Wired

last person joined: 2 hours ago 

Bring performance and reliability to your network with the Aruba Core, Aggregation, and Access layer switches. Discuss the latest features and functionality of the ArubaOS-Switch and ArubaOS-CX devices, and find ways to improve security across your network to bring together a mobile first solution.
Expand all | Collapse all

ArubaOS-CX VSX: recommended linkup-delay value for very low ARP/MAC numbers scenario

Jump to Best Answer
This thread has been viewed 2 times
  • 1.  ArubaOS-CX VSX: recommended linkup-delay value for very low ARP/MAC numbers scenario

    Posted Mar 13, 2019 08:02 AM

    VSX linkup-delay default value is 180 seconds (3 minutes)...some recommended values for Aruba 832x platforms are summarized in this table:

     


    VSX_Linkup-Delay_recommended_values_ArubaOS-CX_10.02.png

    I'm asking if having very low ARP/MAC numbers will let the recommended linkup delay timer to be safely lowered below 120 seconds in a range between, let me say, 40 and 100 seconds.

     

    Any experience about that?



  • 2.  RE: ArubaOS-CX VSX: recommended linkup-delay value for very low ARP/MAC numbers scenario

    Posted Mar 13, 2019 09:04 AM

    For very few hosts/routes, say for demo purpose, I did use 40seconds.

    I'll even decrease further and let you know.

    Is it for production (keeping margin for scaling up) or for demo ?

     

    Regards,

    Vincent



  • 3.  RE: ArubaOS-CX VSX: recommended linkup-delay value for very low ARP/MAC numbers scenario

    Posted Mar 13, 2019 09:19 AM

    Production.

     

    We have a simple Layer 2 scenario only (maybe you would recall...):

     

    0 ARP entries listed:

     

    Aruba-8320-1# show arp summary
    ARP Entry's State                 IPv4        IPv6     
    ---------------------------------------------------------
    Number of Reachable ARP entries   0           0        
    Number of Stale ARP entries       0           0        
    Number of Failed ARP entries      0           0        
    Number of Incomplete ARP entries  0           0        
    Number of Permanent ARP entries   0           0        
    ---------------------------------------------------------
    Total ARP Entries- 0              0           0        
    ---------------------------------------------------------
    Aruba-8320-1# show arp summary vsx-peer 
    ARP Entry's State                 IPv4        IPv6     
    ---------------------------------------------------------
    Number of Reachable ARP entries   0           0        
    Number of Stale ARP entries       0           0        
    Number of Failed ARP entries      0           0        
    Number of Incomplete ARP entries  0           0        
    Number of Permanent ARP entries   0           0        
    ---------------------------------------------------------
    Total ARP Entries- 0              0           0        
    ---------------------------------------------------------

    MAC Addresses: below 100 entries on both VSX nodes.

     

    The desire is to have VSX LAGs rapidly collecting and distributing just after a node reboot (as example, after a VSX software update).



  • 4.  RE: ArubaOS-CX VSX: recommended linkup-delay value for very low ARP/MAC numbers scenario

    Posted Mar 13, 2019 09:47 AM

    I successfully tested (with less hosts) 30seconds. You should be good with 30seconds. Do you need to lower timer ?



  • 5.  RE: ArubaOS-CX VSX: recommended linkup-delay value for very low ARP/MAC numbers scenario

    Posted Mar 13, 2019 10:07 AM

    No, I think 30 seconds should be sufficient given that we actually are at 180 seconds...we mainly have VSX LAGs...so, in our view, having all those VSX LAGs up in ALFNCD state as quickly as possible would be great.

     

    Does the vsx linkup-delay timer need to be configured VSX Primary only or I must configure it (with equal values) on both VSX nodes?



  • 6.  RE: ArubaOS-CX VSX: recommended linkup-delay value for very low ARP/MAC numbers scenario
    Best Answer

    Posted Mar 13, 2019 10:15 AM

    You must configure it on both. The value does not have to be identical.

    Say, you can have 35seconds on secondary and 30seconds on primary.

    However, for simplicity, I recommend to have same values.

    If you do not configure it, it will take the default value which is 180s.

     



  • 7.  RE: ArubaOS-CX VSX: recommended linkup-delay value for very low ARP/MAC numbers scenario

    Posted Mar 13, 2019 10:28 AM

    Thank you so much Giles!