\n\n\n\n
![\"\"](\"http:\/\/192.168.20.20\/wp-content\/uploads\/2026\/05\/d16edd68-85b0-4883-aabf-6d3a85a7fe06-1024x683.png\")
<\/figure>\n\n\n\nConfiguration compl\u00e8te<\/h3>\n\n\n\n#############################################
# CONFIGURATION COMMUNE (ROUTEUR & SWITCH)
#############################################
enable
configure terminal
hostname SECURE-EQUIP
! Mot de passe privil\u00e9gi\u00e9
enable secret <PASSWORD>
! Chiffrement des mots de passe
service password-encryption
! Banni\u00e8re l\u00e9gale
banner motd #
ACCES RESERVE - TOUT ACCES NON AUTORISE EST INTERDIT
#
! Utilisateur local
username admin privilege 15 secret <PASSWORD>
! Console
line console 0
login local
exec-timeout 5 0
logging synchronous
! Acc\u00e8s distant SSH
no ip domain-lookup
ip domain-name breizh.local
crypto key generate rsa modulus 2048
ip ssh version 2
line vty 0 4
transport input ssh
login local
exec-timeout 5 0
! Protection brute force
login block-for 60 attempts 3 within 60
end
write memory
#############################################
# SECURISATION SWITCH
#############################################
configure terminal
! D\u00e9sactivation ports inutilis\u00e9s
interface range fa0\/10 - 24
shutdown
! S\u00e9curisation ports utilisateurs
interface range fa0\/1 - 9
switchport mode access
switchport port-security
switchport port-security maximum 2
switchport port-security violation restrict
switchport port-security mac-address sticky
spanning-tree portfast
spanning-tree bpduguard enable
end
write memory
#############################################
# SECURISATION ROUTEUR
#############################################
configure terminal
! D\u00e9sactivation services inutiles
no ip http server
no ip http secure-server
! R\u00e9duction surface d\u2019attaque
no cdp run
! Logs
logging buffered 4096
end
write memory<\/code><\/pre>\n\n\n\n
\n\n\n\nExplication<\/h3>\n\n\n\n
Acc\u00e8s administrateur
Le mot de passe enable secret<\/code> prot\u00e8ge l\u2019acc\u00e8s au mode privil\u00e9gi\u00e9.
Le compte local permet une authentification s\u00e9curis\u00e9e.<\/p>\n\n\n\nAcc\u00e8s distant
Seul SSH est autoris\u00e9. Telnet est exclu car non chiffr\u00e9.
Une cl\u00e9 RSA est n\u00e9cessaire pour activer SSH.<\/p>\n\n\n\n
Protection des acc\u00e8s
La commande login block-for<\/code> limite les tentatives de connexion.
Le exec-timeout<\/code> ferme automatiquement les sessions inactives.<\/p>\n\n\n\nConsole
L\u2019acc\u00e8s console est prot\u00e9g\u00e9 avec authentification locale.<\/p>\n\n\n\n
Switch \u2013 s\u00e9curisation des ports
Le port-security limite le nombre d\u2019\u00e9quipements par port.
Le mode sticky enregistre automatiquement les adresses MAC autoris\u00e9es.
La violation en mode restrict bloque les acc\u00e8s non autoris\u00e9s.<\/p>\n\n\n\n
Protection couche 2
PortFast acc\u00e9l\u00e8re l\u2019activation des ports utilisateurs.
BPDU Guard prot\u00e8ge contre les attaques via un switch non autoris\u00e9.<\/p>\n\n\n\n
Ports inutilis\u00e9s
Les ports non utilis\u00e9s sont d\u00e9sactiv\u00e9s pour \u00e9viter toute connexion non contr\u00f4l\u00e9e.<\/p>\n\n\n\n
Routeur \u2013 r\u00e9duction de surface d\u2019attaque
Les services HTTP et HTTPS sont d\u00e9sactiv\u00e9s.
CDP est d\u00e9sactiv\u00e9 pour \u00e9viter l\u2019exposition d\u2019informations r\u00e9seau.<\/p>\n\n\n\n
Logs
Les \u00e9v\u00e9nements sont enregistr\u00e9s pour permettre un suivi et une analyse.<\/p>\n\n\n\n
\n\n\n\nPoints cl\u00e9s<\/h3>\n\n\n\n\n- SSH uniquement<\/li>\n\n\n\n
- comptes locaux obligatoires<\/li>\n\n\n\n
- ports inutilis\u00e9s d\u00e9sactiv\u00e9s<\/li>\n\n\n\n
- port-security actif<\/li>\n\n\n\n
- services inutiles supprim\u00e9s<\/li>\n\n\n\n
- journalisation activ\u00e9e<\/li>\n<\/ul>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
Dans un contexte BTS CIEL ou SIO, la s\u00e9curisation des \u00e9quipements r\u00e9seau est essentielle.Un routeur ou un switch mal configur\u00e9 peut permettre un acc\u00e8s non autoris\u00e9, une modification de configuration ou une interception de trafic. L\u2019objectif est de : Configuration compl\u00e8te Explication Acc\u00e8s administrateurLe mot de passe enable secret prot\u00e8ge l\u2019acc\u00e8s au mode privil\u00e9gi\u00e9.Le compte […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[4,10],"tags":[3],"class_list":["post-34","post","type-post","status-publish","format-standard","hentry","category-cisco","category-reseau","tag-cisco"],"yoast_head":"\n
Fiche S\u00e9curisation de base d\u2019un routeur et d\u2019un switch Cisco - Eryann Breizh SecOps<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/eryann.fr\/index.php\/cisco\/fiche-securisation-de-base-dun-routeur-et-dun-switch-cisco\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Fiche S\u00e9curisation de base d\u2019un routeur et d\u2019un switch Cisco - Eryann Breizh SecOps\" \/>\n<meta property=\"og:description\" content=\"Dans un contexte BTS CIEL ou SIO, la s\u00e9curisation des \u00e9quipements r\u00e9seau est essentielle.Un routeur ou un switch mal configur\u00e9 peut permettre un acc\u00e8s non autoris\u00e9, une modification de configuration ou une interception de trafic. 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#############################################
# CONFIGURATION COMMUNE (ROUTEUR & SWITCH)
#############################################
enable
configure terminal
hostname SECURE-EQUIP
! Mot de passe privil\u00e9gi\u00e9
enable secret <PASSWORD>
! Chiffrement des mots de passe
service password-encryption
! Banni\u00e8re l\u00e9gale
banner motd #
ACCES RESERVE - TOUT ACCES NON AUTORISE EST INTERDIT
#
! Utilisateur local
username admin privilege 15 secret <PASSWORD>
! Console
line console 0
login local
exec-timeout 5 0
logging synchronous
! Acc\u00e8s distant SSH
no ip domain-lookup
ip domain-name breizh.local
crypto key generate rsa modulus 2048
ip ssh version 2
line vty 0 4
transport input ssh
login local
exec-timeout 5 0
! Protection brute force
login block-for 60 attempts 3 within 60
end
write memory
#############################################
# SECURISATION SWITCH
#############################################
configure terminal
! D\u00e9sactivation ports inutilis\u00e9s
interface range fa0\/10 - 24
shutdown
! S\u00e9curisation ports utilisateurs
interface range fa0\/1 - 9
switchport mode access
switchport port-security
switchport port-security maximum 2
switchport port-security violation restrict
switchport port-security mac-address sticky
spanning-tree portfast
spanning-tree bpduguard enable
end
write memory
#############################################
# SECURISATION ROUTEUR
#############################################
configure terminal
! D\u00e9sactivation services inutiles
no ip http server
no ip http secure-server
! R\u00e9duction surface d\u2019attaque
no cdp run
! Logs
logging buffered 4096
end
write memory<\/code><\/pre>\n\n\n\n
\n\n\n\nExplication<\/h3>\n\n\n\n
Acc\u00e8s administrateur
Le mot de passe enable secret<\/code> prot\u00e8ge l\u2019acc\u00e8s au mode privil\u00e9gi\u00e9.
Le compte local permet une authentification s\u00e9curis\u00e9e.<\/p>\n\n\n\nAcc\u00e8s distant
Seul SSH est autoris\u00e9. Telnet est exclu car non chiffr\u00e9.
Une cl\u00e9 RSA est n\u00e9cessaire pour activer SSH.<\/p>\n\n\n\n
Protection des acc\u00e8s
La commande login block-for<\/code> limite les tentatives de connexion.
Le exec-timeout<\/code> ferme automatiquement les sessions inactives.<\/p>\n\n\n\nConsole
L\u2019acc\u00e8s console est prot\u00e9g\u00e9 avec authentification locale.<\/p>\n\n\n\n
Switch \u2013 s\u00e9curisation des ports
Le port-security limite le nombre d\u2019\u00e9quipements par port.
Le mode sticky enregistre automatiquement les adresses MAC autoris\u00e9es.
La violation en mode restrict bloque les acc\u00e8s non autoris\u00e9s.<\/p>\n\n\n\n
Protection couche 2
PortFast acc\u00e9l\u00e8re l\u2019activation des ports utilisateurs.
BPDU Guard prot\u00e8ge contre les attaques via un switch non autoris\u00e9.<\/p>\n\n\n\n
Ports inutilis\u00e9s
Les ports non utilis\u00e9s sont d\u00e9sactiv\u00e9s pour \u00e9viter toute connexion non contr\u00f4l\u00e9e.<\/p>\n\n\n\n
Routeur \u2013 r\u00e9duction de surface d\u2019attaque
Les services HTTP et HTTPS sont d\u00e9sactiv\u00e9s.
CDP est d\u00e9sactiv\u00e9 pour \u00e9viter l\u2019exposition d\u2019informations r\u00e9seau.<\/p>\n\n\n\n
Logs
Les \u00e9v\u00e9nements sont enregistr\u00e9s pour permettre un suivi et une analyse.<\/p>\n\n\n\n
\n\n\n\nPoints cl\u00e9s<\/h3>\n\n\n\n\n- SSH uniquement<\/li>\n\n\n\n
- comptes locaux obligatoires<\/li>\n\n\n\n
- ports inutilis\u00e9s d\u00e9sactiv\u00e9s<\/li>\n\n\n\n
- port-security actif<\/li>\n\n\n\n
- services inutiles supprim\u00e9s<\/li>\n\n\n\n
- journalisation activ\u00e9e<\/li>\n<\/ul>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
Dans un contexte BTS CIEL ou SIO, la s\u00e9curisation des \u00e9quipements r\u00e9seau est essentielle.Un routeur ou un switch mal configur\u00e9 peut permettre un acc\u00e8s non autoris\u00e9, une modification de configuration ou une interception de trafic. L\u2019objectif est de : Configuration compl\u00e8te Explication Acc\u00e8s administrateurLe mot de passe enable secret prot\u00e8ge l\u2019acc\u00e8s au mode privil\u00e9gi\u00e9.Le compte […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[4,10],"tags":[3],"class_list":["post-34","post","type-post","status-publish","format-standard","hentry","category-cisco","category-reseau","tag-cisco"],"yoast_head":"\n
Fiche S\u00e9curisation de base d\u2019un routeur et d\u2019un switch Cisco - Eryann Breizh SecOps<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/eryann.fr\/index.php\/cisco\/fiche-securisation-de-base-dun-routeur-et-dun-switch-cisco\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Fiche S\u00e9curisation de base d\u2019un routeur et d\u2019un switch Cisco - Eryann Breizh SecOps\" \/>\n<meta property=\"og:description\" content=\"Dans un contexte BTS CIEL ou SIO, la s\u00e9curisation des \u00e9quipements r\u00e9seau est essentielle.Un routeur ou un switch mal configur\u00e9 peut permettre un acc\u00e8s non autoris\u00e9, une modification de configuration ou une interception de trafic. 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