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  • 1.  Creating LACP LAG & Static routes

    Posted May 05, 2023 12:41 PM

    Hello there,

    I've got two questions and I'll really appreciate some help and guidance.

    First, we would like to configure a LAG/port-channel between Aruba 2930M and Cisco 3850 switches, as follows :

    On Aruba :
     trunk 1/A1,2/A1 trk6 lacp

    On Cisco :

    interface port-channel10
    switchport mode trunk

    interface gi1/10/1
    switchport mode trunk
    channel-group 10 mode active 

    interface gi1/10/2
    switchport mode trunk
    channel-group 10 mode active 

    I've noticed that once I added mode "active" to the physical interface I lose the connectivity to the Aruba switch.

    Does this command "trunk 1/A1,2/A1 trk6 lacp"  on Aruba switch mean LACP is in active mode ? if not, how can I make it active to match what's configured on Cisco switch?

    Secondly, the default route (0.0.0.0/0) on Aruba 2930M switch is pointing to the next-hop which is our VPLS provider currently, now we're installing a firewall and we would like to use it as the primary gateway and VPLS as backup if the link to the firewall ever dropped/disconnected.

    So, I'm about to do the following :

    ip route 0.0.0.0/0 <firewall LAN IP> distance 1

    ip route 0.0.0.0/0 <VPLS  IP> distance 10

    so, when I do show ip route , I only can see the default route is pointing to the firewall IP only ? is that expected ?
      

    Thanks!



  • 2.  RE: Creating LACP LAG & Static routes
    Best Answer

    Posted May 05, 2023 05:22 PM

    Question 1 - Have you run command "show lacp local" to check the LACP mode of each link, when the trunk is up? 
    Question 2 - on the AoS-S series switches "show ip route" displays active static routes. You can test this by quickly deleting your lower distanced route. The other static route should then show in the table. Assuming the L3 interface with the next hop is UP/UP. 



    ------------------------------
    If my post was useful, please Accept Solution and Give Kudos.
    ------------------------------
    Zak Chalupka
    Principal Engineer - HPE Aruba
    ACDX | ACMP | ACSP | ACCP
    wifizak@hpe.com
    ------------------------------
    Ideas expressed here are solely my own and not necessarily that of HPE Aruba.
    ------------------------------



  • 3.  RE: Creating LACP LAG & Static routes

    Posted May 07, 2023 03:02 PM

    Hi! this would be of help. A question with regard to your sentence "I've noticed that once I added mode "active" to the physical interface I lose the connectivity to the Aruba switch.": what's the VLAN membership status of both the trk6 logical interface (Aruba 2930M side) and channel-group 10 logical interface (Cisco 3850 side)? do they match? what's about show lacp on Aruba side? does it show you that 1/A1 and 2/A1 (thus you're dealing with a Aruba 2930M backplane stack, isn't it?) are well forming the Trk6 and all is perfectly matched with the Cisco peer's ports?




  • 4.  RE: Creating LACP LAG & Static routes

    Posted May 09, 2023 06:28 AM

    Thanks for your reply.

     what's the VLAN membership status of both the trk6 logical interface (Aruba 2930M side) and channel-group 10 logical interface (Cisco 3850 side)? 
    All VLANs are allowed on the trunk.

     what's about show lacp on Aruba side?
    I couldn't test it as I lost the connectivity to the Aruba (my machine is connected to the 3850)

    What's equivalent for Cisco  mode active in Aruba ? is it just trunk 1/A1 and 2/A1 trk6 lacp ?
    same thing in Cisco mode on ?




  • 5.  RE: Creating LACP LAG & Static routes

    Posted May 08, 2023 09:49 AM
      |   view attached

    Your lacp configuration is correct. 
    On the Cisco, you have to do a "no shut" to turn on the channel-group. 
    If it is still not working, you can consider do the static port aggregation 
    Aruba:  trunk 1/A1,2/A1 trk6 trunk
    Cisco: interface Port-channel10
              interface channel-group 10 mode on




  • 6.  RE: Creating LACP LAG & Static routes

    Posted May 09, 2023 07:32 AM

    Thanks for your reply.

    Can I configure the following :
     interface Port-channel10
      interface gi1/0/1
      channel-group 10 mode on

    On Aruba : 
    trunk 1/A1,2/A1 trk6 lacp






  • 7.  RE: Creating LACP LAG & Static routes

    Posted May 09, 2023 12:08 PM
    Edited by 802.zak May 09, 2023 12:08 PM

    You would want to configure
    Cisco:
     interface Port-channel10
      interface gi1/0/1
      channel-group 10 mode active

    Aruba:
    trunk 1/A1,2/A1 trk6 lacp



    ------------------------------
    If my post was useful, please Accept Solution and Give Kudos.
    ------------------------------
    Zak Chalupka
    Principal Engineer - HPE Aruba
    ACDX | ACMP | ACSP | ACCP
    wifizak@hpe.com
    ------------------------------
    Ideas expressed here are solely my own and not necessarily that of HPE Aruba.
    ------------------------------