ExtremeSwitching (EXOS)

  • 1.  OSPF redistribute static (blackhole) routes

    Posted 05-13-2014 03:40
    Hi everybody.
    I have Summit x480 with connected subnet 172.30.0.0/16. But I'd like to advertise to OSPF process another subnets like 172.30.20.0/24, 172.30.21.0/24 and so forth.

    I try to create routes via Null0 and export these to OSPF, but I find only "blackhole" routes.

    Can I export blackhole routes to OSPF? Can anybody suggest me another way to advertise /24 subnets.


  • 2.  RE: OSPF redistribute static (blackhole) routes

    Posted 05-13-2014 04:57
    Create the loopback interface.
    Assign the IP address to the loopback interface.
    Advertise the loopback vlan into OSPF.


  • 3.  RE: OSPF redistribute static (blackhole) routes

    Posted 05-13-2014 05:08
    Thank you, but...

    I have Vlan Default with IP address 172.30.0.254/16 and I can't assign IP address 172.30.20.1/24 to my loopback VLAN. It's overlaps.

    I only want to advertise /24 subnets.


  • 4.  RE: OSPF redistribute static (blackhole) routes

    Posted 05-13-2014 05:22
    May I know why you wants to do this?


  • 5.  RE: OSPF redistribute static (blackhole) routes

    Posted 05-13-2014 05:51
    Sure, I try to explain. I hope you will understand me, because my English isn't good actually.

    We have one VLAN trough all our network. It's vlan Default with 172.30.0.0/16 subnet. We've decided to split this VLAN and add some L3 routing between part of it. We don't want to change IP addressing scheme in these part, because there are a lot of devices in it.

    It's a bit difficult to explain this. Now I think we should change our IP addressing scheme.

    Sorry for my English.



  • 6.  RE: OSPF redistribute static (blackhole) routes

    Posted 05-13-2014 16:13
    Take the setup below:[attached]



    [i]

    Simple setup with all in 0.0.0.0



    SW1:

    ###



    #

    # Module vlan configuration.

    #

    create vlan black-hole

    configure vlan black-hole ipaddress 15.1.1.1 255.255.255.0

    enable ipf black-hole

    enable loopback-mode vlan black-hole



    create vlan sw1-sw2

    configure vlan sw1-sw2 ipaddress 30.30.30.2 255.255.255.252

    enable ipf sw1-sw2

    configure vlan sw1-sw2 tag 500

    configure vlan sw1-sw2 add ports 14 tagged



    #

    # Module ospf configuration.

    #

    enable ospf

    configure ospf add vlan sw1-sw2 area 0.0.0.0





    SW2:

    ####



    #

    # Module vlan configuration.

    #

    create vlan sw2-sw1 tag 500

    configure vlan sw2-sw1 ipaddress 30.30.30.1 255.255.255.252

    enable ipf sw2-sw1

    configure vlan sw2-sw1 add ports 14 tagged



    create vlan sw2-sw3 tag 20

    configure vlan sw2-sw3 ipaddress 20.20.20.1 255.255.255.252

    enable ipf sw2-sw3

    configure vlan sw2-sw3 add ports 15 tagged



    #

    # Module ospf configuration.

    #

    enable ospf

    configure ospf add vlan sw2-sw1 area 0.0.0.0

    configure ospf add vlan sw2-sw3 area 0.0.0.0





    SW3:

    ####



    #

    # Module vlan configuration.

    #



    create vlan sw3-sw2 tag 20

    configure vlan sw3-sw2 ipaddress 20.20.20.2 255.255.255.252

    enable ipf sw3-sw2

    configure vlan sw3-sw2 add ports 15 tagged



    #

    # Module ospf configuration.

    #

    enable ospf

    configure ospf add vlan sw3-sw2 area 0.0.0.0



    Now to create the so called black-hole routes, on switch1:



    SW1:

    ###

    create fdbentry 00:00:06:00:00:01 vlan "black-hole" blackhole

    configure iparp add 15.1.1.2 vr VR-Default 00:00:06:00:00:01



    configure iproute add 170.1.0.0/24 15.1.1.2

    configure iproute add 170.2.0.0/24 15.1.1.2

    configure iproute add 170.3.0.0/24 15.1.1.2

    configure iproute add 170.4.0.0/24 15.1.1.2

    configure iproute add 170.5.0.0/24 15.1.1.2

    configure iproute add 170.6.0.0/24 15.1.1.2

    configure iproute add 170.7.0.0/24 15.1.1.2

    configure iproute add 170.8.0.0/24 15.1.1.2

    configure iproute add 170.9.0.0/24 15.1.1.2

    configure iproute add 170.10.0.0/24 15.1.1.2



    enable ospf export static cost 10 type ase-type-2



    SW3:

    ####

    npi_670-2.14 # sh ipr

    Ori Destination Gateway Mtr Flags VLAN Duration

    #o2 170.1.0.0/24 20.20.20.1 10 UG-D---um--f- ospf-test 0d:0h:0m:22s

    #o2 170.2.0.0/24 20.20.20.1 10 UG-D---um--f- ospf-test 0d:0h:0m:22s

    #o2 170.3.0.0/24 20.20.20.1 10 UG-D---um--f- ospf-test 0d:0h:0m:22s

    #o2 170.4.0.0/24 20.20.20.1 10 UG-D---um--f- ospf-test 0d:0h:0m:22s

    #o2 170.5.0.0/24 20.20.20.1 10 UG-D---um--f- ospf-test 0d:0h:0m:22s

    #o2 170.6.0.0/24 20.20.20.1 10 UG-D---um--f- ospf-test 0d:0h:0m:22s

    #o2 170.7.0.0/24 20.20.20.1 10 UG-D---um--f- ospf-test 0d:0h:0m:22s

    #o2 170.8.0.0/24 20.20.20.1 10 UG-D---um--f- ospf-test 0d:0h:0m:22s

    #o2 170.9.0.0/24 20.20.20.1 10 UG-D---um--f- ospf-test 0d:0h:0m:22s

    #o2 170.10.0.0/24 20.20.20.1 10 UG-D---um--f- ospf-test 0d:0h:0m:22s



    Now obviously these will not be installed as blackhole routes but it is providing a way to send traffic destined to those subnets nowhere.



  • 7.  RE: OSPF redistribute static (blackhole) routes

    Posted 05-13-2014 16:13
    It seems a bit strange. Thank you for answer.