Ether-channel problem between two different vendors

[hamzashahid]

hi this is hamza 

i m making ether-channel between two different switches first one is Cisco catalyst 3560 24PS and on other side fortiswitch 14D i have plugged two backbones on port 21 and 22 on Cisco side and on port 1 and 24 on fortiswitch side 

fortiswitch is using active mode while cisco is using passive mode 

as u can see the configuration 

the problem is when i configure ether-channel cisco switch shutdown port fa0/21 and if i plug into on another port it gets back up, it seems when i make-up LACP protocol that backbone doesn't work

both sides have same duplex and speed and both backbones are same in every form

Current configuration : 1739 bytes
!
version 12.2
service config
no service pad
service timestamps debug uptime
service timestamps log uptime
service password-encryption
!
hostname Switch
!
enable secret 5 $1$3E0V$UTj9qgb9OFltI28QZpi1p0
!
ip subnet-zero
!
!
spanning-tree mode pvst
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
!
!
!
!
interface Port-channel1
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface FastEthernet0/1
!
interface FastEthernet0/2
!
interface FastEthernet0/3
!
interface FastEthernet0/4
!
interface FastEthernet0/5
!
interface FastEthernet0/6
!
interface FastEthernet0/7
!
interface FastEthernet0/8
!
interface FastEthernet0/9
!
interface FastEthernet0/10
!
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
switchport trunk encapsulation dot1q
switchport mode trunk
switchport nonegotiate
no keepalive
speed 100
duplex full
channel-group 1 mode passive
channel-protocol lacp
!
interface FastEthernet0/22
switchport trunk encapsulation dot1q
switchport mode trunk
switchport nonegotiate
speed 100
duplex full
channel-group 1 mode passive
!
interface FastEthernet0/23
speed 100
duplex full
!
interface FastEthernet0/24
speed 100
duplex full
!
interface GigabitEthernet0/1
!
interface GigabitEthernet0/2
!
interface Vlan1
ip address dhcp
!
ip classless
ip http server
!
!
control-plane
!
!
line con 0
line vty 0 4
password 7 045A0F0B062F6C1C584B
login
line vty 5 15
password 7 045A0F0B062F6C1C584B
login
!
end

i tried without switchport nonegotiate but that still doesn't work out

hope u understand that problem 

Best Regards:

HAMZA SHAHID

[Reza Sharifi]

Hi,

If LACP does not work try it mode on.Example:

interface FastEthernet0/21
switchport trunk encapsulation dot1q
switchport mode trunk
speed 100
duplex full
channel-group 1 mode on

And test again.

HTH

[hamzashahid]

yes i will try this one , but i did not understand why do we need to use switchport trunk encapsulation dot1Q instead only using switchport mode trunk  i never use this encapsulation in packet tracer if this is necessary to use it with switchport mode trunk then y did not Cisco recommend it while training of CCNA

can u please guide me that switches in packet tracer performing layer 3 switches or layer 2 i can olny understand of word between L3 and L2 is the difference of ip assigning is it true or their is something else 

Best Regards:

HAMZA SHAHID 

[Reza Sharifi · Accepted solution]

The switchport trunk encapsulation dot1Q command is an older command for older IOS because in the past Cisco devices supported both ISL and dot1q. If you are running a new version of IOS, you don't need this command. All you need is:

switchport mode trunk

HTH