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Nantu_Mandal_16's avatar
Nantu_Mandal_16
Icon for Nimbostratus rankNimbostratus
Sep 15, 2014

Why "redistribute kernel" in OSPF configuration

Hi, I just check the OSPF configuration of my existing LTM. Can someone help to understand why "redistribute kernel" in OSPF configuration is used?

 

sh running-config

! no service password-encryption ! no banner motd ! interface lo ! interface tmm0 ! interface HA ! interface V700 ip ospf message-digest-key 1 md5 Nott4you ! interface V701 ! router ospf 1 ospf router-id 10.124.128.37 redistribute kernel redistribute connected route-map Allowed_Connected redistribute static passive-interface HA passive-interface V701 area 13 authentication message-digest network 10.124.128.32 0.0.0.15 area 13 ! ip route 10.124.136.0/24 Null ! access-list 1 permit 10.124.128.32 0.0.0.15 access-list 1 permit 10.124.128.16 0.0.0.15 ! route-map Allowed_Connected permit 1 match ip address 1 ! line con 0 login line vty 0 4 login ! end

 

application delivery
LTM

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  • boneyard's avatar
    boneyard
    Icon for MVP rankMVP
    Sep 15, 2014

    according to this document:

     

    http://support.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/tmos-ip-routing-administration-11-2-0/4.html

     

    it enables the sharing of the IPs of your virtual servers into OSPF.

     

  • Sumanta_88744's avatar
    Sumanta_88744
    Icon for Cirrus rankCirrus
    Apr 15, 2016

    Hi Nantu

     

    By default the dynamic routing protocol would redistribute connected interfaces on the F5 LTM. If you configure redistribute static, then the protocol would also advertise those static routes via dynamic protocol. However, the virtual server routes are neither connected nor static type. So, it falls under a new type known as kernel. That's why we need to redistribute kernel routes into the protocol for making the VS IP to be reachable from backbone.

     

    Regards,

     

    Sumanta.