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werner_verheyle's avatar
werner_verheyle
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May 31, 2023
Solved

BGP stops advertising after upgrade

Hello ,  we have an LTM VE in  a HA cluster . We have defined a couple of route domain (RD) and have enabled BGP/BFD for these route domains . There is a BGP routing configuration present (imish -r...
application delivery
bgp
LTM VE
  • Mohamed_Ahmed_Kansoh's avatar
    Mohamed_Ahmed_Kansoh
    May 31, 2023

    Hi werner_verheyle , 

    First you should take this TMOS Version v14.1.5.2 and open F5 Bug tracker web site and see all of it's Bugs , maybe you will find bug related to BGP or BFDs or Advertising routes. 

    Look at this : https://cdn.f5.com/product/bugtracker/ID1134057.html 
    I got it from Bug tracker , it's a bug related to V14.1.5.2. 

    > the other thing , you have to raise a case with F5 support , you may get hotfix to cover this issue. 

Mohamed_Ahmed_Kansoh's avatar
Mohamed_Ahmed_Kansoh
Icon for MVP rankMVP

Hi werner_verheyle , 

First you should take this TMOS Version v14.1.5.2 and open F5 Bug tracker web site and see all of it's Bugs , maybe you will find bug related to BGP or BFDs or Advertising routes. 

Look at this : https://cdn.f5.com/product/bugtracker/ID1134057.html 
I got it from Bug tracker , it's a bug related to V14.1.5.2. 

> the other thing , you have to raise a case with F5 support , you may get hotfix to cover this issue. 

werner_verheyle's avatar
werner_verheyle
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May 31, 2023

thx , i'll open a case for this .  

Just a remaining question , from bug report https://cdn.f5.com/product/bugtracker/ID1134057.html i can see this is also applicable on the version we use now ( v13.1.1.5 ) . So asking myself why we never encountered this before . Seems to be present in all version & only engineering hotfix will help

  • Mohamed_Ahmed_Kansoh's avatar
    Mohamed_Ahmed_Kansoh
    Icon for MVP rankMVP
    May 31, 2023

    Hi werner_verheyle , 
    I see there are multiple bugs related to BGP and BFD Flapping. 

    anyway , Beside opening Case with F5 to request Hotfix , 

    Review this Article please : https://my.f5.com/manage/s/article/K15923612#proc1

    navigate virtual address  settings to see if { Route advertisement } enabled or not , also have you checked it after upgrade or not ? 

    I recommend that you can try to upgrade in VE as a test to V14.1.5.2 and see if the Route advertisement value in each Virtual address changed in Version 14 or everything still the same. 

  • werner_verheyle's avatar
    werner_verheyle
    Icon for Altocumulus rankAltocumulus
    May 31, 2023

    will perform upgrade again on standby device in HA cluster , no spare LTM VE anymore at hand .

    I've check RHI last night & indeed it was on selective after the upgrade . We changed it back to "when available" but this doesn't change anything . 

    upgrading changes a lot for BGP 

    • wtwiggs's avatar
      wtwiggs
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      Jun 02, 2023

      we are using a similar configuration for long time, started on v13.1 and now on v14.1.4.4 (migration from v13 to v14 was a couple years ago, don't have notes on exact versions before/after, but didn't see any issues)... for what its worth, it does seem like v14.1 is working... we have multiple route domains and using both BGP and OSPF to do route health injection to advertise our virtual addresses out of each datacenter.  we also use a route map to control the redistribution of kernel into bgp/ospf.  our route map is based on cidr range using access list (not prefix list).

      couple of thoughts/questions:

      1. what are the details of your KERNEL2BGP route map (e.g. prefix list or ?)

      2. have you tried Enabled or Always on the virtual address route advertisement (vs Selective or When Available)?

      3. do the kernel routes show in the "sh ip route" output of imish?

      • wtwiggs's avatar
        wtwiggs
        Icon for Altocumulus rankAltocumulus
        Jun 02, 2023

        two more thoughts:

        4. what if you temporarily remove your BFD configuration (we do not have this)?

        5. what if you temporarily remove your route-map and just generically redistribute kernel as a test?