIB")
-    tgen = get_topogen()
-
-    # Skip if previous fatal error condition is raised
-    if tgen.routers_have_failure():
-        pytest.skip(tgen.errors)
-
-    logger.info("Check SPF convergence")
-
-    for rname in ["rt1"]:
-        router_compare_json_output(
-            rname,
-            "show ipv6 route isis json",
-            outputs[rname][16]["show_ipv6_route.ref"],
-        )
-
-
 # Memory leak test template
 def test_memory_leak():
     "Run the memory leak test and report results."