Forum Discussion

SanYang's avatar
SanYang
Icon for Cirrus rankCirrus
Oct 16, 2024

Problems with ping dropped packets

Hello Experts,

 

I've recently encountered a strange problem where the ping node drops packets (about 10-20%) when gtm1 is active, but when gtm1 is in standby, the ping node doesn't drop any packets.

gtm2 works fine in both active and standby states, no packets are dropped!

Does anyone have any experience with this?

 

Here is my structure



Thanks

application delivery
LTM
  • Jeffrey_Granier's avatar
    Jeffrey_Granier
    Icon for Employee rankEmployee
    Oct 17, 2024

    The only thing I can glean from this setup is the trunk links between Po27 & SW6FA4-Internet1....   Could the ping traffic that's experiencing drops be hashed to a particular link in the port channel? *** Do during maintenance window *** if possible, disable one link between gtm1 & SW6FA4-Internet1.  monitor ping loss, restore then disable the other link.  You could have the traffic hashed onto one of the links in the port channel and its possible a bad patch.  

  • zamroni777's avatar
    zamroni777
    Icon for Nacreous rankNacreous
    Oct 19, 2024

    how is the exact/detailed config of po27 in switches and f5 sides?
    gtm1 and gtm2 should not be part of single LACP because f5 pairs are not cascaded switches.

    you will also need to configure correct spanning config.
    f5 devices by default will pass thorugh spanning tree frames.
    i suggest disable it in f5 sides so it behaves like servers.
    https://techdocs.f5.com/en-us/bigip-14-1-0/big-ip-tmos-routing-administration-14-1-0/spanning-tree-protocol/spanning-tree-mode.html

    • SanYang's avatar
      SanYang
      Icon for Cirrus rankCirrus
      Oct 20, 2024

      Hi zamroni777  ,

      Thanks for your reply.

      F5 and Switch po27 are both LACP.
      F5's STP mode is deisable already.