VLANs (vtp/ trunking) Flashcards

1
Q

vlans disponiveis

A

sao utilizados 12 bits p identificar uma vlan (frame tagging)x
1-4094 vlans possiveis
vlan 0, 1002-1005 sao reservadas
1006-4094 sao VLANS extendidas e so sao possiveis ser utilizadas no modo vtp transparent

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2
Q

modos de negociacao trunk

A
dynamic auto (nao inicia negociacao de trunk)
dynamic desirable (inicia negociacao
trunking (muda a porta para trunk e ainda negocia se o link sera um trunk)
nonnegotiate (previne que uma interface gere frames DTP para negociacao)
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3
Q

controlar as VLANS permitidas em trunks de algumas interfaces

A

switchport trunk allowed vlan [remove/add/all] X,Y,Z

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4
Q

mostra os dados de trunk/acesso operacao, encapsulamento, negociacao de uma interface

A

show interface [X] switchport

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5
Q

portas de acesso e vlan

A

pertencem a uma unica VLAN (na verdade pode rolar de pertencer a uma vlan de voz tb: voice/auxiliary vlan)
removem as informacoes da vlan antes de encaminhar o frame para o destino

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6
Q

verificar as vlans criadas

A

show vlans (so mostra as portas no modo de acesso)
show vlan brief
show vlan X
show vlan id X

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7
Q

configurar um ROAS

A

criar sub-interfaces para cada vlan
identificar qual sub-interface eh a da VLAN nativa (ou a interface sera a da VLAN nativa)
———————-
interface fa0/1.X
encapsulation [isl/dot1q] [X vlan] [native]
ip add x.x.x.x y.y.y.y

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8
Q

verificar o modo vtp de um switch e senha do dominio

A
# show vtp status 
# show vtp password
5 minutos padrao p enviar msgs sobre os links(servers e clients)
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9
Q

alterar a vlan nativa

A

comando de interface

switchport trunk native vlan X

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10
Q

mostrar as portas trunk

A

show interface trunk (modo, encapsulamento, status e vlan nativa de cada interface)

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11
Q

voice vlan

A

CDP deve estar ativado p funcionar
links sao de acesso
IP phones possuem um switch embutido
Voice Vlan tag 802.1q

(config-if) switchport mode access
(config-if) switchport voice vlan X

#show int switchport
#show int trunk
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12
Q

configurar vtp

A
vtp mode [client/server/transparent]
vtp domain [X]
vtp password [X]
vtp version [1=2,3]
vtp pruning

para o modo transparent passar msgs a versao deve ser a msma

versao 1 e 2 nao apresentam diferencas significativas

msgs a cada 5 min (broadcast)

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13
Q

onde sao armazenadas as configuracoes do vtp

A

client e server modes:

vtp.dat na FLASH

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14
Q

problemas ao adicionar um novo switch

A

numero de revisao alto (independentemente de ser cliente/servidor)

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