Solved: Re: I need help in creating a route

hfakoor222 · ‎05-05-2022

Below is a lab topology where I've define OSPF on all except R2 router, top right edge. Everything has connectivity except to R2.

I want to have D1 and D2 ping R2 by using a default route. I will post the configurations, For switches: ip routing is turned on, D1 D2 interfaces are defined 'no switchport'

and A1 has a default gateway to R1

ip default-gateway 10.10.0.1

When I run a traceroute from the D1 and D2 Switches they arrive at R1 and get dropped

Can someone help me define a statric route on R1 to forward traffic to R2

Here is addressing table, with configurations to follow

R1 f0/0 10.10.0.1

f1/0 192.168.55.1

R2 f0/0 192.168.5.2

A1 Int Vlan 1: 10.10.0.4

ip default-gateway 10.10.0.1

D1 G0/1 10.10.0.3

no switchport

D2 g0/2 10.10.0.2

no switchport

R1 Router Config

hostname R1
!
boot-start-marker
boot-end-marker
!
logging message-counter syslog
!
no aaa new-model
clock timezone EXT -5
ip source-route
no ip icmp rate-limit unreachable
ip cef
!
!
!
!
no ip domain lookup
no ipv6 cef
!
multilink bundle-name authenticated
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
archive
log config
hidekeys
!
!
!
!
!
ip tcp synwait-time 5
!
!
!
!
interface FastEthernet0/0
ip address 10.10.0.1 255.255.255.0
duplex half
!
interface FastEthernet1/0
ip address 192.168.55.1 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet1/1
no ip address
shutdown
duplex auto
speed auto
!
router ospf 123
log-adjacency-changes
network 10.10.0.0 0.0.0.255 area 0
network 192.168.55.0 0.0.0.255 area 0
!
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 192.168.55.2
no ip http server
no ip http secure-server
!
!
!
no cdp log mismatch duplex
!
!
!
!
!
!
control-plane
!
!
!
!
!
!
!
gatekeeper
shutdown
!
!
line con 0
exec-timeout 0 0
privilege level 15
logging synchronous
stopbits 1
line aux 0
exec-timeout 0 0
privilege level 15
logging synchronous
stopbits 1
line vty 0 4
login
!
ntp server 10.10.0.1 key 12556
end

A1 Switch Config

urrent configuration : 3184 bytes
!
! Last configuration change at 11:46:13 EST Thu May 5 2022
!
version 15.2
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
service compress-config
!
hostname Switch
!
boot-start-marker
boot-end-marker
!
!
!
no aaa new-model
clock timezone EST -5 0
!
!
!
!
!
!
!
!
ip cef
no ipv6 cef
!
!
!
spanning-tree mode rapid-pvst
spanning-tree extend system-id
!
vlan internal allocation policy ascending
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface GigabitEthernet0/0
media-type rj45
negotiation auto
!
interface GigabitEthernet0/1
media-type rj45
negotiation auto
!
interface GigabitEthernet0/2
media-type rj45
negotiation auto
!
interface GigabitEthernet0/3
media-type rj45
negotiation auto
!
interface GigabitEthernet1/0
media-type rj45
negotiation auto
!
interface GigabitEthernet1/1
media-type rj45
negotiation auto
!
interface GigabitEthernet1/2
media-type rj45
negotiation auto
!
interface Vlan1
ip address 10.10.0.4 255.255.255.0
ntp broadcast
!
router ospf 123
network 10.10.0.0 0.0.0.255 area 0
!
ip default-gateway 10.10.0.1
ip forward-protocol nd
!
no ip http server
no ip http secure-server
!
ip route 192.168.55.0 255.255.255.0 10.10.0.1
!
!
!
!
!
control-plane
!

line con 0
exec-timeout 0 0
line aux 0
line vty 0 4
!
ntp server 10.10.0.1 key 12556
!'

D1 Switch Config

Current configuration : 3184 bytes
!
! Last configuration change at 11:46:13 EST Thu May 5 2022
!
version 15.2
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
service compress-config
!
hostname Switch
!
boot-start-marker
boot-end-marker
!
!
!
no aaa new-model
clock timezone EST -5 0
!
!
!
!
!
!
!
!
ip cef
no ipv6 cef
!
!
!
spanning-tree mode rapid-pvst
spanning-tree extend system-id
!
vlan internal allocation policy ascending
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface GigabitEthernet0/0
media-type rj45
negotiation auto
!
interface GigabitEthernet0/1
media-type rj45
negotiation auto
!
interface GigabitEthernet0/2
media-type rj45
negotiation auto
!
interface GigabitEthernet0/3
media-type rj45
negotiation auto
!
interface GigabitEthernet1/0
media-type rj45
negotiation auto
!
interface GigabitEthernet1/1
media-type rj45
negotiation auto
!
interface GigabitEthernet1/2
media-type rj45
negotiation auto
!
interface Vlan1
ip address 10.10.0.4 255.255.255.0
ntp broadcast
!
router ospf 123
network 10.10.0.0 0.0.0.255 area 0
!
ip default-gateway 10.10.0.1
ip forward-protocol nd
!
no ip http server
no ip http secure-server
!
ip route 192.168.55.0 255.255.255.0 10.10.0.1

!

control-plane

!
!
line con 0
exec-timeout 0 0
line aux 0
line vty 0 4
!
ntp server 10.10.0.1 key 12556

!

My Switch D2 configuration uses

ip route 0.0.0.0 0.0.0.0 10.10.0.1 in place of the D1 ip route, and has same results of connectivity up until 192.168.55.1 f1/0 of router R1 and cannot reach Router R2

So I am assuming a static route in R1 is what is needed for me to direct traffic to R2

Basic static routing is not something I've active practiced and I would like help with thsi

Any suggestions?

MHM Cisco World · ‎05-05-2022

R1 have
static route toward R2
R1 is ASBR and redistribute this static route into OSPF
this make ALL router in OSPF know how reach R2

in R2
config default route toward R1

View solution in original post

MHM Cisco World · ‎05-05-2022

No topology attach ?

David Ruess · ‎05-05-2022

Hello,

Yes @MHM Cisco World stated a topology diagram would be good.

Another thing to note:

Understanding terminology will also help you when it comes to configuring routes out for getting to network devices.

A Default route states if you don't know where to send it, use the default route I have configured. It is usually configured like 0.0.0.0 0.0.0.0 <exit interface/next hop IP>

A static route a manually configured route that points you in the right direction to get to a specific route. A static route can be a default route but doesn't always have to be.

Without seeing a diagram what I would suggest is on every router that needs to reach R2 a static route of 192.168.55.0 255.255.255.0 <next hop of neighbor router>

Doing this with the next hop of each router of the link pointing to R2 (a diagram could help explain this better)

On R2 is where you would need the default route of 0.0.0.0 0.0.0.0 <R2s next hop into the network>

Hope that helps

-David

hfakoor222 · ‎05-05-2022

I hadn't even thought of this

Without seeing a diagram what I would suggest is on every router that needs to reach R2 a static route of 192.168.55.0 255.255.255.0 <next hop of neighbor router>

I may try it now and see what happens.

Thank you for the help.

balaji.bandi · ‎05-05-2022

as per the cnfig every router running OSPF, they learn the routes from each other

Make sure ip routing enabled - Make sure R2 have static route towards R1

ip route 0.0.0.0 0.0.0.0 192.168.55.1

post below output from all devices :

show ip route

show IP interface brief

show ip ospf neigh

from R2 are you able to ping - 192.168.55.1

can you post R2 config also.

BB

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hfakoor222 · ‎05-05-2022

I am able to ping R1 from R2

I've enable IP routing on all switches

here is the topology

I can ping to f1/0 interface of R1 from A1, and not to f0/0 interface of R2

A1

Switch(config)#do ping 192.168.55.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.55.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 3/6/8 ms
Switch(config)#do ping 192.168.55.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.55.2, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)

I want to accomplish this without OSPF and by defining default/static routes

The traceroute from A1 reaches 10.10.0.1 as it is the default gateway and gets dropped

*May 5 18:57:16.825: %SYS-5-CONFIG_I: Configured from console by console
Switch#traceroute 192.168.55.2
Type escape sequence to abort.
Tracing the route to 192.168.55.2
VRF info: (vrf in name/id, vrf out name/id)
1 10.10.0.1 16 msec 5 msec 5 msec
2 * * *
3 * * *

here is A1 Running Config

Switch#show running-config
Building configuration...

Current configuration : 3216 bytes
!
! Last configuration change at 13:57:16 EST Thu May 5 2022
!
version 15.2
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
service compress-config
!
hostname Switch
!
boot-start-marker
boot-end-marker
!
!
!
no aaa new-model
clock timezone EST -5 0
!
!
!
!
!
!
!
!
ip cef
no ipv6 cef
!
!
!
spanning-tree mode rapid-pvst
spanning-tree extend system-id
!
vlan internal allocation policy ascending
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface GigabitEthernet0/0
media-type rj45
negotiation auto
!
interface GigabitEthernet0/1
media-type rj45
negotiation auto
!
interface GigabitEthernet0/2
media-type rj45
negotiation auto
!
interface GigabitEthernet0/3
media-type rj45
negotiation auto
!
interface GigabitEthernet1/0
media-type rj45
negotiation auto
!
interface GigabitEthernet1/1
media-type rj45
negotiation auto
!
interface GigabitEthernet1/2
media-type rj45
negotiation auto
!
interface Vlan1
ip address 10.10.0.4 255.255.255.0
ntp broadcast
!
router ospf 123
network 10.10.0.0 0.0.0.255 area 0
!
ip default-gateway 10.10.0.1
ip forward-protocol nd
!
no ip http server
no ip http secure-server
!
ip route 192.168.55.0 255.255.255.0 10.10.0.1
!
!
!
!
!
control-plane

I believe I need a route defined on R1 and I don't know how to do that to get traffic to go to R2

here is R1's configuration

with:

ip route 0.0.0.0 0.0.0.0 192.168.55.2

R1#show running-config
Building configuration...

Current configuration : 1289 bytes
!
upgrade fpd auto
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R1
!
boot-start-marker
boot-end-marker
!
logging message-counter syslog
!
no aaa new-model
clock timezone EXT -5
ip source-route
no ip icmp rate-limit unreachable
ip cef
!
!
!
!
no ip domain lookup
no ipv6 cef
!
multilink bundle-name authenticated
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
archive
log config
hidekeys
!
!
!
!
!
ip tcp synwait-time 5
!
!
!
!
interface FastEthernet0/0
ip address 10.10.0.1 255.255.255.0
duplex half
!
interface FastEthernet1/0
ip address 192.168.55.1 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet1/1
no ip address
shutdown
duplex auto
speed auto
!
router ospf 123
log-adjacency-changes
network 10.10.0.0 0.0.0.255 area 0
network 192.168.55.0 0.0.0.255 area 0
!
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 192.168.55.2
no ip http server
no ip http secure-server
!
!
!
no cdp log mismatch duplex
!
!
!
!
!
!
control-plane
!
!
!
!
!
!
!
gatekeeper
shutdown
!
!
line con 0
exec-timeout 0 0
privilege level 15
logging synchronous
stopbits 1
line aux 0
exec-timeout 0 0
privilege level 15
logging synchronous
stopbits 1
line vty 0 4
login
!
ntp server 10.10.0.1 key 12556

here is R1 routing table

Switch A1 Routing Table

And Configuration for R2

And Configuration of R2 Router

2#sh running-conf
Building configuration...

Current configuration : 1103 bytes
!
upgrade fpd auto
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R2
!
boot-start-marker
boot-end-marker
!
logging message-counter syslog
!
no aaa new-model
ip source-route
no ip icmp rate-limit unreachable
ip cef
!
!
!
!
no ip domain lookup
no ipv6 cef
!
multilink bundle-name authenticated
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
archive
log config
hidekeys
!
!
!
!
!
ip tcp synwait-time 5
!
!
!
!
interface FastEthernet0/0
ip address 192.168.55.2 255.255.255.0
duplex half
!
interface FastEthernet1/0
no ip address
shutdown
duplex auto
speed auto
!
interface FastEthernet1/1
no ip address
shutdown
duplex auto
speed auto
!
ip default-gateway 192.168.55.1
ip forward-protocol nd
no ip http server
no ip http secure-server
!
!
!
no cdp log mismatch duplex
!
!
!
!
!
!
control-plane
!
!
!
!
!
!
!
gatekeeper
shutdown
!
!
line con 0
exec-timeout 0 0
privilege level 15
logging synchronous
stopbits 1
line aux 0
exec-timeout 0 0
privilege level 15
logging synchronous
stopbits 1
line vty 0 4
login
!
end

I just recognized R1 configuration includes :

gatekeeper
shutdown

MHM Cisco World · ‎05-05-2022

R1 have
static route toward R2
R1 is ASBR and redistribute this static route into OSPF
this make ALL router in OSPF know how reach R2

in R2
config default route toward R1

hfakoor222 · ‎05-05-2022

in R2
config default route toward R1

Thank you this worked perfectly. I will try redistributing into OSPF and removing this route to see if it has same results.

MHM Cisco World · ‎05-05-2022

""for ICMP echo""
R1 have
static route toward R2
R1 is ASBR and redistribute this static route into OSPF
this make ALL router in OSPF know how reach R2

""for ICMP echo reply""
in R2
config default route toward R1

David Ruess · ‎05-05-2022

If you HAVE to use static routes try the following:

It looks like you only need a static route on R2 to "get out to the network"

R2: ip route 0.0.0.0 0.0.0.0 192.168.55.1

everything else is connected to the 10.10.0.0 network

-David

hfakoor222 · ‎05-05-2022

I have one last question

Would someone explain to me how having a default route defined from R2 to R1 helped map traffic from R1 to R2

I mean doesn't R1 already know how to get to R2?

I am missing the logic here of how this works.

balaji.bandi · ‎05-05-2022

R1 knows how to reach to R2, But R2 do not have any visibility of routes

remove that static route towards R1 and check show IP route

BB

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hfakoor222 · ‎05-05-2022

But I still don't understand how a route from R2 to R1 makes it possible to reach from R1 to R2 if R1 already has a route. Actually as I'm typing this maybe something to do with echo-reply?

David Ruess · ‎05-05-2022

This depends on the interface you are pinging. Plus you OSPF enabled for the 192.168.55.0 route and routes a dynamically learned. R2 doesn’t have this capability. So if you try to ping R2 you know how to get there but R2 has no idea how to get back. So I’m this case a default route configured on R2 saying go to R1 if you don’t know how to get somewhere and let him take care of it since he knows the routes.