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Helpful
9
Replies

connecting 2 switches together

David Hunt
Level 1
Level 1

Hello friends,

I am hoping someone can help me figure out what I am missing in my attempt to connect two switches together.

What I am attempting to do is to create a new data closest (Closet2) on the other side of the building. My existing setup is like this…. Closet1 has a Cisco 3524 running IOS 12.0 (5)

As you can see from the config below, it is nothing really fancy.

Interface GigabitEthernet0/1 contains a GBIC that has fiber the leads to another building

----------------------------

version 12.0

no service pad

service timestamps debug uptime

service timestamps log uptime

service password-encryption

!

hostname S00.PS

!

enable secret 5 $1$E0RR$10FXnIpD14wrAHTI2re7M.

!

clock timezone UTC -6

clock summer-time UTC recurring

!

no spanning-tree vlan 1

ip subnet-zero

!

interface FastEthernet0/1

switchport access vlan 20

spanning-tree portfast

!

interface FastEthernet0/2

switchport access vlan 20

spanning-tree portfast

!

.

.

.

.

.

.

interface FastEthernet0/23

switchport access vlan 20

spanning-tree portfast

!

interface FastEthernet0/24

switchport access vlan 20

spanning-tree portfast

!

interface GigabitEthernet0/1

switchport mode trunk

!

interface GigabitEthernet0/2

!

interface VLAN1

ip address 192.168.100.20 255.255.255.0

no ip directed-broadcast

no ip route-cache

!

!

ip default-gateway 192.168.100.1

!

line con 0

transport input none

stopbits 1

line vty 0 4

password 7 13160716050313

login

line vty 5 15

login

!

end

OK, now I have a new switch, Cisco 3560 running IOS 12.2 (53r)

I have a CAT5 connected to port 48 of the new switch, to port 24 of the existing switch.

Here is the basic running config of the new switch

------------------------------------

version 12.2

no service pad

service timestamps debug datetime msec

service timestamps log datetime msec

no service password-encryption

!

hostname Switch

!

boot-start-marker

boot-end-marker

!

enable secret 5 $1$Al0A$j7Xuh1bJ.79JM4KYEWEMw.

!

no aaa new-model

system mtu routing 1500

vtp mode transparent

ip subnet-zero

ip routing

!

!

spanning-tree mode pvst

spanning-tree extend system-id

!

vlan internal allocation policy ascending

!

vlan 20

name VLAN00020

!

!

!

interface FastEthernet0/1

!

interface FastEthernet0/2

!

interface FastEthernet0/3

.

.

.

interface FastEthernet0/46

!

interface FastEthernet0/47

switchport access vlan 20

!

interface FastEthernet0/48

switchport trunk encapsulation dot1q

switchport trunk native vlan 20

switchport mode trunk

!

!

interface GigabitEthernet0/1

!

interface GigabitEthernet0/2

!

interface GigabitEthernet0/3

!

interface GigabitEthernet0/4

!

interface Vlan1

ip address 192.168.100.21 255.255.255.0

!

ip default-gateway 192.168.100.1

ip classless

ip route 0.0.0.0 0.0.0.0 192.168.100.1

ip http server

ip http secure-server

!

!

control-plane

!

!

line con 0

line vty 0 4

password 7 13160716050313

login

line vty 5 15

password 7 13160716050313

login

!

End

Does anybody know what am I missing or what have I got misconfigured?

Any help is greatly appreciated.

1 Accepted Solution

Accepted Solutions

Your original post said F0/24, but regardless, yes both sides needs to be setup as trunk.

hostname S00.PS

!

interface FastEthernet0/24

des Trunk to Switch

switchport mode trunk

switchport trunk encapsulation dot1q

switchport trunk native vlan 20

switchport mode trunk

no switchport access vlan 20

no spanning-tree portfast

!

View solution in original post

9 Replies 9

jss.cisco
Level 1
Level 1

You have Switch configured as a trunk and S00.PS not completely configured as access.

hostname S00.PS

!

interface FastEthernet0/24

switchport access vlan 20

spanning-tree portfast

!

==================================

!

hostname Switch

!

terface FastEthernet0/48

switchport trunk encapsulation dot1q

switchport trunk native vlan 20

switchport mode trunk

!

I am sorry, I do not understand what this means...

"S00.PS not completely configured as access."

Do I need to change the config of

hostname S00.PS

!

interface FastEthernet0/24

switchport access vlan 20

spanning-tree portfast

if so... to what?

If you are connecting S00 F0/24 to Switch F0/48, both sides must be configured the same.  So either both sides access or both sides trunk.

ketanchavda
Level 1
Level 1

Is there trunk not working? ???

Sent from Cisco Technical Support Android App

"is there trunk not working" ?

how do I tell?

show interface trunk

If it is working you would see this:

Switch# show interface trunk

Port                Mode         Encapsulation  Status        Native vlan

Fa0/48            on             802.1q              trunking     20

yes,,, on switch... when I enter show int trunk i get

Port        Mode            Encapsulation  Status        Native vlan

Fa0/48     on               802.1q              trunking      20

so... do I need to also create fa0/23 on other switch as a trunk?

Your original post said F0/24, but regardless, yes both sides needs to be setup as trunk.

hostname S00.PS

!

interface FastEthernet0/24

des Trunk to Switch

switchport mode trunk

switchport trunk encapsulation dot1q

switchport trunk native vlan 20

switchport mode trunk

no switchport access vlan 20

no spanning-tree portfast

!

got it.... thank you!

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