Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

Lightspeed_VT_5's avatar
Lightspeed_VT_5
Icon for Nimbostratus rankNimbostratus
Jul 18, 2008

Redundant pair and switch fault tolerance

Sorry if this hardware question is off-topic, but didn't see anywhere else to post. Also, I'm a developer stuck with a network implementation, so bear with me on that, too.     We have ...
config
design
JRahm's avatar
JRahm
Icon for Admin rankAdmin
Jul 21, 2008
I'd need a greater discovery of the environment to weigh in with an informed opinion. Blind, I'd recommend connecting the first LTM to the first switch, and the second LTM to the second switch. For the greatest redundancy, you could connect like this: 
  
      
   SWITCH1                                     SWITCH2   
        ||                                                  ||                
        ||                                                  ||    Client-side LACP Trunks (client vlans)   
        ||                                                  ||     
   LTM 1500 =================LTM1500   
        ||       (Mirror/Sync LACP Trunk)        ||     
        ||                                                  ||    Server-side LACP Trunks (server vlans)   
        ||                                                  ||    
   SWITCH1                                     SWITCH2

If you have multiple blades in each chassis, you can connect each leg of an LACP trunk into each blade for even greater redundancy. Make sure you check the asic limitations on your switch linecards before assigning ports, most cards oversubscribe the ports so you want to be as optimal as possible in your assignment.