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https://github.com/FRRouting/frr.git
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tests/topotests: Added basic test for disable-establish-hello ldpd option
Test runs ldpd on 3 routers with and without option. Iptables is used to count LDP hello messages. Signed-off-by: Andrii Melnychenko <a.melnychenko@vyos.io>
This commit is contained in:
Andrii Melnychenko
parent
7bc20bd767
commit
90084d21e0
21
tests/topotests/ldp_establish_hello_topo1/r1/ldpd.conf
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tests/topotests/ldp_establish_hello_topo1/r1/ldpd.conf
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hostname r1
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log file ldpd.log
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!
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! debug mpls ldp zebra
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! debug mpls ldp event
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! debug mpls ldp errors
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! debug mpls ldp messages recv
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! debug mpls ldp messages sent
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! debug mpls ldp discovery hello recv
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! debug mpls ldp discovery hello sent
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!
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mpls ldp
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router-id 1.1.1.1
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!
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address-family ipv4
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discovery transport-address 1.1.1.1
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!
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!
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!
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line vty
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!
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tests/topotests/ldp_establish_hello_topo1/r1/zebra.conf
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tests/topotests/ldp_establish_hello_topo1/r1/zebra.conf
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log file zebra.log
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!
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hostname r1
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!
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interface lo
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ip address 1.1.1.1/32
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!
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interface r1-eth0
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description to sw0
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ip address 10.0.1.1/24
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no link-detect
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!
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ip forwarding
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!
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!
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line vty
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!
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21
tests/topotests/ldp_establish_hello_topo1/r2/ldpd.conf
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tests/topotests/ldp_establish_hello_topo1/r2/ldpd.conf
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hostname r2
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log file ldpd.log
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!
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! debug mpls ldp zebra
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! debug mpls ldp event
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! debug mpls ldp errors
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! debug mpls ldp messages recv
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! debug mpls ldp messages sent
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! debug mpls ldp discovery hello recv
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! debug mpls ldp discovery hello sent
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!
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mpls ldp
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router-id 2.2.2.2
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!
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address-family ipv4
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discovery transport-address 2.2.2.2
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!
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!
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!
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line vty
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!
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17
tests/topotests/ldp_establish_hello_topo1/r2/zebra.conf
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tests/topotests/ldp_establish_hello_topo1/r2/zebra.conf
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log file zebra.log
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!
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hostname r2
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!
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interface lo
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ip address 2.2.2.2/32
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!
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interface r2-eth0
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description to sw0
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ip address 10.0.1.2/24
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no link-detect
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!
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ip forwarding
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!
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!
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line vty
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!
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21
tests/topotests/ldp_establish_hello_topo1/r3/ldpd.conf
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tests/topotests/ldp_establish_hello_topo1/r3/ldpd.conf
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hostname r3
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log file ldpd.log
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!
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! debug mpls ldp zebra
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! debug mpls ldp event
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! debug mpls ldp errors
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! debug mpls ldp messages recv
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! debug mpls ldp messages sent
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! debug mpls ldp discovery hello recv
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! debug mpls ldp discovery hello sent
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!
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mpls ldp
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router-id 3.3.3.3
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!
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address-family ipv4
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discovery transport-address 3.3.3.3
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!
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!
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!
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line vty
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!
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17
tests/topotests/ldp_establish_hello_topo1/r3/zebra.conf
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tests/topotests/ldp_establish_hello_topo1/r3/zebra.conf
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log file zebra.log
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!
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hostname r3
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!
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interface lo
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ip address 3.3.3.3/32
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!
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interface r3-eth0
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description to sw0
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ip address 10.0.1.3/24
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no link-detect
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!
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ip forwarding
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!
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!
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line vty
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!
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## Color coding:
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#########################
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## Main FRR: #f08080 red
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## Switches: #d0e0d0 gray
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## RIP: #19e3d9 Cyan
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## RIPng: #fcb314 dark yellow
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## OSPFv2: #32b835 Green
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## OSPFv3: #19e3d9 Cyan
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## ISIS IPv4 #fcb314 dark yellow
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## ISIS IPv6 #9a81ec purple
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## BGP IPv4 #eee3d3 beige
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## BGP IPv6 #fdff00 yellow
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##### Colors (see http://www.color-hex.com/)
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graph template {
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label="Test Topology - LDP-ESTABLISH-HELLO 1";
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# Routers
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r1 [
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shape=doubleoctagon,
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label="1.1.1.1",
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fillcolor="#f08080",
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style=filled,
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];
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r2 [
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shape=doubleoctagon
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label="2.2.2.2",
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fillcolor="#f08080",
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style=filled,
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];
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r3 [
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shape=doubleoctagon
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label="3.3.3.3",
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fillcolor="#f08080",
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style=filled,
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];
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# Switches
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sw0 [
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shape=oval,
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label="10.0.1.0/24",
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fillcolor="#d0e0d0",
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style=filled,
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];
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# Connections
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r1 -- sw0 [label="r1-eth0"];
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r2 -- sw0 [label="r2-eth0"];
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r3 -- sw0 [label="r3-eth0"];
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}
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#!/usr/bin/env python
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# SPDX-License-Identifier: ISC
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#
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# test_establish_hello_topo1.py
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#
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# Copyright (c) 2025 by VyOS Networks
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# Andrii Melnychenko (a.melnychenko@vyos.io)
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#
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r"""
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test_establish_hello_topo1.py: Simple FRR LDP Test
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+-------------+
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| r1 |
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| 1.1.1.1 |
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+-------------+
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| .1 r1-eth0
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+---------+ ~~~~~~~~~~~~~
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| r2 | .2 r2-eth0 ~~ sw0 ~~
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| 2.2.2.2 | ------------- ~~ 10.0.1.0/24 ~~
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+---------+ ~~~~~~~~~~~~~
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| .3 r3-eth0
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+-------------+
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| r3 |
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| 3.3.3.3 |
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+-------------+
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"""
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import os
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import re
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import sys
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import pytest
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from time import sleep
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from lib.topogen import Topogen, get_topogen
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fatal_error = ""
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pytestmark = [pytest.mark.ldpd]
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def build_topo(tgen):
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# Setup Routers
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for router in ["r1", "r2", "r3"]:
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tgen.add_router(router)
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# Switch
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switch = tgen.add_switch("sw0")
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switch.add_link(tgen.gears["r1"])
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switch.add_link(tgen.gears["r2"])
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switch.add_link(tgen.gears["r3"])
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def setup_module(module):
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thisDir = os.path.dirname(os.path.realpath(__file__))
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tgen = Topogen(build_topo, module.__name__)
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tgen.start_topology()
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net = tgen.net
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# Starting Routers
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for router in ["r1", "r2", "r3"]:
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net[router].loadConf("zebra", "%s/%s/zebra.conf" % (thisDir, router))
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net[router].loadConf("ldpd", "%s/%s/ldpd.conf" % (thisDir, router))
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tgen.gears[router].start()
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# For debugging after starting FRR daemons, uncomment the next line
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# tgen.mininet_cli()
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def teardown_module(module):
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tgen = get_topogen()
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tgen.stop_topology()
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def test_default_behaviour():
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global fatal_error
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# Skip if previous fatal error condition is raised
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if fatal_error != "":
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pytest.skip(fatal_error)
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tgen = get_topogen()
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# Setup counters
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tgen.gears["r3"].run("""
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iptables -t filter -A INPUT -s 10.0.1.1 -p udp --dport 646 -j ACCEPT
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iptables -t filter -A INPUT -s 10.0.1.2 -p udp --dport 646 -j ACCEPT
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iptables -t filter -A OUTPUT -s 10.0.1.3 -p udp --dport 646 -j ACCEPT
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""")
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# Setup the LDP service
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for router in ["r3", "r2", "r1"]:
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tgen.gears[router].vtysh_multicmd([
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"configure terminal",
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"mpls ldp",
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"address-family ipv4",
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f"interface {router}-eth0",
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"end"])
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sleep(7)
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# Get values from counters
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output = tgen.gears["r3"].run("iptables -t filter -L -v -n")
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# Disable the LDP service
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for router in ["r3", "r2", "r1"]:
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tgen.gears[router].vtysh_multicmd([
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"configure terminal",
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"mpls ldp",
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"address-family ipv4",
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f"no interface {router}-eth0",
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"end"])
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# Remove counter
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tgen.gears["r3"].run("iptables -t filter -F")
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pattern = r"\n\s+(\d+)"
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matches = re.findall(pattern, output)
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# Each router should send at least 2 packets of LDP hello,
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# one at the start and one after the "interval"(default 5 sec)
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# So, router 10.0.1.1(1.1.1.1) should send only 2 packets
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# Router 10.0.1.2(2.2.2.2) sent 2 packets plus 2 packets for each attempt to connect to the 1.1.1.1 - in total 4
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# Router 10.0.1.3(3.3.3.3) sent 2 packets plus 2 packets to the 1.1.1.1 and 4 packets to the 2.2.2.2 - in total 8
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assert matches == ['2', '4', '8'], "Wrong count of the LDP hello messages"
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def test_disable_establish_hello():
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global fatal_error
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# Skip if previous fatal error condition is raised
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if fatal_error != "":
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pytest.skip(fatal_error)
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tgen = get_topogen()
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# Setup counters
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tgen.gears["r3"].run("""
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iptables -t filter -A INPUT -s 10.0.1.1 -p udp --dport 646 -j ACCEPT
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iptables -t filter -A INPUT -s 10.0.1.2 -p udp --dport 646 -j ACCEPT
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iptables -t filter -A OUTPUT -s 10.0.1.3 -p udp --dport 646 -j ACCEPT
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""")
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# Setup the LDP service with disable-establish-hello option
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for router in ["r3", "r2", "r1"]:
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tgen.gears[router].vtysh_multicmd([
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"configure terminal",
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"mpls ldp",
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"address-family ipv4",
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f"interface {router}-eth0",
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"disable-establish-hello",
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"end"])
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sleep(7)
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# Get values from counters
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output = tgen.gears["r3"].run("iptables -t filter -L -v -n")
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# Disable the LDP service
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for router in ["r3", "r2", "r1"]:
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tgen.gears[router].vtysh_multicmd([
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"configure terminal",
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"mpls ldp",
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"address-family ipv4",
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f"no interface {router}-eth0",
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"end"])
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# Remove counter
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tgen.gears["r3"].run("iptables -t filter -F")
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pattern = r"\n\s+(\d+)"
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matches = re.findall(pattern, output)
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# With disabled sending LDP hello message on attempt to establish TCP connection
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# Each router should only send 2 packets, at start and after 5 seconds(default interval)
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assert matches == ['2', '2', '2'], "Wrong count of the LDP hello messages"
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if __name__ == "__main__":
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# To suppress tracebacks, either use the following pytest call or add "--tb=no" to cli
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# retval = pytest.main(["-s", "--tb=no"])
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retval = pytest.main(["-s"])
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sys.exit(retval)
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