Etherchannel combined with Router on a stick


I honestly was not going to create any new post this weekend after I spent 8 hrs on Friday evening after work creating CCIE Security lab and finished at 3am however I found this Etherchannel combined with Router on a stick idea while browsing around switching area and felt like I had to lab it up and see if it actually works because firstly to this day I have not heard anyone talked about it and secondly I personally have not come across it in any CCNP , CCIE workbooks.

headsmash4

When configuring this at first for a few moments I was smashing my head against the keyboard and then I discovered that the problem lies in GNS3 itself. For some strange reason this will only work if the router you are using to create an etherchannel on which in our case is R1 is the 7200 series. I have not had a chance to test this in a real world yet nor have I seen such implementation before but it is definitely something to keep an yes on !

…so this funny looking drawing is what I found

ethrport-orig

and this is how it looks like in GNS3 , very simple set up , nothing crazy

ETHERCHANNELROUTER

R1 CONFIG :

R1(config-if-range)#int po 1
R1(config-if)#int ran f 0/0 – 1
R1(config-if-range)#channel-group 1
R1(config-if-range)#no shut
R1(config-if-range)#int po 1
R1(config-if)#no shut
R1(config-if)#int po 1.10
R1(config-subif)#encapsulation dot1Q 10
R1(config-subif)#ip add 10.10.10.1 255.255.255.0
R1(config-subif)#int po 1.20
R1(config-subif)#encapsulation dot1Q 20
R1(config-subif)#ip add 20.20.20.1 255.255.255.0

 

HOST 1 CONFIG :

HOST1(config)#int f 0/0
HOST1(config-if)#ip add 10.10.10.3 255.255.255.0
HOST1(config-if)#no shut
HOST1(config-if)#do ping 10.10.10.1 re 500

Type escape sequence to abort.
Sending 500, 100-byte ICMP Echos to 10.10.10.1, timeout is 2 seconds:
………………………………..!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Success rate is 76 percent (143/188), round-trip min/avg/max = 64/170/436 ms

 

HOST 2 CONFIG :

HOST2(config)#int f 0/0
HOST2(config-if)#ip add 20.20.20.4 255.255.255.0
HOST2(config-if)#no shut
HOST2(config-if)#do ping 20.20.20.1 re 500

Type escape sequence to abort.
Sending 500, 100-byte ICMP Echos to 20.20.20.1, timeout is 2 seconds:
………………………………………….!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!
!!!!!!!!!!!!!.
Success rate is 66 percent (102/154), round-trip min/avg/max = 1/88/300 ms

 

SW1 CONFIG :

SW1#VLAN data
SW1(vlan)#vl 10
VLAN 10 added:
Name: VLAN0010
SW1(vlan)#vl 20
VLAN 20 added:
Name: VLAN0020
SW1(vlan)#app
APPLY completed.
SW1(vlan)#exi
APPLY completed.
Exiting….
SW1#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
SW1(config)#int f 1/3
SW1(config-if)#swi mo acc
SW1(config-if)#swi acc vl 10
SW1(config-if)#int f 1/4
SW1(config-if)#swi mo acc
SW1(config-if)#swi acc vl 20
SW1(config-if)#int ran f 1/0 – 1
SW1(config-if-range)#channel-group 1 mo o
Creating a port-channel interface Port-channel1
SW1(config-if-range)#
*Mar  1 00:03:09.659: %EC-5-BUNDLE: Interface Fa1/0 joined port-channel Po1
*Mar  1 00:03:09.747: %EC-5-BUNDLE: Interface Fa1/1 joined port-channel Po1
SW1(config-if-range)#no shut
*Mar  1 00:03:12.575: %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel1, changed state to up

 

The reason why the icmp ping is failing at first is simply because I tend to send ping before the upstream device configuration is completed , most of the time I do it when configuring frame relay network , send ping between the devices and then start configuring for instance the frame switch , don’t ask me why it’s just one of those things that I do 🙂

I know that for some of you this configuration is very simple and I admit , it is very simple but like I said the reason why I decided to post it is because etherchannel combined with router on a stick is just one of those techniques I have never seen before ale like I mentioned in the beginning this did not work for me on any other platform except for 7200 series router so as soon as I test it in real life on a few different device models I will let you know !

 

Enjoy !

Tom

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About ccie4all
Hello, and welcome to the first post of my CCIE blog This blog has got one simple goal and that is to improve our skills in Cisco Networking field so we can become best engineers on a job market. Wordpress Blog https://ccie4all.wordpress.com/ information about the changes made to Gns3 BGP , MPLS and R&S CCIE labs. In order to access and download all provided materials and receive important updates from Gns3 BGP , MPLS and R&S CCIE labs under GNS3 tab in the main header please go ahead and subscribe to https://ccie4all.wordpress.com/ ! All other posts have not been affected and can be accessed at any given time. Enjoy ! Tom

4 Responses to Etherchannel combined with Router on a stick

  1. Junior Ungaro says:

    Sensational! Topology is working properly? And what routers support this combination of etherchannel + router on a stick? Thank you!

    • ccie4all says:

      Hello!

      So far I have not been able to test this set up on any other platform rather than a 7200 series router but will update the post as soon as I discover something new !

      Best!
      Tom

      • Junior Ungaro says:

        Ok! Thank you!

  2. Aro says:

    Just put this up between a ASR1001 and 4500-X in VSS and it works fine 🙂

    ASR:
    1 Po1(RU) LACP Gi0/0/1(bndl) Gi0/0/2(D)

    4500:
    10 Po10(SU) LACP Te1/2/3(P)
    20 Po20(SU) LACP Te2/2/3(P)

    cat4500e-universalk9.SPA.03.06.00.E.152-2.E.bin
    asr1001-universalk9.03.13.00.S.154-3.S-ext.bin

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