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L2 gre tunnel groups

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  • 1.  L2 gre tunnel groups

    Posted Apr 04, 2019 07:51 AM

    Hi!

     

    I'm a bit confused regard gre tunnel groups.

    https://community.arubanetworks.com/t5/Controller-Based-WLANs/L2-GRE-Tunnel-Group/ta-p/233781

    https://community.arubanetworks.com/t5/Controller-Based-WLANs/How-to-configure-a-tunnel-group-for-redundancy-of-GRE-tunnels-on/ta-p/234791

     

    Mainly regarding how the setup looks on the datacenter side.

     

    So for example:

    Lets say I've got 2 remote controllers and 2 controllers in DC.

     

    remote controllers RC1 and  RC2 

    DataCenter DC1 and DC2 

     

    I would setup a GRE tunnel group on RC1 with 2 tunnels one to DC1 and one to DC2. Since it's a part of GRE tunnel group it wouldn't cause a network loop, only one tunnel is actually sending data.

     

    On DC1 I setup 1 GRE tunnel to RC1 and no tunnel group ?

    And on DC2 I setup 1 GRE tunnel to RC1 and no tunnel group ?

     

    Correct so far ?

    Now if one DC controller fails we have failover.

     

    But what if we need redundancy also on Remote site ?

    Wouldn't setting up a gre tunnel on this controller cause a loop ? 



  • 2.  RE: L2 gre tunnel groups

    EMPLOYEE
    Posted Apr 08, 2019 01:37 PM
    @Gonz wrote:

    Now if one DC controller fails we have failover.

     

    But what if we need redundancy also on Remote site ?

    Wouldn't setting up a gre tunnel on this controller cause a loop ? 

     

    What is redundancy if not failover?



  • 3.  RE: L2 gre tunnel groups

    Posted Apr 09, 2019 05:27 AM

    Well I ment what if RC1 goes down.

     

    Is my first satement about the setup correct ? 

    You setup gre group on remote site controller but GRE tunnels without gre group on Datacenter controllers ?



  • 4.  RE: L2 gre tunnel groups
    Best Answer

    EMPLOYEE
    Posted Apr 09, 2019 01:17 PM

    Now I understand your question.

     

    So yes, if concerned about the remote site controller, standard controller redunduncy methods are available. The APs at the remote site may have redundant controllers they can connect to at the site, or redundancy may be achieved using a backup controller off-site.

     

    Your statement on the tunnel groups is correct. The remote site will utilize a tunnel group so that the remote controller selects only one of the available GRE tunnels to use. Since the data center controllers only have one tunnel to each remote, there is no tunnel group used in their (the data center controllers') config.