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Cisco L3/L2  and Etherchannel Routing Not Working.

Posted on 2016-08-29
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Last Modified: 2016-08-31
Hello Experts,

Can someone please take a look at my configurations and let me know why I'm not able to ping 200.1.1.2 from ALSW-9 and I'm not able to ping 100.1.1.2 from ALSW-10.?

This is despite that the etherchannels are up and running,

Group  Port-channel  Protocol    Ports
------+-------------+-----------+-----------------------------------------------
1      Po1(RU)         LACP      Et0/0(P)    Et0/1(P)    

Also routing to the ip addresses is in both tables for DLSW-4 and DLSW-5

      200.1.1.0/30 is subnetted, 1 subnets
D        200.1.1.0 [90/130816] via 172.16.1.2, 01:24:55, Port-channel1
DLSW-4#

      100.0.0.0/30 is subnetted, 1 subnets
D        100.1.1.0 [90/130816] via 172.16.1.1, 01:25:49, Port-channel1
DLSW-5#

And there full eigrp neighbor relationship between DLSW-4 and DLSW-5


DLSW-4#show ip eigrp neighbors
EIGRP-IPv4 Neighbors for AS(100)
H   Address                 Interface              Hold Uptime   SRTT   RTO  Q  Seq
                                                   (sec)         (ms)       Cnt Num
0   172.16.1.2              Po1                      11 00:06:18    4   100  0  5


DLSW-5#show ip eigrp neighbors
EIGRP-IPv4 Neighbors for AS(100)
H   Address                 Interface              Hold Uptime   SRTT   RTO  Q  Seq
                                                   (sec)         (ms)       Cnt Num
0   172.16.1.1              Po1                      12 00:06:59    1   100  0  5

I have attached the configuration and topology




You're help will be much appreciated.

Regards
12-38-39--ALSW-10-64.187.124.3-.txt
12-38-50--ALSW-9-64.187.124.3-.txt
12-38-55--DLSW-4-64.187.124.3-.txt
12-39-02--DLSW-5-64.187.124.3-.txt
CCNP-Lab-004-Solution_-MLS-Image.jpg
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Question by:Member_2_7966113
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LVL 26

Expert Comment

by:Predrag Jovic
ID: 41775056
Switches ALSW-9 & ALSW-10
You are using routing, not switching on those devices.
Routing table does not have entry for destination network and packets are dropped.
Issue # show ip route routing table will show only connected networks in routing table on those devices.
You have two choices:
- create routes (static or dynamic) on those devices (default route should be enough)
- disable routing
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Author Comment

by:Member_2_7966113
ID: 41775110
Hi Predrag,

Thanks for responding.

The routing tables do have routes to the networks

 200.1.1.0/30 is subnetted, 1 subnets
D        200.1.1.0 [90/130816] via 172.16.1.2, 01:24:55, Port-channel1

DLSW-4#

      100.0.0.0/30 is subnetted, 1 subnets
D        100.1.1.0 [90/130816] via 172.16.1.1, 01:25:49, Port-channel1

I want to ping 200.1.1.2 from DLSW-4 or ALSW-9 and the route exists on DLSW-4, but I can't ping the address.

In any case, I created dynamic routes with OSPF, see below and still unable to ping.

DLSW-4#show ip route ospf
Gateway of last resort is not set

      200.1.1.0/30 is subnetted, 1 subnets
O        200.1.1.0 [110/6] via 172.16.1.2, 05:29:40, Port-channel1
DLSW-4#


DLSW-4#show ip route

Gateway of last resort is not set

      100.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        100.1.1.0/30 is directly connected, Vlan100
L        100.1.1.1/32 is directly connected, Vlan100
      172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
C        172.16.1.0/30 is directly connected, Port-channel1
L        172.16.1.1/32 is directly connected, Port-channel1
      200.1.1.0/30 is subnetted, 1 subnets
O        200.1.1.0 [110/6] via 172.16.1.2, 05:30:19, Port-channel1



Also, are you suggesting the problem maybe with the command 'ip route'?

Cheers
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LVL 26

Expert Comment

by:Predrag Jovic
ID: 41775118
Wrong switches.
You do not have routes on ALSW-9 & ALSW-10.
That is my point. Packets are dropped on source switches (they never reach ALSW-4 or ALSW-5).

My assumption is that ip routing is running on all switches.
If routing is not running you would not be able to run EIGRP on ALSW-4 & ALSW-5, but since routing is not visible in running config on -4 ad -5 I guess it is like that on every device (running but there is no ip routing in output from show command).
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LVL 26

Expert Comment

by:Predrag Jovic
ID: 41775132
If routing is used there MUST be matching route for packets, otherwise packet is dropped. That's why you need at least default route on ALSW-9 & ALSW-10 (or to issue no ip routing on those switches (default gateway will be used in that case)).
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Author Comment

by:Member_2_7966113
ID: 41775140
Thanks again Predrag,

I do have default route on ALSW-9 & ALSW-10. Did you check out the configs I uploaded?

I will see if issuing the no ip routing has an effect
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Author Comment

by:Member_2_7966113
ID: 41775145
Predrag,

Just so you I can ping 200.1.1.2 from vlan 200 on DLSW-5, but I can't ping the address from it's port-channel with address 172.16.1.2
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LVL 26

Expert Comment

by:Predrag Jovic
ID: 41775148
You do not have default route, just default gateway, and commands must be issued on both devices.
ALSW-10
ip route 0.0.0.0 0.0.0.0 200.1.1.1
ALSW-9
ip route 0.0.0.0 0.0.0.0 100.1.1.1
Or no ip routing on both devices.

Any device without route will drop packets, routing must be end to end!
0
 

Author Comment

by:Member_2_7966113
ID: 41775173
OK.

So I have removed ip routing from both ALSW-10 & ALSW-9. And when I try to ping 200.1.1.2 from ALSW-9 I now get:
ALSW-9#ping 200.1.1.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 200.1.1.2, timeout is 2 seconds:
U.U.U


Just so I'm clear.

Are you suggesting that I remove default gateway and instead put in ip route 0.0.0.0 0.0.0.0 200.1.1.1 on ALSW-10?

If yes, won't I need to put back ip routing?
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Author Comment

by:Member_2_7966113
ID: 41775176
Predrag,

Still getting the same results with default route

ALSW-9#ping
*Aug 29 12:13:20.249: %SYS-5-CONFIG_I: Configured from console by console
ALSW-9#ping 200.1.1.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 200.1.1.2, timeout is 2 seconds:
U.U.U
Success rate is 0 percent (0/5)

ALSW-9#show ip route
Gateway of last resort is 100.1.1.1 to network 0.0.0.0

S*    0.0.0.0/0 [1/0] via 100.1.1.1
      100.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        100.1.1.0/30 is directly connected, Vlan100
L        100.1.1.2/32 is directly connected, Vlan100
ALSW-9#
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LVL 26

Expert Comment

by:Predrag Jovic
ID: 41775217
U.U.U typically means - no route to destination or ICMP ping is blocked

try:
debug icmp
 on both devices it will give you the clue
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Author Comment

by:Member_2_7966113
ID: 41775342
Hi Predrag,

I will have to revisit this tomorrow - my missus is getting annoyed with me.

I hope you're around tomorrow.

Cheers
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LVL 26

Accepted Solution

by:
Predrag Jovic earned 500 total points
ID: 41775361
I created the same scenario, but without etherchannel, everything works as it should with configuration details that I suggested. Etherchannel should not make any difference.
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Author Comment

by:Member_2_7966113
ID: 41778090
I also re-created the scenario without etherchannel with your suggestions and it worked.

Thank you.
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Author Comment

by:Member_2_7966113
ID: 41778093
I accidentally assigned myself the points.
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LVL 26

Expert Comment

by:Predrag Jovic
ID: 41778129
In that case - I object, and assigning of points can be corrected.
:)
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Author Closing Comment

by:Member_2_7966113
ID: 41778202
Hi Predrag, thanks for your help. Your suggestions solved the problem. Cheers
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