<Jeremy's IT Lab> Day18: VLANs(Part 3)

VLANs(Part 3)

 

ROAS

Methods of configuring native VLAN on router:

- Use command encapsulation dot1q vlan-id native on the router subinterface

- Configure IP address for the native VLAN on the router's physical interface (encapsulation... cmd not nessary)

-> router was usded as the PC's gateway

 

Layer3(Multilayer) switches: 

-> capable of both switching and routing

-> Can assign IP addresses to its interfaces (like router)

-> Can create virtual interfaces for each VLAN, assign IP address

-> Can configure routes on it (like router)

-> used for inter-VLAN routing

 

SVI (Switch Virtual Interfaces):

-> virtual interfaces you can assign IP in multilayer switch

-> Configure ecah PC to use SVI as their gateway address

-> Send traffic to different subnets/VLANs, PC will send traffic to the switch and switch routes it

-> when it configured, shutdown is default

 

Inter-VLAN Routing via SVI:

1) VLAN must exist on switch

2) switch must have at least one access port or trunk port allows VLAN up/up state

3) VLAN must not be shut down

4) SVI must not be shut down

 

//CLI

## Inter -VLAN Routing via SVI

// Router

R1(config)#no interface g0/0.10 

##deletes subinterface (still remains if brief)

R1(config)#default interface g0/0

##resets G0/0 to default

R1(config)#interface g0/0

##enters g0/0 config mode

R1(config-if)#ip address 192.168.1.62[ip-ads] 255.255.255.192[sn mask]

 

// Switch

SW2(config)#default interface g0/1

## resets g0/1 (used as trunk port perviously)

SW2(config)#ip routing

##enables L3 routing on switch

SW2(config)#interface g0/1

SW2(config-if)#no switchport

## Changes if from L2 switch port to L3 routed port

 

SW2(config-if)#ip address 192.168.1.93[ip-ads] 255.255.255.252[sn mask]

## IP adrs assigned to it like as router interface

 

//default route pointing to R1 (SW2 > R1)

SW2(config-if)#exit

SW2(config)#ip route 0.0.0.0[dstin NW] 0.0.0.0[subnet] 192.168.1.194[next hop]

## 어떤 네트워크로 가든 192.168.1.194 에 넘겨라 (config default route)

SW2#show interfaces status

## will show G0/1 Vlan 'routed'

 

//SVI config

SW2(config)#interface vlan10

SW2(config-if)#ip address 192.168.1.62[ip-adrs] 255.255.255.192[subnet]

SW2(config-if)#no shutdown

## SVIs are shutdown default

 

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Acronyms:

• SVI : Switch Virtual Interface