Route problem

[roberto.londono]

I have rotuer 3825  172.16.11.1 connect with 1811  172.16.11.200.

I did sh ip route. here is result.

  10.0.1.0/24 [110/2] via 172.16.11.1, 00:27:26, FastEthernet1

    10.1.1.0/24 [110/3] via 172.16.11.1, 00:27:26, FastEthernet1

    10.2.1.0/24 [110/4] via 172.16.11.1, 00:27:26, FastEthernet1

    10.3.1.0/24 [110/4] via 172.16.11.1, 00:27:26, FastEthernet1

    10.4.1.0/24 [110/4] via 172.16.11.1, 00:27:26, FastEthernet1

    10.7.1.0/24 [110/4] via 172.16.11.1, 00:00:06, FastEthernet1

    10.9.1.0/24 [110/4] via 172.16.11.1, 00:27:26, FastEthernet1

I have machine1 into the   network 10.200.1.0  ping 10.3.1.110  and other ping 10.2.1.110  and it is ok.

but  When I connet service provider in my sw and active router 172.16.11.7.

I did again sh ip route 172.16.11.200 here is result.

O        10.2.1.0/24 [110/4] via 172.16.11.7, 00:00:04, FastEthernet1

                     [110/4] via 172.16.11.1, 00:25:53, FastEthernet1

O        10.3.1.0/24 [110/4] via 172.16.11.7, 00:00:04, FastEthernet1

                     [110/4] via 172.16.11.1, 00:25:53, FastEthernet1

O        10.4.1.0/24 [110/4] via 172.16.11.7, 00:00:04, FastEthernet1

                     [110/4] via 172.16.11.1, 00:25:53, FastEthernet1

O        10.7.1.0/24 [110/2] via 172.16.11.7, 00:00:04, FastEthernet1

O        10.9.1.0/24 [110/4] via 172.16.11.7, 00:00:04, FastEthernet1

                     [110/4] via 172.16.11.1, 00:25:53, FastEthernet1

Now machine1 lost ping betwen 10.3.1.110  but the ping 10.2.1.110 is ok.

I believe my provider have problem his topology or I need to do some in my rotuer cofiguration.

Thanks help it problem.

Roberto.

[tony.henry_2]

Roberto,

I think there is more to the network than what youv'e documented thus making it hard to analyse and help out with.

Where do the 10.3.1.0/24 and 10.2.1.0/24 subnets actually connect to the network? Why doesn't 10.200.1.0 appear in your routing table?

My initial thoughts are that your 3825 has an alternate connection to the 10.7.1.0/24 subnet. Trace routes will be useful as you could then isolate where the fault is occuring.

HTH

Tony

[roberto.londono]

Hi Tony

Thanks for your answer and help.

Where do the 10.3.1.0/24 and 10.2.1.0/24 subnets actually connect to the network? Why doesn't 10.200.1.0 appear in your routing table?

Sorry I cut is it. It  is show in my route table. It is connect same switch 3825 10.200.1.0 1811 router.  It is test router it have to do test 10.2.1.0 or 10.3.1.0  it are 1811 but it are other location.

“My initial thoughts are that your 3825 has an alternate connection to the 10.7.1.0/24 subnet. Trace routes will be useful as you could then isolate where the fault is occurring”

Yes you are correct. 10.3.1.0. 10.2.1.0 has other route is 172.16.10.0 network it is by other provider.

Any 1811 has this configuration

track 1 ip sla 1 reachability

delay down 15 up 60

!

track 2 ip sla 2 reachability

delay down 15 up 60

interface FastEthernet0

description PIN WAN

ip address 172.16.10.2 255.255.255.0

ip nat inside

ip virtual-reassembly

ip ospf cost 1

ip ospf priority 100

delay 10

duplex auto

speed auto

!

!

interface FastEthernet1

description EOT WAN

ip address 172.16.11.2 255.255.255.0

ip nat inside

ip virtual-reassembly

ip ospf cost 6

ip ospf priority 80

delay 12

duplex auto

speed auto

interface Vlan1

description $ES_LAN$

ip address 10.2.1.1 255.255.255.0

ip nat inside

ip virtual-reassembly

!

router ospf 2

log-adjacency-changes

network 10.2.1.0 0.0.0.255 area 0

network 172.16.10.0 0.0.0.255 area 0

network 172.16.11.0 0.0.0.255 area 0

ip sla 1

icmp-echo 172.16.10.1

frequency 5000

ip sla schedule 1 life forever start-time now

ip sla 2

icmp-echo 172.16.11.1

frequency 500

ip sla schedule 2 life forever start-time now

The problem I have is when I tried to conencet my second path I mark is like Cloud becouse it is provider to other company I will call 172.16.11.0 is EOT and  172.16.10.0 is call PIN.

All the router are configurate same area 0

[tony.henry_2]

Roberto,

From machine1, trace route to 10.2.1.1 and 10.3.1.1 and paste the results back here.

Thanks

Tony

[roberto.londono]

Tony

Here is trace

first trace 10.3.1.110 is ok I not conect my provider (Cloud) EOT.

second trace 10.3.1.110 I lost conection. in this case I conect my provider.

there route 10.2.1.1 I no lost the conection.

Roberto

[tony.henry_2]

Roberto,

From this I can see that 10.12.5.209 starts advertising that it has a better route for 10.3.1.0 after connection of the new provider. The packet is getting lost after 10.5.10.20. which may mean that it'll fail altogether or the router doesn't know how to get back to machine1's subnet.

You need to look at the routing table of 10.200.1.1 and determine what the cost is for 10.3.1.0 with and without the new provider. You could then adjust the cost accordingly to favour the prefered route

I haven't got a full enough picture of the whole network to do so and suggest the actual config.

Tony

[roberto.londono]

Tony

Here is complete ip route table. but here I have question

how can change cost 172.16.11.1 and 172.16.11.7 into route 10.200.1.1.

Farm#sh ip route

Codes: L - local, 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, su - IS-IS summary, 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, + - replicated route

Gateway of last resort is 172.16.11.1 to network 0.0.0.0

S*    0.0.0.0/0 [1/0] via 172.16.11.1

      10.0.0.0/8 is variably subnetted, 18 subnets, 2 masks

O        10.0.1.0/24 [110/2] via 172.16.11.1, 01:05:05, FastEthernet1

O        10.1.1.0/24 [110/3] via 172.16.11.1, 01:05:05, FastEthernet1

O        10.2.1.0/24 [110/4] via 172.16.11.7, 01:05:05, FastEthernet1

                     [110/4] via 172.16.11.1, 01:05:05, FastEthernet1

O        10.3.1.0/24 [110/4] via 172.16.11.7, 01:05:05, FastEthernet1

                     [110/4] via 172.16.11.1, 01:05:05, FastEthernet1

O        10.4.1.0/24 [110/4] via 172.16.11.7, 01:05:05, FastEthernet1

                     [110/4] via 172.16.11.1, 01:05:05, FastEthernet1

O        10.7.1.0/24 [110/2] via 172.16.11.7, 01:05:05, FastEthernet1

O        10.7.1.0/24 [110/2] via 172.16.11.7, 01:05:05, FastEthernet1

O        10.9.1.0/24 [110/4] via 172.16.11.7, 01:05:05, FastEthernet1

                     [110/4] via 172.16.11.1, 01:05:05, FastEthernet1

O        10.10.1.0/24 [110/4] via 172.16.11.7, 01:05:05, FastEthernet1

                      [110/4] via 172.16.11.1, 01:05:05, FastEthernet1

O        10.12.1.0/24 [110/4] via 172.16.11.7, 01:05:11, FastEthernet1

                      [110/4] via 172.16.11.1, 01:05:11, FastEthernet1

O        10.13.1.0/24 [110/4] via 172.16.11.7, 01:05:12, FastEthernet1

                      [110/4] via 172.16.11.1, 01:05:12, FastEthernet1

O        10.14.1.0/24 [110/4] via 172.16.11.7, 01:05:12, FastEthernet1

                      [110/4] via 172.16.11.1, 01:05:12, FastEthernet1

O        10.15.1.0/24 [110/4] via 172.16.11.7, 01:05:12, FastEthernet1

                      [110/4] via 172.16.11.1, 01:05:12, FastEthernet1

O        10.20.1.0/24 [110/4] via 172.16.11.7, 01:05:13, FastEthernet1

                      [110/4] via 172.16.11.1, 01:05:13, FastEthernet1

O        10.25.1.0/24 [110/4] via 172.16.11.7, 01:05:13, FastEthernet1

                      [110/4] via 172.16.11.1, 01:05:13, FastEthernet1

O        10.100.1.0/24 [110/4] via 172.16.11.7, 01:05:13, FastEthernet1

                       [110/4] via 172.16.11.1, 01:05:13, FastEthernet1

O        10.100.2.0/24 [110/4] via 172.16.11.7, 01:05:14, FastEthernet1

                       [110/4] via 172.16.11.1, 01:05:14, FastEthernet1

C        10.200.1.0/24 is directly connected, Vlan1

L        10.200.1.1/32 is directly connected, Vlan1

      172.16.0.0/16 is variably subnetted, 3 subnets, 2 masks

O        172.16.10.0/24 [110/3] via 172.16.11.7, 01:05:15, FastEthernet1

                        [110/3] via 172.16.11.1, 01:05:15, FastEthernet1

C        172.16.11.0/24 is directly connected, FastEthernet1

L        172.16.11.200/32 is directly connected, FastEthernet1

O     192.168.1.0/24 [110/4] via 172.16.11.7, 01:05:18, FastEthernet1

                     [110/4] via 172.16.11.1, 01:05:18, FastEthernet1

I did other test. 172.16.11.1 has other conection to internet I disable it when I did it I lost comunication

here is trace.

Here is

sh ip ospf int

FastEthernet1 is up, line protocol is up

  Internet Address 172.16.11.200/24, Area 0

  Process ID 30, Router ID 172.16.11.200, Network Type BROADCAST, Cost: 1

  Topology-MTID    Cost    Disabled    Shutdown      Topology Name

        0           1         no          no            Base

  Transmit Delay is 1 sec, State BDR, Priority 1

  Designated Router (ID) 209.237.88.79, Interface address 172.16.11.1

  Backup Designated router (ID) 172.16.11.200, Interface address 172.16.11.200

  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5

    oob-resync timeout 40

    Hello due in 00:00:05

  Supports Link-local Signaling (LLS)

  Cisco NSF helper support enabled

  IETF NSF helper support enabled

  Index 3/3, flood queue length 0

  Next 0x0(0)/0x0(0)

  Last flood scan length is 0, maximum is 2

  Last flood scan time is 0 msec, maximum is 4 msec

  Neighbor Count is 2, Adjacent neighbor count is 2

    Adjacent with neighbor 172.16.10.7

    Adjacent with neighbor 209.237.88.79  (Designated Router)

  Suppress hello for 0 neighbor(s)

FastEthernet0 is down, line protocol is down

  Internet Address 172.16.10.200/24, Area 0

FastEthernet0 is down, line protocol is down

  Internet Address 172.16.10.200/24, Area 0

  Process ID 30, Router ID 172.16.11.200, Network Type BROADCAST, Cost: 1

  Topology-MTID    Cost    Disabled    Shutdown      Topology Name

        0           1         no          no            Base

  Transmit Delay is 1 sec, State DOWN, Priority 1

  No designated router on this network

  No backup designated router on this network

  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5

    oob-resync timeout 40

Vlan1 is up, line protocol is up

  Internet Address 10.200.1.1/24, Area 0

  Process ID 30, Router ID 172.16.11.200, Network Type BROADCAST, Cost: 1

  Topology-MTID    Cost    Disabled    Shutdown      Topology Name

        0           1         no          no            Base

  Transmit Delay is 1 sec, State DR, Priority 1

  Designated Router (ID) 172.16.11.200, Interface address 10.200.1.1

--More--

Vlan1 is up, line protocol is up

  Internet Address 10.200.1.1/24, Area 0

  Process ID 30, Router ID 172.16.11.200, Network Type BROADCAST, Cost: 1

  Topology-MTID    Cost    Disabled    Shutdown      Topology Name

        0           1         no          no            Base

  Transmit Delay is 1 sec, State DR, Priority 1

  Designated Router (ID) 172.16.11.200, Interface address 10.200.1.1

  No backup designated router on this network

  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5

    oob-resync timeout 40

    Hello due in 00:00:07

  Supports Link-local Signaling (LLS)

  Cisco NSF helper support enabled

  IETF NSF helper support enabled

  Index 1/1, flood queue length 0

  Next 0x0(0)/0x0(0)

  Last flood scan length is 0, maximum is 0

  Last flood scan time is 0 msec, maximum is 0 msec

  Neighbor Count is 0, Adjacent neighbor count is 0

  Suppress hello for 0 neighbor(s)

"I haven't got a full enough picture of the whole network to do so and suggest the actual config."

I can summit diagram my network configuration if you want or let me know how we can work in it.

[tony.henry_2]

I'm a bit confused why it's doing what it's doing,

Can you show me the sho ip route on the

10.12.5.209 router?

Thanks

Tony

[roberto.londono]

Sorry Tony

router 10.12.5.209 is no my is external my network.

I saw it trace router when I trace ip  10.3.1.110.

I courius how I can get it 10.12.5.209 that is reason I did trace to it.