VLAN interconnection training

[joe97]

Hi everyone, can anyone help me configure this? I've configured the VLANs on the 2960 switch, but why can't I communicate with other VLANs?

thank you

[Enes Simnica]

hello. Since ur 2960 is a Layer 2 switch, it can't route between VLANs by itself, even with IPs on interfaces. You need either: 1) A router with subinterfaces (router-on-a-stick), 2) A Layer 3 switch to handle routing, or 3) VLAN interfaces (SVIs) with IPs on a different device that can route. The switch ports can have IPs, but without VLAN interfaces or a router doing the inter-VLAN routing, traffic won't cross VLANs. 

but u can share here ur PT topology and I will check that my Cisco friend...

hope it helps and PEACE!

-Enes

[joe97]

my bad sir, yeah... my bad i haven't understand yet which layer 3 switch and which layer 2 switch in cisco, yes i'll attach my training.

thank you, thank you

[Joseph W. Doherty]

You're likely problem is, (within your PT attachment) interfaces to your hosts are trunk interfaces

Try making them access ports, in the desired host VLANs, and see if it works better.

[joe97]

hello sir, yes... the reason why i made and use trunk is i want each devices in each segments can be communicate. example PC in segment 4(172.25.4.55) can be ping to other segment like PC in segment 16 or 32 

[Joseph W. Doherty]

Unless your host devices use (the correct) VLAN tags, and most often they don't (except for VoIP phones), they won't exchange frames with a trunk port.

You can have each host within a different VLAN, and, again, their switch ports configured as access ports in the VLAN you desire.  The switch will then exchange those different VLANs with the router, where you (correctly, it appears) have that switch port configured as a trunk and the router port defined with subinterfaces.  The router would transfer frames between the VLANs.

[joe97]

i see, i try using access instead of trunk and it works 

[Enes Simnica]

u good man DW. If u can send the topology gain, because it opens blank .... SO u need to send the topology as a .pkt

[joe97]

Hi, sorry... i have make the pkt file as zip sir, but i don't know why it's blank

if you don't mind, i attached the topology here

[ThomasCampbell64]

If your trying to configure Router-on-a-stick you need to have the Router configured and the trunk to the router configured correctly too.

Switch:

1. Make sure all Ports on their VLAN are in access mode (swithport mode access)

2. Trunk to the router carring all VLANs (Swithport mode trunk

Router:

1. Gigabit0/0/0 (no ip add & no shut)

2. Gigigbit0/0/0.4 (encapsulation dot1q 4 & ip add 172.125.4.254 255.255.255.0 

[ThomasCampbell64 · Accepted solution]

Got it working:

Port needs to be in Access Mode

1.If you want to ping from the switch its needs a Default Gateway and a Management IP

2.Also other Host (End-devices) don't have their IP set other than PC0

[ThomasCampbell64 · Accepted solution]

 

core_switch#show run

Building configuration...

Current configuration : 2201 bytes

!

version 15.0

no service timestamps log datetime msec

no service timestamps debug datetime msec

no service password-encryption

!

hostname core_switch

!

!

!

!

!

!

spanning-tree mode pvst

spanning-tree extend system-id

!

interface FastEthernet0/1

switchport access vlan 4

switchport trunk allowed vlan 4,16,32-33,65

switchport mode access

!

interface FastEthernet0/2

switchport access vlan 4

switchport trunk allowed vlan 4,16,32-33,65

switchport mode access

!

interface FastEthernet0/3

switchport access vlan 16

switchport trunk allowed vlan 4,16,32-33,65

switchport mode access

!

interface FastEthernet0/4

switchport access vlan 16

switchport trunk allowed vlan 4,16,32-33,65

switchport mode access

!

interface FastEthernet0/5

switchport access vlan 32

switchport trunk allowed vlan 4,16,32-33,65

switchport mode access

!

interface FastEthernet0/6

switchport access vlan 32

switchport trunk allowed vlan 4,16,32-33,65

switchport mode access

!

interface FastEthernet0/7

switchport access vlan 33

switchport trunk allowed vlan 4,16,32-33,65

switchport mode access

!

interface FastEthernet0/8

switchport access vlan 33

switchport trunk allowed vlan 4,16,32-33,65

switchport mode access

!

interface FastEthernet0/9

switchport access vlan 65

switchport trunk allowed vlan 4,16,32-33,65

switchport mode access

!

interface FastEthernet0/10

switchport access vlan 65

switchport trunk allowed vlan 4,16,32-33,65

switchport mode trunk

!

interface FastEthernet0/11

!

interface FastEthernet0/12

!

interface FastEthernet0/13

!

interface FastEthernet0/14

!

interface FastEthernet0/15

!

interface FastEthernet0/16

!

interface FastEthernet0/17

!

interface FastEthernet0/18

!

interface FastEthernet0/19

!

interface FastEthernet0/20

!

interface FastEthernet0/21

!

interface FastEthernet0/22

!

interface FastEthernet0/23

!

interface FastEthernet0/24

!

interface GigabitEthernet0/1

switchport trunk allowed vlan 4,16,32-33,65

switchport mode trunk

!

interface GigabitEthernet0/2

!

interface Vlan1

no ip address

shutdown

!

interface Vlan4

ip address 172.25.4.100 255.255.255.0

!

ip default-gateway 172.25.4.254

!

!

!

!

line con 0

!

line vty 0 4

login

line vty 5 15

login

!

!

!

!

end

CORE_ROUTER#show run

Building configuration...

Current configuration : 1172 bytes

!

version 15.4

no service timestamps log datetime msec

no service timestamps debug datetime msec

no service password-encryption

!

hostname CORE_ROUTER

!

!

!

!

!

!

!

!

no ip cef

no ipv6 cef

!

!

!

!

!

!

!

!

!

!

no ip domain-lookup

!

!

spanning-tree mode pvst

!

!

!

!

!

!

interface GigabitEthernet0/0/0

no ip address

duplex auto

speed auto

!

interface GigabitEthernet0/0/0.4

encapsulation dot1Q 4

ip address 172.25.4.254 255.255.255.0

!

interface GigabitEthernet0/0/0.16

encapsulation dot1Q 16

ip address 172.22.16.254 255.255.255.0

!

interface GigabitEthernet0/0/0.32

encapsulation dot1Q 32

ip address 172.22.32.254 255.255.255.0

!

interface GigabitEthernet0/0/0.33

encapsulation dot1Q 33

ip address 172.22.33.254 255.255.255.0

!

interface GigabitEthernet0/0/0.65

encapsulation dot1Q 65

ip address 172.22.65.254 255.255.255.0

!

interface GigabitEthernet0/0/1

no ip address

duplex auto

speed auto

shutdown

!

interface GigabitEthernet0/0/2

no ip address

duplex auto

speed auto

shutdown

!

interface Vlan1

no ip address

shutdown

!

router rip

!

ip classless

!

ip flow-export version 9

!

!

!

!

!

!

!

line con 0

!

line aux 0

!

line vty 0 4

login

!

!

!

end

[joe97]

i have reconfigure it, and yeah.. my mistake not set the switch as access mode, instead trunk to each interface

thank you