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Merge pull request #9944 from ARShreenidhi/tcp_mss_testcase

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tests: testcase to configure and verity tcp mss with vrf
This commit is contained in:
Russ White 2021-11-16 09:56:48 -05:00 committed by GitHub
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tests/topotests/bgp_tcp_mss/bgp_vrf_tcp_mss.json Normal file
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{
"address_types": [
"ipv4",
"ipv6"
],
"ipv4base": "20.20.20.0",
"ipv4mask": 24,
"ipv6base": "fd00::",
"ipv6mask": 64,
"link_ip_start": {
"ipv4": "10.10.10.0",
"v4mask": 24,
"ipv6": "fd00::",
"v6mask": 64
},
"lo_prefix": {
"ipv4": "1.0.",
"v4mask": 24,
"ipv6": "2001:db8:f::",
"v6mask": 128
},
"routers": {
"r1": {
"links": {
"r2-link1": {
"ipv4": "auto",
"ipv6": "auto",
"vrf": "RED"
}
},
"vrfs": [
{
"name": "RED",
"id": "1"
}
],
"bgp": [
{
"local_as": "100",
"vrf": "RED",
"address_family": {
"ipv4": {
"unicast": {
"neighbor": {
"r2": {
"dest_link": {
"r1-link1": {}
}
}
},
"redistribute": [
{
"redist_type": "static"
}
]
}
},
"ipv6": {
"unicast": {
"neighbor": {
"r2": {
"dest_link": {
"r1-link1": {}
}
}
},
"redistribute": [
{
"redist_type": "static"
}
]
}
}
}
}
]
},
"r2": {
"links": {
"r1-link1": {
"ipv4": "auto",
"ipv6": "auto",
"vrf": "RED"
},
"r3-link1": {
"ipv4": "auto",
"ipv6": "auto"
}
},
"vrfs": [
{
"name": "RED",
"id": "1"
}
],
"bgp": [
{
"local_as": "200",
"address_family": {
"ipv4": {
"unicast": {
"neighbor": {
"r3": {
"dest_link": {
"r2-link1": {}
}
}
},
"redistribute": [
{
"redist_type": "static"
}
]
}
},
"ipv6": {
"unicast": {
"neighbor": {
"r3": {
"dest_link": {
"r2-link1": {}
}
}
},
"redistribute": [
{
"redist_type": "static"
}
]
}
}
}
},
{
"local_as": "200",
"vrf": "RED",
"address_family": {
"ipv4": {
"unicast": {
"neighbor": {
"r1": {
"dest_link": {
"r2-link1": {}
}
}
},
"redistribute": [
{
"redist_type": "static"
}
]
}
},
"ipv6": {
"unicast": {
"neighbor": {
"r1": {
"dest_link": {
"r2-link1": {}
}
}
},
"redistribute": [
{
"redist_type": "static"
}
]
}
}
}
}
]
},
"r3": {
"links": {
"r2-link1": {
"ipv4": "auto",
"ipv6": "auto"
}
},
"bgp": [
{
"local_as": "300",
"address_family": {
"ipv4": {
"unicast": {
"neighbor": {
"r2": {
"dest_link": {
"r3-link1": {}
}
}
},
"redistribute": [
{
"redist_type": "static"
}
]
}
},
"ipv6": {
"unicast": {
"neighbor": {
"r2": {
"dest_link": {
"r3-link1": {}
}
}
},
"redistribute": [
{
"redist_type": "static"
}
]
}
}
}
}
]
}
}
}

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tests/topotests/bgp_tcp_mss/test_bgp_vrf_tcp_mss.py Normal file
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#!/usr/bin/env python
#
# bgp_tcp_mss.py
# Part of NetDEF Topology Tests
#
# Copyright (c) 2021 by
# Shreenidhi A R <rshreenidhi@vmware.com>
#
# Permission to use, copy, modify, and/or distribute this software
# for any purpose with or without fee is hereby granted, provided
# that the above copyright notice and this permission notice appear
# in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
# OF THIS SOFTWARE.
#
"""
bgp_tcp_mss_vrf.py:
Need to verify if the tcp-mss value is reflected in the TCP session and in VRF.
"""
import os
import sys
import json
import pytest
import functools
import platform
import socket
import subprocess
# add after imports, before defining classes or functions:
pytestmark = [pytest.mark.bgpd]
CWD = os.path.dirname(os.path.realpath(__file__))
sys.path.append(os.path.join(CWD, "../"))
# pylint: disable=C0413
from lib import topotest
from lib.topogen import Topogen, TopoRouter, get_topogen
from lib.topojson import build_config_from_json
from lib.topolog import logger
import time
from lib.bgp import (
clear_bgp,
clear_bgp_and_verify,
create_router_bgp,
modify_as_number,
verify_as_numbers,
verify_bgp_convergence,
verify_bgp_rib,
verify_bgp_timers_and_functionality,
verify_router_id,
verify_tcp_mss
)
from lib.common_config import (
kill_router_daemons,
start_router_daemons,
addKernelRoute,
apply_raw_config,
check_address_types,
create_prefix_lists,
create_route_maps,
create_static_routes,
required_linux_kernel_version,
reset_config_on_routers,
start_topology,
step,
verify_admin_distance_for_static_routes,
verify_bgp_community,
verify_fib_routes,
verify_rib,
write_test_footer,
write_test_header
)
pytestmark = [pytest.mark.bgpd]
# Global variables
NETWORK1_1 = {"ipv4": "1.1.1.1/32", "ipv6": "1::1/128"}
NETWORK1_2 = {"ipv4": "1.1.1.2/32", "ipv6": "1::2/128"}
NETWORK2_1 = {"ipv4": "2.1.1.1/32", "ipv6": "2::1/128"}
NETWORK2_2 = {"ipv4": "2.1.1.2/32", "ipv6": "2::2/128"}
NETWORK3_1 = {"ipv4": "3.1.1.1/32", "ipv6": "3::1/128"}
NETWORK3_2 = {"ipv4": "3.1.1.2/32", "ipv6": "3::2/128"}
NETWORK4_1 = {"ipv4": "4.1.1.1/32", "ipv6": "4::1/128"}
NETWORK4_2 = {"ipv4": "4.1.1.2/32", "ipv6": "4::2/128"}
NETWORK5_1 = {"ipv4": "5.1.1.1/32", "ipv6": "5::1/128"}
NETWORK5_2 = {"ipv4": "5.1.1.2/32", "ipv6": "5::2/128"}
NEXT_HOP_IP = {"ipv4": "Null0", "ipv6": "Null0"}
## File name
TCPDUMP_FILE="test_tcp_packet_test.txt"
def setup_module(mod):
"""
Sets up the pytest environment
* `mod`: module name
"""
global topo,TCPDUMP_FILE
# Required linux kernel version for this suite to run.
result = required_linux_kernel_version("4.15")
if result is not True:
pytest.skip("Kernel requirements are not met")
testsuite_run_time = time.asctime(time.localtime(time.time()))
step("Testsuite start time: {}".format(testsuite_run_time))
step("=" * 40)
step("Running setup_module to create topology")
# This function initiates the topology build with Topogen...
json_file = "{}/bgp_vrf_tcp_mss.json".format(CWD)
tgen = Topogen(json_file, mod.__name__)
global topo
topo = tgen.json_topo
# ... and here it calls Mininet initialization functions.
# Starting topology, create tmp files which are loaded to routers
# to start deamons and then start routers
start_topology(tgen)
# Creating configuration from JSON
build_config_from_json(tgen, topo)
global ADDR_TYPES
global BGP_CONVERGENCE
ADDR_TYPES = check_address_types()
BGP_CONVERGENCE = verify_bgp_convergence(tgen, topo)
assert BGP_CONVERGENCE is True, "setup_module :Failed \n Error: {}".format(
BGP_CONVERGENCE
)
step("Running setup_module() done")
def teardown_module():
"""Teardown the pytest environment"""
step("Running teardown_module to delete topology")
tgen = get_topogen()
# Stop toplogy and Remove tmp files
tgen.stop_topology()
step(
"Testsuite end time: {}".format(time.asctime(time.localtime(time.time())))
)
step("=" * 40)
#####################################################
#
# Testcases
#
#####################################################
def test_bgp_vrf_tcp_mss(request):
tgen = get_topogen()
tc_name = request.node.name
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
step("Verify the router failures")
if tgen.routers_have_failure():
check_router_status(tgen)
step("Configuring 5 static Routes in Router R3 with NULL0 as Next hop")
for addr_type in ADDR_TYPES:
static_routes_input = {
"r3": {
"static_routes": [
{
"network": [NETWORK1_1[addr_type]] + [NETWORK1_2[addr_type]],
"next_hop": NEXT_HOP_IP[addr_type],
},
{
"network": [NETWORK2_1[addr_type]] + [NETWORK2_2[addr_type]],
"next_hop": NEXT_HOP_IP[addr_type],
},
{
"network": [NETWORK3_1[addr_type]] + [NETWORK3_2[addr_type]],
"next_hop": NEXT_HOP_IP[addr_type],
},
{
"network": [NETWORK4_1[addr_type]] + [NETWORK4_2[addr_type]],
"next_hop": NEXT_HOP_IP[addr_type],
},
{
"network": [NETWORK5_1[addr_type]] + [NETWORK5_2[addr_type]],
"next_hop": NEXT_HOP_IP[addr_type],
},
]
}
}
result = create_static_routes(tgen, static_routes_input)
assert result is True, "Testcase {} : Failed \n Error: {}".format(
tc_name, result
)
step("Verify the static Routes in R3 on default VRF")
for addr_type in ADDR_TYPES:
static_routes_input = {
"r3": {
"static_routes": [
{
"network": [NETWORK1_1[addr_type]] + [NETWORK1_2[addr_type]],
"next_hop": NEXT_HOP_IP[addr_type],
},
{
"network": [NETWORK2_1[addr_type]] + [NETWORK2_2[addr_type]],
"next_hop": NEXT_HOP_IP[addr_type],
},
{
"network": [NETWORK3_1[addr_type]] + [NETWORK3_2[addr_type]],
"next_hop": NEXT_HOP_IP[addr_type],
},
{
"network": [NETWORK4_1[addr_type]] + [NETWORK4_2[addr_type]],
"next_hop": NEXT_HOP_IP[addr_type],
},
{
"network": [NETWORK5_1[addr_type]] + [NETWORK5_2[addr_type]],
"next_hop": NEXT_HOP_IP[addr_type],
},
]
}
}
dut = "r3"
result = verify_bgp_rib(tgen, addr_type, dut, static_routes_input)
assert result is True, "Testcase {} :Failed \n Error {}".format(tc_name, result)
step("Verify the static Routes in R2 on default VRF")
for addr_type in ADDR_TYPES:
static_routes_input = {
"r3": {
"static_routes": [
{
"network": [NETWORK1_1[addr_type]] + [NETWORK1_2[addr_type]],
"next_hop": NEXT_HOP_IP[addr_type],
},
{
"network": [NETWORK2_1[addr_type]] + [NETWORK2_2[addr_type]],
"next_hop": NEXT_HOP_IP[addr_type],
},
{
"network": [NETWORK3_1[addr_type]] + [NETWORK3_2[addr_type]],
"next_hop": NEXT_HOP_IP[addr_type],
},
{
"network": [NETWORK4_1[addr_type]] + [NETWORK4_2[addr_type]],
"next_hop": NEXT_HOP_IP[addr_type],
},
{
"network": [NETWORK5_1[addr_type]] + [NETWORK5_2[addr_type]],
"next_hop": NEXT_HOP_IP[addr_type],
},
]
}
}
dut = "r2"
result = verify_bgp_rib(tgen, addr_type, dut, static_routes_input)
assert result is True, "Testcase {} :Failed \n Error {}".format(tc_name, result)
step("importing default vrf on R2 under VRF RED Address Family")
for addr_type in ADDR_TYPES:
input_import_vrf = {
"r2": {
"bgp": [
{
"local_as": 200,
"vrf": "RED",
"address_family": {
addr_type: {"unicast": {"import": {"vrf": "default"}}}
},
}
]
}
}
result = create_router_bgp(tgen, topo, input_import_vrf)
assert result is True, "Testcase {} : Failed \n Error: {}".format(
tc_name, result
)
step("Verify the static Routes in R2 on RED VRF")
for addr_type in ADDR_TYPES:
static_routes_input = {
"r3": {
"static_routes": [
{
"network": [NETWORK1_1[addr_type]] + [NETWORK1_2[addr_type]],
"next_hop": NEXT_HOP_IP[addr_type],
"vrf": "RED",
},
{
"network": [NETWORK2_1[addr_type]] + [NETWORK2_2[addr_type]],
"next_hop": NEXT_HOP_IP[addr_type],
"vrf": "RED",
},
{
"network": [NETWORK3_1[addr_type]] + [NETWORK3_2[addr_type]],
"next_hop": NEXT_HOP_IP[addr_type],
"vrf": "RED",
},
{
"network": [NETWORK4_1[addr_type]] + [NETWORK4_2[addr_type]],
"next_hop": NEXT_HOP_IP[addr_type],
"vrf": "RED",
},
{
"network": [NETWORK5_1[addr_type]] + [NETWORK5_2[addr_type]],
"next_hop": NEXT_HOP_IP[addr_type],
"vrf": "RED",
},
]
}
}
dut = "r2"
result = verify_bgp_rib(tgen, addr_type, dut, static_routes_input)
assert result is True, "Testcase {} :Failed \n Error {}".format(tc_name, result)
step("Verify the static Routes in R1 on RED VRF")
for addr_type in ADDR_TYPES:
static_routes_input = {
"r3": {
"static_routes": [
{
"network": [NETWORK1_1[addr_type]] + [NETWORK1_2[addr_type]],
"next_hop": NEXT_HOP_IP[addr_type],
"vrf": "RED",
},
{
"network": [NETWORK2_1[addr_type]] + [NETWORK2_2[addr_type]],
"next_hop": NEXT_HOP_IP[addr_type],
"vrf": "RED",
},
{
"network": [NETWORK3_1[addr_type]] + [NETWORK3_2[addr_type]],
"next_hop": NEXT_HOP_IP[addr_type],
"vrf": "RED",
},
{
"network": [NETWORK4_1[addr_type]] + [NETWORK4_2[addr_type]],
"next_hop": NEXT_HOP_IP[addr_type],
"vrf": "RED",
},
{
"network": [NETWORK5_1[addr_type]] + [NETWORK5_2[addr_type]],
"next_hop": NEXT_HOP_IP[addr_type],
"vrf": "RED",
},
]
}
}
dut = "r1"
result = verify_bgp_rib(tgen, addr_type, dut, static_routes_input)
assert result is True, "Testcase {} :Failed \n Error {}".format(tc_name, result)
step("Enabling tcp-mss 150 on Router R1 in VRF RED")
TCP_MSS = 150
raw_config = {
"r1": {
"raw_config": [
"router bgp {} vrf {}".format(
topo["routers"]["r1"]["bgp"][0]["local_as"],
topo["routers"]["r1"]["bgp"][0]["vrf"],
),
"neighbor {} tcp-mss {}".format(
topo["routers"]["r2"]["links"]["r1-link1"]["ipv4"].split("/")[0],
TCP_MSS,
),
"neighbor {} tcp-mss {}".format(
topo["routers"]["r2"]["links"]["r1-link1"]["ipv6"].split("/")[0],
TCP_MSS,
),
]
},
}
result = apply_raw_config(tgen, raw_config)
assert result is True, "Testcase {} : Failed Error: {}".format(tc_name, result)
step("Clearing BGP on R1 and R2 ")
for addr_type in ADDR_TYPES:
clear_bgp(tgen, addr_type, "r1", vrf=topo["routers"]["r1"]["bgp"][0]["vrf"])
clear_bgp(tgen, addr_type, "r2", vrf=topo["routers"]["r2"]["bgp"][1]["vrf"])
step("Verify the BGP Convergence at R1 & R2 after Clear BGP")
r1_convergence = verify_bgp_convergence(tgen, topo, dut="r1")
assert (
r1_convergence is True
), "BGP convergence after Clear BGP :Failed \n Error: {}".format(r1_convergence)
r2_convergence = verify_bgp_convergence(tgen, topo, dut="r2")
assert (
r2_convergence is True
), "BGP convergence after Clear BGP :Failed \n Error: {}".format(r2_convergence)
step("Verify the TCP-MSS value on both Router R1 and R2")
for addr_type in ADDR_TYPES:
dut = "r1"
tcp_mss_result = verify_tcp_mss(
tgen,
dut,
topo["routers"]["r2"]["links"]["r1-link1"][addr_type].split("/")[0],
TCP_MSS,
"RED",
)
assert tcp_mss_result is True, " TCP-MSS mismatch :Failed \n Error: {}".format(
tcp_mss_result
)
step("Enabling tcp-mss 500 between R2 and R3 of VRF Default")
TCP_MSS = 500
raw_config = {
"r2": {
"raw_config": [
"router bgp {} ".format(topo["routers"]["r2"]["bgp"][0]["local_as"]),
"neighbor {} tcp-mss {}".format(
topo["routers"]["r3"]["links"]["r2-link1"]["ipv4"].split("/")[0],
TCP_MSS,
),
"neighbor {} tcp-mss {}".format(
topo["routers"]["r3"]["links"]["r2-link1"]["ipv6"].split("/")[0],
TCP_MSS,
),
]
},
"r3": {
"raw_config": [
"router bgp {} ".format(topo["routers"]["r3"]["bgp"][0]["local_as"]),
"neighbor {} tcp-mss {}".format(
topo["routers"]["r2"]["links"]["r3-link1"]["ipv4"].split("/")[0],
TCP_MSS,
),
"neighbor {} tcp-mss {}".format(
topo["routers"]["r2"]["links"]["r3-link1"]["ipv6"].split("/")[0],
TCP_MSS,
),
]
},
}
result = apply_raw_config(tgen, raw_config)
assert result is True, "Testcase {} : Failed Error: {}".format(tc_name, result)
step("Clear BGP at router R2 and R3")
for addr_type in ADDR_TYPES:
clear_bgp(tgen, topo, "r2", addr_type)
clear_bgp(tgen, topo, "r3", addr_type)
step("Verify the BGP Convergence at R2 & R3 after Clear BGP")
r1_convergence = verify_bgp_convergence(tgen, topo, dut="r2")
assert (
r1_convergence is True
), "BGP convergence after Clear BGP :Failed \n Error: {}".format(r2_convergence)
r2_convergence = verify_bgp_convergence(tgen, topo, dut="r3")
assert (
r2_convergence is True
), "BGP convergence after Clear BGP :Failed \n Error: {}".format(r2_convergence)
step("Verify the TCP-MSS value on both Router R2 and R3")
for addr_type in ADDR_TYPES:
dut = "r2"
tcp_mss_result = verify_tcp_mss(
tgen,
dut,
topo["routers"]["r3"]["links"]["r2-link1"]["ipv4"].split("/")[0],
TCP_MSS,
)
assert tcp_mss_result is True, " TCP-MSS mismatch :Failed \n Error: {}".format(
tcp_mss_result
)
dut = "r3"
tcp_mss_result = verify_tcp_mss(
tgen,
dut,
topo["routers"]["r2"]["links"]["r3-link1"]["ipv4"].split("/")[0],
TCP_MSS,
)
assert tcp_mss_result is True, " TCP-MSS mismatch :Failed \n Error: {}".format(
tcp_mss_result
)
step("Removing tcp-mss 150 between R1 and R2 of VRF RED ")
TCP_MSS = 150
raw_config = {
"r1": {
"raw_config": [
"router bgp {} vrf {}".format(
topo["routers"]["r1"]["bgp"][0]["local_as"],
topo["routers"]["r1"]["bgp"][0]["vrf"],
),
"no neighbor {} tcp-mss {}".format(
topo["routers"]["r2"]["links"]["r1-link1"]["ipv4"].split("/")[0],
TCP_MSS,
),
"no neighbor {} tcp-mss {}".format(
topo["routers"]["r2"]["links"]["r1-link1"]["ipv6"].split("/")[0],
TCP_MSS,
),
]
}
}
result = apply_raw_config(tgen, raw_config)
assert result is True, "Testcase {} : Failed Error: {}".format(tc_name, result)
raw_config = {
"r2": {
"raw_config": [
"router bgp {} vrf {}".format(
topo["routers"]["r2"]["bgp"][0]["local_as"],
topo["routers"]["r2"]["bgp"][1]["vrf"],
),
"no neighbor {} tcp-mss {}".format(
topo["routers"]["r1"]["links"]["r2-link1"]["ipv4"].split("/")[0],
TCP_MSS,
),
"no neighbor {} tcp-mss {}".format(
topo["routers"]["r1"]["links"]["r2-link1"]["ipv6"].split("/")[0],
TCP_MSS,
),
]
}
}
result = apply_raw_config(tgen, raw_config)
assert result is True, "Testcase {} : Failed Error: {}".format(tc_name, result)
step("Verify the TCP-MSS value cleared on both Router R1 and R2")
for addr_type in ADDR_TYPES:
dut = "r1"
tcp_mss_result = verify_tcp_mss(
tgen,
dut,
topo["routers"]["r2"]["links"]["r1-link1"][addr_type].split("/")[0],
TCP_MSS,
"RED",
)
assert (
tcp_mss_result is not True
), " TCP-MSS mismatch :Failed \n Error: {}".format(tcp_mss_result)
dut = "r2"
tcp_mss_result = verify_tcp_mss(
tgen,
dut,
topo["routers"]["r1"]["links"]["r2-link1"]["ipv4"].split("/")[0],
TCP_MSS,
"RED",
)
assert (
tcp_mss_result is not True
), " TCP-MSS mismatch :Failed \n Error: {}".format(tcp_mss_result)
step("Removing tcp-mss 500 between R2 and R3 of VRF Default ")
TCP_MSS = 500
raw_config = {
"r2": {
"raw_config": [
"router bgp {} ".format(topo["routers"]["r2"]["bgp"][0]["local_as"]),
"no neighbor {} tcp-mss {}".format(
topo["routers"]["r3"]["links"]["r2-link1"]["ipv4"].split("/")[0],
TCP_MSS,
),
"no neighbor {} tcp-mss {}".format(
topo["routers"]["r3"]["links"]["r2-link1"]["ipv6"].split("/")[0],
TCP_MSS,
),
]
}
}
result = apply_raw_config(tgen, raw_config)
assert result is True, "Testcase {} : Failed Error: {}".format(tc_name, result)
raw_config = {
"r3": {
"raw_config": [
"router bgp {} ".format(topo["routers"]["r3"]["bgp"][0]["local_as"]),
"no neighbor {} tcp-mss {}".format(
topo["routers"]["r2"]["links"]["r3-link1"]["ipv4"].split("/")[0],
TCP_MSS,
),
"no neighbor {} tcp-mss {}".format(
topo["routers"]["r2"]["links"]["r3-link1"]["ipv6"].split("/")[0],
TCP_MSS,
),
]
}
}
result = apply_raw_config(tgen, raw_config)
assert result is True, "Testcase {} : Failed Error: {}".format(tc_name, result)
step("Verify the TCP-MSS value got cleared on both Router R2 and R3")
for addr_type in ADDR_TYPES:
dut = "r2"
tcp_mss_result = verify_tcp_mss(
tgen,
dut,
topo["routers"]["r3"]["links"]["r2-link1"]["ipv4"].split("/")[0],
TCP_MSS,
)
assert (
tcp_mss_result is not True
), " TCP-MSS mismatch :Failed \n Error: {}".format(tcp_mss_result)
dut = "r3"
tcp_mss_result = verify_tcp_mss(
tgen,
dut,
topo["routers"]["r2"]["links"]["r3-link1"]["ipv4"].split("/")[0],
TCP_MSS,
)
assert (
tcp_mss_result is not True
), " TCP-MSS mismatch :Failed \n Error: {}".format(tcp_mss_result)
step("Configuring different TCP-MSS R2 and R3 ")
TCP_MSS = 500
raw_config = {
"r2": {
"raw_config": [
"router bgp {}".format(topo["routers"]["r2"]["bgp"][0]["local_as"]),
"neighbor {} tcp-mss {}".format(
topo["routers"]["r3"]["links"]["r2-link1"]["ipv4"].split("/")[0],
TCP_MSS,
),
"neighbor {} tcp-mss {}".format(
topo["routers"]["r3"]["links"]["r2-link1"]["ipv6"].split("/")[0],
TCP_MSS,
),
]
}
}
result = apply_raw_config(tgen, raw_config)
assert result is True, "Testcase {} : Failed Error: {}".format(tc_name, result)
TCP_MSS = 300
raw_config = {
"r3": {
"raw_config": [
"router bgp {} ".format(topo["routers"]["r3"]["bgp"][0]["local_as"]),
"neighbor {} tcp-mss {}".format(
topo["routers"]["r2"]["links"]["r3-link1"]["ipv4"].split("/")[0],
TCP_MSS,
),
"neighbor {} tcp-mss {}".format(
topo["routers"]["r2"]["links"]["r3-link1"]["ipv6"].split("/")[0],
TCP_MSS,
),
]
}
}
result = apply_raw_config(tgen, raw_config)
assert result is True, "Testcase {} : Failed Error: {}".format(tc_name, result)
step("Verify the TCP-MSS value on both Router R2 and R3")
for addr_type in ADDR_TYPES:
TCP_MSS = 500
dut = "r2"
tcp_mss_result = verify_tcp_mss(
tgen,
dut,
topo["routers"]["r3"]["links"]["r2-link1"]["ipv4"].split("/")[0],
TCP_MSS,
)
assert tcp_mss_result is True, " TCP-MSS mismatch :Failed \n Error: {}".format(
tcp_mss_result
)
TCP_MSS = 300
dut = "r3"
tcp_mss_result = verify_tcp_mss(
tgen,
dut,
topo["routers"]["r2"]["links"]["r3-link1"]["ipv4"].split("/")[0],
TCP_MSS,
)
assert tcp_mss_result is True, " TCP-MSS mismatch :Failed \n Error: {}".format(
tcp_mss_result
)
step("Configure TCP_MSS > MTU on R2 and R3 and it should be 1460 ")
TCP_MSS = 4096
REF_TCP_MSS = 1460
raw_config = {
"r2": {
"raw_config": [
"router bgp {} ".format(topo["routers"]["r2"]["bgp"][0]["local_as"]),
"neighbor {} tcp-mss {}".format(
topo["routers"]["r3"]["links"]["r2-link1"]["ipv4"].split("/")[0],
TCP_MSS,
),
"neighbor {} tcp-mss {}".format(
topo["routers"]["r3"]["links"]["r2-link1"]["ipv6"].split("/")[0],
TCP_MSS,
),
]
}
}
result = apply_raw_config(tgen, raw_config)
assert result is True, "Testcase {} : Failed Error: {}".format(tc_name, result)
raw_config = {
"r3": {
"raw_config": [
"router bgp {} ".format(topo["routers"]["r3"]["bgp"][0]["local_as"]),
"neighbor {} tcp-mss {}".format(
topo["routers"]["r2"]["links"]["r3-link1"]["ipv4"].split("/")[0],
TCP_MSS,
),
"neighbor {} tcp-mss {}".format(
topo["routers"]["r2"]["links"]["r3-link1"]["ipv6"].split("/")[0],
TCP_MSS,
),
]
}
}
result = apply_raw_config(tgen, raw_config)
assert result is True, "Testcase {} : Failed Error: {}".format(tc_name, result)
step("Restarting BGP Daemon on R3")
kill_router_daemons(tgen, "r3", ["bgpd"])
start_router_daemons(tgen, "r3", ["bgpd"])
step(
"Verify the configured TCP-MSS 4096 value on restarting both Daemon both Router R2 and R3 "
)
for addr_type in ADDR_TYPES:
TCP_MSS = 4096
dut = "r2"
tcp_mss_result = verify_tcp_mss(
tgen,
dut,
topo["routers"]["r3"]["links"]["r2-link1"]["ipv4"].split("/")[0],
TCP_MSS,
)
assert tcp_mss_result is True, " TCP-MSS mismatch :Failed \n Error: {}".format(
tcp_mss_result
)
dut = "r3"
tcp_mss_result = verify_tcp_mss(
tgen,
dut,
topo["routers"]["r2"]["links"]["r3-link1"]["ipv4"].split("/")[0],
TCP_MSS,
)
assert tcp_mss_result is True, " TCP-MSS mismatch :Failed \n Error: {}".format(
tcp_mss_result
)
write_test_footer(tc_name)
if __name__ == "__main__":
args = ["-s"] + sys.argv[1:]
sys.exit(pytest.main(args))

53
tests/topotests/lib/bgp.py
View File

@ -4428,3 +4428,56 @@ def verify_evpn_routes(
logger.debug("Exiting lib API: {}".format(sys._getframe().f_code.co_name))
return False
def verify_tcp_mss(tgen, dut, neighbour, configured_tcp_mss, vrf=None):
"""
This api is used to verify the tcp-mss value assigned to a neigbour of DUT
Parameters
----------
* `tgen` : topogen object
* `dut`: device under test
* `neighbour`:neigbout IP address
* `configured_tcp_mss`:The TCP-MSS value to be verified
* `vrf`:vrf
Usage
-----
result = verify_tcp_mss(tgen, dut,neighbour,configured_tcp_mss)
Returns
-------
errormsg(str) or True
"""
logger.debug("Entering lib API: {}".format(sys._getframe().f_code.co_name))
rnode = tgen.routers()[dut]
if vrf:
cmd = "show bgp vrf {} neighbors {} json".format(vrf, neighbour)
else:
cmd = "show bgp neighbors {} json".format(neighbour)
# Execute the command
show_vrf_stats = run_frr_cmd(rnode, cmd, isjson=True)
# Verify TCP-MSS on router
logger.info("Verify that no core is observed")
if tgen.routers_have_failure():
errormsg = "Core observed while running CLI: %s" % (cmd)
return errormsg
else:
if configured_tcp_mss == show_vrf_stats.get(neighbour).get(
"bgpTcpMssConfigured"
):
logger.debug(
"Configured TCP - MSS Found: {}".format(sys._getframe().f_code.co_name)
)
return True
else:
logger.debug(
"TCP-MSS Mismatch ,configured {} expecting {}".format(
show_vrf_stats.get(neighbour).get("bgpTcpMssConfigured"),
configured_tcp_mss,
)
)
return "TCP-MSS Mismatch"
logger.debug("Exiting lib API: {}".format(sys._getframe().f_code.co_name))
return False