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OSPF Filter static routes

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  • 1.  OSPF Filter static routes

    Posted Apr 19, 2021 12:56 PM
    Hello

    Is a 8320 (TL.10.06.0110).

    I want only certain static routes to be inserted into OSPF for redistribution.
    Im fighting a bit with the route-map, prefix-list setup

    For testing purpose i have the following static routes 

    ip route 1.1.1.1/32 192.168.55.55
    ip route 10.1.76.0/24 10.0.1.7
    ip route 10.1.77.0/24 10.0.1.7     <<< should NOT be distributed via OSPF

    I tried with : 

    ip prefix-list route-prefixes seq 10 deny 10.1.77.0/24

    route-map NoDist deny seq 10
    match ip address prefix-list route-prefixes

    router ospf 1
    ......
    redistribute static route-map NoDist

    However with this no static routes are being distributed anymore.

    Thanks for your help
    Andreas

    ------------------------------
    Meyer Marius
    ------------------------------


  • 2.  RE: OSPF Filter static routes

    EMPLOYEE
    Posted Apr 19, 2021 02:50 PM
    This should help.

    1.Create prefix list  with deny and permits
    2. Then attache to a permit route map
    3. redistribute with "static route map"


    see below


    ip prefix-list MyRoutes seq 10 deny 10.10.76.0/24
    ip prefix-list MyRoutes seq 20 permit 10.10.77.0/24
    ip prefix-list MyRoutes seq 30 permit 10.10.66.0/24

    route-map MyDist2 permit seq 10
    match ip address prefix-list MyRoutes

    router ospf 1
    redistribute static route-map MyDist2


    **************output on neighbour*********10.10.76.blocked others are allowed***********
    show ip rou

    Displaying ipv4 routes selected for forwarding

    '[x/y]' denotes [distance/metric]

    1.1.1.0/30, vrf default
    via 1/1/1, [0/0], connected
    1.1.1.2/32, vrf default
    via 1/1/1, [0/0], local
    10.10.66.0/24, vrf default
    via 1.1.1.1, [110/25], ospf
    10.10.77.0/24, vrf default
    via 1.1.1.1, [110/25], ospf

    show ip ospf routes
    Codes: i - Intra-area route, I - Inter-area route
    E1 - External type-1, E2 - External type-2

    OSPF Process ID 1 VRF default, Routing Table
    ---------------------------------------------

    Total Number of Routes : 3

    1.1.1.0/30 (i) area: 0.0.0.0
    directly attached to interface 1/1/1, cost 100 distance 110
    10.10.66.0/24 (E2)
    via 1.1.1.1 interface 1/1/1, cost 25 distance 110
    10.10.77.0/24 (E2)
    via 1.1.1.1 interface 1/1/1, cost 25 distance 110


    ------------------------------
    Kamal Takodra
    If my post was useful accept solution and/or give kudos
    ------------------------------

    Original Message