Routing

Hi all,

 

I would like to know how to configured a RIP to export as a default gateway 0.0.0.0/0 and how to do with OSPF too.

 

 

Rtoribio@SABAJUNIPER# show policy-options policy-statement RIP

term 1 {    from protocol [ rip static direct ];   

then accept;

}

Rtoribio@SABAJUNIPER# show protocols rip group PROPAGACION_RIP

export RIP;

neighbor fxp0.0;

 

 

Local route:

                    

Rtoribio@SABAJUNIPER> show route table inet.0

 

inet.0: 9 destinations, 10 routes (9 active, 0 holddown, 0 hidden)

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

 0.0.0.0/0          *[Static/250] 00:00:32                   

> to 10.0.0.2 via fxp0.0

10.0.0.0/24        *[Direct/0] 4d 18:59:22

                    > via fxp0.0

10.0.0.1/32        *[Local/0] 4d 19:03:44

                      Local via fxp0.0

10.5.0.0/24        *[RIP/100] 2d 17:49:45, metric 2, tag 0

                    > to 10.0.0.2 via fxp0.0

172.22.0.0/16      *[Static/250] 2d 18:01:23

                    > to 172.22.16.1 via fxp1.0

172.22.16.0/24     *[Direct/0] 2d 20:17:46

                    > via fxp1.0

                    [Static/250] 2d 18:59:14

                    > to 172.22.16.1 via fxp1.0

172.22.16.160/32   *[Local/0] 2d 20:18:14

                      Local via fxp1.0

195.168.1.0/24     *[RIP/100] 2d 17:46:18, metric 3, tag 0

                    > to 10.0.0.2 via fxp0.0

200.10.25.0/24     *[Static/250] 2d 23:16:07

                    > to 10.0.0.2 via fxp0.0

224.0.0.9/32       *[RIP/100] 2d 18:01:23, metric 1

  MultiRecv

 

 

at the router it can not see, the default last resort.

 

LAB_TOC_R2#

 

Gateway of last resort is not set ( is not set ???)

 

     172.22.0.0/16 is variably subnetted, 2 subnets, 2 masks

R       172.22.16.0/24 [120/1] via 10.0.0.1, 00:00:09, FastEthernet0/0

R       172.22.0.0/16 [120/1] via 10.0.0.1, 00:00:09, FastEthernet0/0

     10.0.0.0/24 is subnetted, 2 subnets

C       10.0.0.0 is directly connected, FastEthernet0/0

C       10.5.0.0 is directly connected, FastEthernet0/1

R    195.168.1.0/24 [120/1] via 10.5.0.2, 00:00:22, FastEthernet0/1

 

Regards,

Raul Toribio

Hi Raul,

Can you please provide output of "show route 0/0 exact detail" on the local router from where you are trying to advertise this default?

Regards
Surya Prakash

Hi surya,

 

I want to advertised (juniper) 0.0.0.0/0 via fxp0 (next-hop 10.0.0.2) in the other router (cisco) it couldnt get default router.

 

 

Rtoribio@SABAJUNIPER# show routing-options static

defaults {

    readvertise;

    preference 250;

}

route 200.10.25.0/24 next-hop 10.0.0.2;

route 172.22.16.0/24 {

    next-hop 172.22.16.1;

    passive;

}

route 172.22.0.0/16 {

    next-hop 172.22.16.1;

    passive;

}

route 0.0.0.0/0 next-hop 10.0.0.2;

 

Rtoribio@SABAJUNIPER# run show route 0.0.0.0

 

inet.0: 10 destinations, 11 routes (10 active, 0 holddown, 0 hidden)

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

 

0.0.0.0/0          *[Static/250] 00:49:09

                    > to 10.0.0.2 via fxp0.0

 

 

Regards,

RT

Hi Raul,

I just wanted to confirm if the route state is in "no-advertise" mode, however from the configs it doesn't seem to be the case.

To confirm what the router is advertising to other router, we may need "show route advertising-protocol rip <neighbor_ip> detail".

Regards
Surya Prakash

Hi Surya,

 

is clear went i showed with the next-hop 10.0.0.2

 

[edit]

Rtoribio@SABAJUNIPER# ...ing-protocol rip 10.0.0.2 detail

 

[edit]

Rtoribio@SABAJUNIPER# ...ing-protocol rip 10.0.0.2 detail

 

with the local-ip 10.0.0.1 is

 

[edit]

Rtoribio@SABAJUNIPER# run show route advertising-protocol rip 10.0.0.1

 

inet.0: 10 destinations, 11 routes (10 active, 0 holddown, 0 hidden)

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

 

0.0.0.0/0          *[Static/250]01:13:47

                    > to 10.0.0.2 via fxp0.0

172.22.0.0/16      *[Static/250] 2d19:28:29

                    > to 172.22.16.1 via fxp1.0

172.22.16.0/24     *[Direct/0] 2d21:44:52

                    > via fxp1.0

                    [Static/250] 2d20:26:20

                    > to 172.22.16.1 via fxp1.0

200.10.25.0/24     *[Static/250] 3d00:43:13

                    > to 10.0.0.2 via fxp0.0

 

Regards,

RT

Hi Raul.

My bad, actually the show command should had "local_ip" instead of "neighbor_ip".

From this output, it is clear that juniper router is advertising default route 0/0 to the adjacent router.

Regards
Surya Prakash

the other router (cisco) should had (accepted) the default router (on last resort) but isnt there. what i configured bad on my juniper-advertising?? if my advertising 0/0 to next-hop is ok, why i can not see it.

 

 

LAB_TOC_R2#sho ip ro

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

       E1 - OSPF external type 1, E2 - OSPF external type 2

       i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area

       * - candidate default, U - per-user static route, o - ODR

       P - periodic downloaded static route

 

Gateway of last resort is not set

 

     172.22.0.0/16 is variably subnetted, 2 subnets, 2 masks

R       172.22.16.0/24 [120/1] via 10.0.0.1, 00:00:03, FastEthernet0/0

R       172.22.0.0/16 [120/1] via 10.0.0.1, 00:00:03, FastEthernet0/0

     10.0.0.0/24 is subnetted, 2 subnets

C       10.0.0.0 is directly connected, FastEthernet0/0

C       10.5.0.0 is directly connected, FastEthernet0/1

R    195.168.1.0/24 [120/1] via 10.5.0.2, 00:00:24, FastEthernet0/1

 

LAB_TOC_R2#

 

Regards,

RT

Your default route is pointing out of the fxp0.0 interface.  The fxp0.0 is a nontransitive interface, aka not in the forwarding path.  Even if the route is recieved it will be unuseable. 

 

I'm a bit rusty on IOS, but you should be able to debug rip and see why the route is being rejected by the cisco router.

i run the monitor traffic, and i recieved/send, could be related with?

 

0.9.router: RIPv2, Response, length: 104

21:06:04.251289 Out IP truncated-ip - 72 bytes missing! 10.0.0.1.router > 224.0.

0.9.router: RIPv2, Response, length: 104

21:06:06.719326  In

21:06:16.719013  In

21:06:26.499587  In IP truncated-ip - 12 bytes missing! 10.0.0.2.router > 224.0.

0.9.router: RIPv2, Response, length: 44

21:06:26.718712  In

21:06:32.762727 Out IP truncated-ip - 72 bytes missing! 10.0.0.1.router > 224.0.

0.9.router: RIPv2, Response, length: 104

21:06:36.726270  In

21:06:36.727325  In 0:d:ed:61:49:50 > 1:0:c:cc:cc:cc SNAP Unnumbered, ui, Flags

[Command], length 60

21:06:46.722216  In

21:06:53.435771  In IP truncated-ip - 12 bytes missing! 10.0.0.2.router > 224.0.

0.9.router: RIPv2, Response, length: 44

21:06:56.721955  In

21:07:01.789154 Out IP truncated-ip - 72 bytes missing! 10.0.0.1.router > 224.0.

 

Regards,

RT

We know that the Juniper is sending the route.  What we don't know is why the cisco is not processing/accepting the route.  We will need to run debug for RIP on the IOS device.

 

I'm begining to think you may have a weird split-horizon problem - the debug will tell.  The next hop for the 0/0 route is 10.0.0.2.  The Cisco router knows about the 10.0.0.0/24 network - "C       10.0.0.0 is directly connected, FastEthernet0/0" - as directly connected.

 

Again, debug will tell.  I'm pretty sure if you change the 0/0 route on the Juniper to have a next-hop of discard (for testing purposes), the Cisco will recieve the default route properly.  This would confirm my split-horizon suspisions (which can be confirmed by a cisco IOS debug).

Hi Jwparks,

 

i thougth at the begin, firts am gonna try to change with a next-hop dircard and then with a different Net between

Juniper-----Cisco#1Cisco#1-------Cisco#2

Network: 10.0.0.0/24Network: 10.5.0.0/24(they are different)

10.0.0.1-----10.0.0.2 10.5.0.1--------10.5.0.2

 

i tryed to debug ip rip, but my cisco router can't return anything.

 

Regards,

Hi Jwparks,

 

Thank you,

you were rigth, when i changed to discard, my ciscos could accept  a default route. even exist a split horizon it should accept the default however the packet can not go out on that interface.

 

LAB_TOC_R1#sho ip ro

 

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

       D - EIGRP, EX - EIGRP external, O -OSPF,IA - OSPF inter area

       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

       E1 - OSPF external type 1, E2 - OSPF external type 2

       i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area

       * - candidate default, U - per-user static route, o - ODR

       P - periodic downloaded static route

 

Gateway of last resort is 10.5.0.1 to network 0.0.0.0

 

     172.22.0.0/16 is variably subnetted, 2 subnets, 2 masks

R       172.22.16.0/24 [120/2] via 10.5.0.1,00:00:22, FastEthernet0/0

R       172.22.0.0/16 [120/2] via 10.5.0.1,00:00:22, FastEthernet0/0

     10.0.0.0/24 is subnetted, 2 subnets

R       10.0.0.0 [120/1] via 10.5.0.1,00:00:22, FastEthernet0/0

C       10.5.0.0 is directly connected, FastEthernet0/0

C    195.168.1.0/24 is directly connected, FastEthernet0/1

R*   0.0.0.0/0 [120/2] via 10.5.0.1,00:00:22, FastEthernet0/0

 

LAB_TOC_R1#

 

LAB_TOC_R2#sho ip ro

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

       D - EIGRP, EX - EIGRP external, O -OSPF,IA - OSPF inter area

       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

       E1 - OSPF external type 1, E2 - OSPF external type 2

       i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area

       * - candidate default, U - per-user static route, o - ODR

       P - periodic downloaded static route

 

Gateway of last resort is 10.0.0.1 to network 0.0.0.0

 

     172.22.0.0/16 is variably subnetted, 2 subnets, 2 masks

R       172.22.16.0/24 [120/1] via 10.0.0.1,00:00:16, FastEthernet0/0

R       172.22.0.0/16 [120/1] via 10.0.0.1,00:00:16, FastEthernet0/0

     10.0.0.0/24 is subnetted, 2 subnets

C       10.0.0.0 is directly connected, FastEthernet0/0

C       10.5.0.0 is directly connected, FastEthernet0/1

R    195.168.1.0/24 [120/1] via 10.5.0.2,00:00:29, FastEthernet0/1

R*   0.0.0.0/0 [120/1] via 10.0.0.1,00:00:16, FastEthernet0/0

 

LAB_TOC_R2#

It is wierd, but I think that was the problem.  You can try disabling split-horizon on the Cisco by adding something like "no ip split-horizon"** in the interface pointing at the Juniper.  See if that works.

 

**not sure of the exact command

but what should be the correct way, to changed the networks ?? because those router has not summarization advertisment: 10.0.0.0/24 is different to 10.5.0.0/24

Hi,

    What I understand so far is that, you want to export a RIP default route to adjacent cisco router, so that Juniper Router can act as a default gateway. Is that correct?

In that case, you can have define a aggregate route and advertise the same using RIP export policy.

[edit]
regress@huntington# show routing-options aggregate
route 0.0.0.0/0;

[edit]
regress@huntington# show policy-options policy-statement rip-export
term 1 {
    from {
        protocol aggregate;
        route-filter 0.0.0.0/0 exact;
    }
    then accept;
}


Regards
Surya Prakash

Hi Surya,

 

That's correct. i want to export default route from my juniper router. that is other way to do it ?? could solve the suspicious split horinzon, now.