Junos OS

One of our team needs access to a server on subnet 172.0.46.0/24. The next-hop router is 10.0.4.2/30. A static route on their gateway has been configured to achieve the task. I want to keep the static route from being redistributed into dynamic routing protocols. Which statement is best way to achieve goal.

 

1- set routing-options static route 172.0.46.0/24 next-hop 10.0.4.2/30
2- set routing-options static route 172.0.46.0/24 next-hop 10.0.4.2/30 no-readvertise
3- set routing-options static route 172.0.46.0/24 next-hop 10.0.4.2/30 no-resolve
4- set routing-options static route 172.0.46.0/24 next-hop 10.0.4.2/30 no-redistribute

2- set routing-options static route 172.0.46.0/24 next-hop 10.0.4.2/30 no-readvertise

 

Here's an excerpt from Juniper's documentation on readvertise:

 

Static routes are eligible to be readvertised (that is, exported from the routing table into dynamic routing protocols) if a policy to do so is configured. To mark an IPv4 static route as being ineligible for readvertisement, include the no-readvertise statement.

Hi,

 

Please refer to below document which ahs good explanation with example.

 

 

Controlling Static Routes in Routing and Forwarding Tables

 

[KUDOS PLEASE! If you think I earned it!

If this solution worked for you please flag my post as an "Accepted Solution" so others can benefit..]

 

Hi Folks,

Please find some SELF-explanation on the same!

 

lab@re0_re0:r2> show configuration routing-options      <<<< static route

static {

    route 192.168.1.110/32 next-hop [ 1.1.23.2 1.1.24.2 ];

}

 

lab@re0_re0:r2> show route 192.168.1.110  

 

inet.0: 20 destinations, 20 routes (20 active, 0 holddown, 0 hidden)

+ = Active Route, - = Last Active, * = Both

 

192.168.1.110/32   *[Static/5] 01:08:46

                      to 1.1.23.2 via ge-0/0/0.23

                    > to 1.1.24.2 via ge-0/0/0.24

 

lab@re0_re0:r2> show route 192.168.1.110 extensive

 

inet.0: 20 destinations, 20 routes (20 active, 0 holddown, 0 hidden)

192.168.1.110/32 (1 entry, 1 announced)

        State: <FlashAll>

TSI:

KRT in-kernel 192.168.1.110/32 -> {1.1.24.2}

        *Static Preference: 5

                Next hop type: Router

                Address: 0x9910010

                Next-hop reference count: 2

                Next hop: 1.1.23.2 via ge-0/0/0.23

                Session Id: 0x0

                Next hop: 1.1.24.2 via ge-0/0/0.24, selected

                Session Id: 0x0

                State: <Active Int Ext>

                Age: 1:08:50

                Validation State: unverified

                Task: RT

                Announcement bits (2): 2-LDP 3-KRT   <<<< no export policy for ospf

                AS path: I

 

lab@re0_re0:r2> edit

Entering configuration mode

 

[edit]

lab@re0_re0:r2# set policy-options policy-statement static_to_ospf term 1 from protocol static

 

lab@re0_re0:r2# set policy-options policy-statement static_to_ospf term 1 then accept

 

lab@re0_re0:r2# set protocols ospf export static_to_ospf

 

[edit]

lab@re0_re0:r2# commit and-quit

commit complete

Exiting configuration mode

 

lab@re0_re0:r2> show route 192.168.1.110 extensive   

 

inet.0: 20 destinations, 20 routes (20 active, 0 holddown, 0 hidden)

192.168.1.110/32 (1 entry, 1 announced)

        State: <FlashAll>

TSI:

OSPF area : 0.0.0.0, LSA ID : 192.168.1.110, LSA type : Extern

KRT in-kernel 192.168.1.110/32 -> {1.1.24.2}

        *Static Preference: 5

                Next hop type: Router

                Address: 0x9910010

                Next-hop reference count: 2

                Next hop: 1.1.23.2 via ge-0/0/0.23

                Session Id: 0x0

                Next hop: 1.1.24.2 via ge-0/0/0.24, selected

                Session Id: 0x0

                State: <Active Int Ext>

                Age: 1:10:10

                Validation State: unverified

                Task: RT

                Announcement bits (3): 0-OSPF 2-LDP 3-KRT  <<<<<<< configured to export static to ospf

                AS path: I

 

lab@re0_re0:r2> edit

Entering configuration mode

 

lab@re0_re0:r2# set routing-options static route 192.168.1.110/32 no-ad

                                                                       ^

  no-readvertise       Don't mark route as eligible to be readvertised

 

lab@re0_re0:r2# set routing-options static route 192.168.1.110/32 no-readvertise

 

[edit]

lab@re0_re0:r2# commit and-quit

commit complete

Exiting configuration mode

 

lab@re0_re0:r2> show route 192.168.1.110 extensive   

 

inet.0: 20 destinations, 20 routes (20 active, 0 holddown, 0 hidden)

192.168.1.110/32 (1 entry, 1 announced)

        State: <FlashAll>

TSI:

KRT in-kernel 192.168.1.110/32 -> {1.1.24.2}

        *Static Preference: 5

                Next hop type: Router

                Address: 0x9910010

                Next-hop reference count: 2

                Next hop: 1.1.23.2 via ge-0/0/0.23

                Session Id: 0x0

                Next hop: 1.1.24.2 via ge-0/0/0.24, selected

                Session Id: 0x0

                State: <Active NoReadvrt Int Ext>

                Age: 1:10:40

                Validation State: unverified

                Task: RT

                Announcement bits (2): 2-LDP 3-KRT  <<<<<<<< No more advertisement to OSPF

                AS path: I

 

lab@re0_re0:r2>