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Highlighted
Beginner

layer 3 Etherchannel

Hello,

I am studying for CCNP switching. I am trying to configure layer 3 channel between two switches in GNS3

 

     Swich_A(Gi0/0-1) -------------------Switch_B(Gi0/0-1)

 Po1 -  10.1.20.1/24                                 Po1 - 10.1.20.2/24

 

Even though I followed the steps to configure the ports of the switches, I can not ping the IP address

of the Port-channel from one switch to the other.

 

Below the configuration of Switch_A and switch_B

 

Switch_A

interface Port-channel1
 no switchport
 ip address 10.1.20.1 255.255.255.0

 

interface GigabitEthernet0/0
 description port_of_Po1
 no switchport
 no ip address
 negotiation auto
 channel-group 1 mode on
!         
interface GigabitEthernet0/1
 description port_of_Po1
 no switchport
 no ip address
 negotiation auto
 channel-group 1 mode on
!         

Switch_A#show etherchannel
                Channel-group listing:
                ----------------------

Group: 1
----------
Group state = L3
Ports: 2   Maxports = 4
Port-channels: 1 Max Port-channels = 1
Protocol:    -
Minimum Links: 0

 

//////////////////////////

Switch_B

 

interface Port-channel1
 no switchport
 ip address 10.1.20.2 255.255.255.0

 

interface GigabitEthernet0/0
 description port_to_Po1
 no switchport
 no ip address
 negotiation auto
 channel-group 1 mode on
!         
interface GigabitEthernet0/1
 description port_to_Po1
 no switchport
 no ip address
 negotiation auto
 channel-group 1 mode on

 

 

Switch_B#show etherchannel
                Channel-group listing:
                ----------------------

Group: 1
----------
Group state = L3
Ports: 2   Maxports = 4
Port-channels: 1 Max Port-channels = 1
Protocol:    -
Minimum Links: 0

 

Switch_B#show cdp neighbors detail
-------------------------
Device ID: Switch_A
Entry address(es):
  IP address: 10.1.20.1
Platform: Cisco ,  Capabilities: Router Switch IGMP
Interface: GigabitEthernet0/1,  Port ID (outgoing port): GigabitEthernet0/1
Holdtime : 163 sec

.

Switch_B#ping 10.1.20.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.20.1, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
Switch_B#.

.

Where am I wrong?

 

Thank you

9 REPLIES 9
Highlighted
Hall of Fame Expert

Re: layer 3 Etherchannel

Hi,

 

Never used GNS before but sometimes not all the functions work the same as a regular switch.

Are ports g0/0 and 0/1 in up and up mode. "sh ip int brie" should show you that.

HTH

Highlighted
VIP Mentor

Re: layer 3 Etherchannel

Try no ip cef in global command and let me know.

BB
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Highlighted
VIP Mentor

Re: layer 3 Etherchannel

Just to add you could also try LACP or PAGP in case it does not support ON mode in the emulator
Highlighted

Re: layer 3 Etherchannel

HI,

 

Please share the image code in order to test in the lab. Thanks 

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Highlighted
Beginner

Re: layer 3 Etherchannel

Hello,

 

Switch_A#show ver 

Cisco IOS Software, vios_l2 Software (vios_l2-ADVENTERPRISEK9-M), Version 15.2(4.0.55)E, TEST ENGINEERING ESTG_WEEKLY BUILD, synced to END_OF_FLO_ISP

 

Switch_B has the same

 

Thank you

Highlighted
VIP Mentor

Re: layer 3 Etherchannel

thats layer 2 image not layer 3 looking at it ....
so its probly not able to complete a layer 3 port-channel syntax like that with IP as its L3 feature

 

EDIT: Use a L3 image same config should work

Highlighted

Re: layer 3 Etherchannel

@giacomo12

 

Your image is not supporting so you need to have a special/modified image in order to perform layer 3 functions.

 

 

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Highlighted

Re: layer 3 Etherchannel

Change the image to L3 and share the outputs here 

 

 

 

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Highlighted
VIP Mentor

Re: layer 3 Etherchannel

why not try with IOL images- it is small and less resource required. ( compare to vIOS)

BB
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