. L3 Switch.pdf

multi layer

기본적으로 L3 switch는 ports들이 모두 L2로 되어있다.

1. L3로 바꿔서 주소를 주는방법, routed port 는 no switchport 명령어를 이용하여 스위치 포트를 라우터 포트처럼 사용하는 방법

   [Routed]
   **ip routing**
   
   interface f1/0
   **no switchport**
   ip addres 1.1.1.1 255.255.255.0
   

2. L2에 vlan 으로 주소를 준다. SVI(Switch Virtual Interface)는 interface vlan 명령어를 이용하여 스위치 VLAN에 IP 주소 할당하는 방법

   [SVI] access mode 
   **ip routing**
   
   vlan 10
   
   interface vlan 10
   ip address 1.1.12.1 255.255.255.0
   no shutdown 
   
   interface f1/0
   switchport mode access
   switchport access vlan 10
   
   [SVI] trunk mode 
   ip routing
   vlan 10  => vlan을 미리 생성해 주어야 한다.
   
   interface vlan 10
   ip address 1.1.12.1 255.255.255.0
   no shutdown
   
   interface f1/0
   switchport trunk encapsulation dot1q
   switchport mode trunk
   

■ L2스위치

• 라우팅 불가능
• VLAN1에만 원격제어를 위한 IP 할당 가능
• L2 link port로만 동작 (프레임만 전송)
• 여러 개의 VLAN 설정시 라우터 필요

■ L3스위치

• IP를 설정하여 라우팅 가능
• ㅍSVI를 이용하여 모든 Vlan에 IP 설정 가능
• L2, L3 link port 둘다 동작 가능 (패킷, 프레임 전송 가능)
• 여러 개의 VLAN 설정시 라우터 필요 없음 (각각의 VLAN에 게이 트웨이 역활을 함

<예제1>

L3 Switch2
interface GigabitEthernet0/0
 no switchport
 ip address 192.168.20.2 255.255.255.0
 negotiation auto
!
interface GigabitEthernet0/1
 no switchport
 ip address 1.1.12.2 255.255.255.0
 negotiation auto

<vpc ip 입력하기>

ip [ip address]/subnet [default gate]
save

VPCS> ip 192.168.20.1/24 192.168.20.2
Checking for duplicate address...
PC1 : 192.168.20.1 255.255.255.0 gateway 192.168.20.2

<제대로 적었는지 확인하는 방법>
vpcs> show ip

<예제2- vlan 모드>

L3 switch 
ip routing 

interface Vlan10
 ip address 192.168.10.2 255.255.255.0
 no sh 
!
interface Vlan20
 ip address 192.168.20.2 255.255.255.0
 no sh

interface GigabitEthernet0/0
 switchport trunk encapsulation dot1q
 switchport mode trunk

L2 Switch
no ip routing

interface GigabitEthernet0/0
 switchport access vlan 10
 switchport mode access
!
interface GigabitEthernet0/1
 switchport access vlan 20
 switchport mode access

interface GigabitEthernet0/2
 switchport trunk encapsulation dot1q
 switchport mode trunk

<종합>

<L3-A>
ip routing
vlan 10
vlan 20

interface GigabitEthernet0/0
 switchport trunk encapsulation dot1q
 switchport mode trunk
 negotiation auto
!
interface GigabitEthernet0/1
 no switchport
 ip address 1.1.12.1 255.255.255.0
 negotiation auto
 
interface Vlan10
 ip address 192.168.10.254 255.255.255.0
!
interface Vlan20
 ip address 192.168.20.254 255.255.255.0

<L3-B>

interface GigabitEthernet0/0   => SVI VLAN 100
 switchport access vlan 100
 switchport mode access
 media-type rj45
 negotiation auto
!
interface Vlan100
 ip address 1.1.23.1 255.255.255.0
!
interface GigabitEthernet0/1   => routed
 no switchport
 ip address 1.1.12.2 255.255.255.0
 negotiation auto

<L3-C>
interface GigabitEthernet0/0
 switchport access vlan 30
 switchport mode access
 media-type rj45
 negotiation auto
!
interface GigabitEthernet0/1
 switchport access vlan 30
 switchport mode access
 media-type rj45
 negotiation auto
!
interface GigabitEthernet0/2
 switchport access vlan 100
 switchport mode access
 media-type rj45
 negotiation auto
!
interface GigabitEthernet0/3
 switchport access vlan 101
 switchport mode access
 media-type rj45
 negotiation auto
!
interface Vlan30
 ip address 192.168.30.254 255.255.255.0
!
interface Vlan100
 ip address 1.1.23.2 255.255.255.0
!
interface Vlan101
 ip address 1.1.34.1 255.255.255.0

<L3-D>
ip routing
vlan 40  => vlan 생성
vlan 50
vlan 60

interface GigabitEthernet0/1
 no switchport
 ip address 1.1.34.2 255.255.255.0
 negotiation auto
!
interface GigabitEthernet0/0
 switchport trunk encapsulation dot1q
 switchport mode trunk
 media-type rj45
 negotiation auto
!
 interface Vlan40
 ip address 192.168.40.254 255.255.255.0
!
interface Vlan50
 ip address 192.168.50.254 255.255.255.0
!
interface Vlan60
 ip address 192.168.60.254 255.255.255.0

. Trunk.pdf