Architecture de Réseaux Travaux Pratiques AfNOG 2009 About fundamental, why ISP are build like that, this is why ? Prendre du recul How many of you are for ISP Layer upon layer

TP CONCEPTION DE RESEAU

Design INTERNET Core Backbone Routers Noyau 1 Noyau 2 SW 2 SW 1 Table 1 Table 2 Table x Table33 Lignes louées PST/ISDN

Adresses a utiliser pour les interfaces Ethernet Connectez les interfaces de votre routeur sur chacun des switch (e0/0 sur sw1 et e0/1 vers sw2 Adresses a utiliser pour les interfaces Ethernet Sw1: 196.200.221.0/28 (3-14) Sw2: 196.200.221.16/28(19-30) Configurez le loopback 196.200.221.24x/32 Activer OSPF sur votre routeur avec authentification Injectez les préfixes de loopback et de vos connexions Ethernet dans OSPF Les routeurs du Noyau injectent du default Quels sont les préfixes disponibles dans OSPF? Faire des traceroute vers les loopback et vers Internet a partir de vos routeurs Simulez des pannes de switch et de routeur

TP HSRP

Agenda HSRP- 1 groupe HSRP- 2 groupes Tracking interface Technologie Agenda HSRP- 1 groupe HSRP- 2 groupes Tracking interface Pre-empt delay

Topologie Physique Technologie PC Group impair Hub Router Group impair Router Internet Router Group pair E0/1 Hub E0/0 PC Group pair

Adressage IP Technologie Groupe impair : 196.200.221.0/26 .1 .3 Backbone Router fantome 1 HSRP 196.200.221.4 Router fantome 2 HSRP 196.200.221.5 .2 .6

Routage Technologie Default route : 196.200.221.4

HSRP – 1 Router Group Router Groupe impair : actif Technologie HSRP – 1 Router Group Router Group #1 Router Groupe impair : actif Router Groupe pair : stanby Primary Standby

HSRP – 2 Router Group Technologie Router Group #1 Router Group #2 Primary Standby Standby Primary Router Group #2

Routage Technologie Default route : 84.201.64.4

HSRP – Tracking interface Technologie HSRP – Tracking interface Router Group #1 Tracking interface Eth0/1 Debrancher Eth0/1 Primary Eth1 Standby

HSRP - configuration Technologie Router1: interface ethernet 0/0 description LAN serveur ip address 196.200.221.3 255.255.255.192 standby 10 ip 196.200.221.4 standby 10 track ethernet0/1 standby 11 priority 150 standby 11 preempt standby 11 ip 196.200.221.5 standby 11 track ethernet0/1 Seems obvious, but the physical routers represented by the virtual router should lead to the same networks. They should be redundant router in parallel. Here, router 2 is the primary because its priority is higher than the default of 100 If S0 fails – since it is being tracked – then the priority drops to 90, making router 1 the primary R1 should probably track S0 as well If S0 comes back on R2, it takes over again after the preempt delay of 10 seconds “standby timers msec <20-1000>” added for the navy, because even 3 seconds can be a long time if you are tracking an incoming MIG.

HSRP - configuration Technologie Router2: interface ethernet 0/0 description LAN serveur ip address 196.200.221.6 255.255.255.192 standby 10 priority 150 standby 10 preempt standby 10 ip 196.200.221.4 standby 10 track ethernet0/1 standby 11 ip 196.200.221.5 standby 11 track ethernet0/1 Seems obvious, but the physical routers represented by the virtual router should lead to the same networks. They should be redundant router in parallel. Here, router 2 is the primary because its priority is higher than the default of 100 If S0 fails – since it is being tracked – then the priority drops to 90, making router 1 the primary R1 should probably track S0 as well If S0 comes back on R2, it takes over again after the preempt delay of 10 seconds “standby timers msec <20-1000>” added for the navy, because even 3 seconds can be a long time if you are tracking an incoming MIG.