3.2.3: Investigació dels enllaços troncals d’una VLAN

Tasca 1: Visualitzar la configuració del switch
Mirem la configuració en execució:

S1#show running-config Building configuration... Current configuration : 2458 bytes ! version 12.2 no service timestamps log datetime msec no service timestamps debug datetime msec no service password-encryption ! hostname S1 ! enable secret 5 $1$gIYy$lNBEKWVIyHziVI2KkDqV// ! no ip domain-lookup ! ! interface FastEthernet0/1 switchport trunk native vlan 99 switchport mode trunk ! interface FastEthernet0/2 switchport access vlan 99 switchport mode access ! interface FastEthernet0/3 switchport trunk native vlan 99 switchport mode trunk ! interface FastEthernet0/4 switchport access vlan 99 switchport mode access ! interface FastEthernet0/5 switchport access vlan 99 switchport mode access ! interface FastEthernet0/6 switchport access vlan 30 switchport mode access ! interface FastEthernet0/7 switchport access vlan 30 switchport mode access ! interface FastEthernet0/8 switchport access vlan 30 switchport mode access ! interface FastEthernet0/9 switchport access vlan 30 switchport mode access ! interface FastEthernet0/10 switchport access vlan 30 switchport mode access ! interface FastEthernet0/11 switchport access vlan 10 switchport mode access ! interface FastEthernet0/12 switchport access vlan 10 switchport mode access ! interface FastEthernet0/13 switchport access vlan 10 switchport mode access ! interface FastEthernet0/14 switchport access vlan 10 switchport mode access ! interface FastEthernet0/15 switchport access vlan 10 switchport mode access ! interface FastEthernet0/16 switchport access vlan 10 switchport mode access ! interface FastEthernet0/17 switchport access vlan 10 switchport mode access ! interface FastEthernet0/18 switchport access vlan 20 switchport mode access ! interface FastEthernet0/19 switchport access vlan 20 switchport mode access ! interface FastEthernet0/20 switchport access vlan 20 switchport mode access ! interface FastEthernet0/21 switchport access vlan 20 switchport mode access ! interface FastEthernet0/22 switchport access vlan 20 switchport mode access ! interface FastEthernet0/23 switchport access vlan 20 switchport mode access ! interface FastEthernet0/24 switchport access vlan 20 switchport mode access ! interface GigabitEthernet1/1 ! interface GigabitEthernet1/2 ! interface Vlan1 no ip address shutdown ! interface Vlan99 ip address 172.17.99.31 255.255.255.0 ! banner motd ^CAUTHORIZED ACCESS ONLY^C ! line con 0 password cisco login ! line vty 0 4 password cisco login line vty 5 15 password cisco login ! ! end
- Quines interfícies estan actualment configurades com a enllaços troncals?
FastEthernet0/3

Tasca 2: Investigar l’etiqueta VLAN
Pas 1: Fer ping de PC1 a PC4
Amb totes les llums en verd, al mode simulació afegim una Simple PDU.

Pas 2: Fer clic en Capture/Forward per observar el ping
Veiem la taula d’esdeveniments:


Pas 3: Investigar els detalls de PDU en un dels switchos
Cliquem a l’esdeveniment del S2 al S1 i mirem la vinyeta Inbound PDU Details:

- Quin es el propòsit dels dos camps que apareixen desprès de l’adreça MAC d’origen?
TPID (Tag Protocol IDentifier): camp de 16bits amb el valor 0x8100 per identificar la capa com a IEEE 802.1Q
TCI (Tag Control Identifier): per indicar la prioritat