EIGRP routing over new L3 connections

[jkuehl]

we have our network separated into a northend and southend.  each data center has two 4510R+E switches running VSS between them.  we have both data center's connected with a port channel that connects to a 3750E switch.  we would like to remove the port channel and connect both data center's using EIGRP.  I have setup the ports as L3 with IP addresses, i have setup the EIGRP process with the network, I can ping the interface of the switch on my side of the network.  when i try to ping the other side, the ping fails.

What I am needing to happen, is to be able to drop the port-channel and then load balance over the L3 connections.

[Reza Sharifi]

Not sure why ping fails between the 2 VSS sets.  The easier design would be to have a Layer-3 portchannel between the 2 sets with one /30 instead of 4.

HTH

[jkuehl]

we were running the 4 connections for redundancy between the switches.  We have two sets of fibers, one is buried and the other is on the pole.  we wanted to make sure if one gets cuts there will have the other side to fall back on.

I am looking at building the port channels in our lab to see if that will work as well.

[Jon Marshall]

Your EIGRP adjancencies are not working properly ie. the RTO is 5000 and your Q cnt is > 0.

Do you see any messages in your log files regarding EIGRP ?

Are you sure you have connected the links correctly ie the addresses on either of the link are correct from your diagram but have you actually connected them up that way.

Jon

[jkuehl]

I ran show cdp neighbor and verified that all the connections were going to the correct interfaces with the correct IP addresses.

[Jon Marshall]

If CDP is working then you have basic connectivity at L2 but you say you cannot ping the remote ends. This sounds more like a basic connectivity issue than an EIGRP problem.

Ping is obviously L3. Are you absolutely sure the IPs and subnet masks are correct ?

Jon

[jkuehl]

show cdp neighbor

Device ID           Local Intrfce     Holdtme     Capability    Platform    Port ID

Northend              Ten 1/1/4         133             R S I  WS-C4510R Ten 1/1/1

Northend              Ten 2/6/1         172             R S I  WS-C4510R Ten 1/5/1

Northend              Ten 2/1/4         123             R S I  WS-C4510R Ten 2/1/2

Northend Interfaces

interface TenGigabitEthernet1/5/1

no switchport

ip address 10.254.250.1 255.255.255.252

end

!

interface TenGigabitEthernet2/5/1

no switchport

ip address 10.254.250.5 255.255.255.252

shutdown

end

!

interface TenGigabitEthernet1/1/1

no switchport

ip address 10.254.250.9 255.255.255.252

end

interface TenGigabitEthernet2/1/2

no switchport

ip address 10.254.250.13 255.255.255.252

end

Southend Interfaces

interface TenGigabitEthernet2/6/1

no switchport

ip address 10.254.250.2 255.255.255.252

end

interface TenGigabitEthernet1/1/4

no switchport

ip address 10.254.250.10 255.255.255.252

end

interface TenGigabitEthernet2/1/4

no switchport

ip address 10.254.250.14 255.255.255.252

end

[Jon Marshall]

Your 4500s are running VSS. Do you have different domain IDs for each pair ?

Jon

[jkuehl]

Yes both pairs of 4500's are running VSS and each pair is running a different VTP domain

[Jon Marshall]

Not the VTP domain, the domain ID when you configure VSS.

Jon

[Jon Marshall]

To see the domain ID on your switches -

"sh switch virtual"

Jon

[jkuehl]

#sh swi vir

Executing the command on VSS member switch role = VSS Active, id = 1

Switch mode                  : Virtual Switch

Virtual switch domain number : 1

Local switch number          : 1

Local switch operational role: Virtual Switch Active

Peer switch number           : 2

Peer switch operational role : Virtual Switch Standby

Executing the command on VSS member switch role = VSS Standby, id = 2

Switch mode                  : Virtual Switch

Virtual switch domain number : 1

Local switch number          : 2

Local switch operational role: Virtual Switch Standby

Peer switch number           : 1

Peer switch operational role : Virtual Switch Active

[jkuehl]

from within the northend and southend switches i can ping the other side of the L2 interfaces.

Its when i am on another switch that is connected to either the northend or southend that i am unable to ping the other side the interface.

[Jon Marshall]

In addition to previous post, when you try to ping the remote end of the connection what does the arp table show ?

Jon

[jkuehl]

Northend#sh arp | in 10.254.250

Internet  10.254.250.1            -   0008.e3ff.fc04  ARPA   TenGigabitEthernet1/5/1

Internet  10.254.250.2            0   Incomplete      ARPA  

Internet  10.254.250.9            -   0008.e3ff.fc04  ARPA   TenGigabitEthernet1/1/1

Internet  10.254.250.10           0   Incomplete      ARPA  

Internet  10.254.250.13           -   0008.e3ff.fc04  ARPA   TenGigabitEthernet2/1/2

Internet  10.254.250.14           0   Incomplete      ARPA  

Southend#sh arp | in 10.254.250

Internet  10.254.250.1            0   Incomplete      ARPA  

Internet  10.254.250.2            -   0008.e3ff.fc04  ARPA   TenGigabitEthernet2/6/1

Internet  10.254.250.10           -   0008.e3ff.fc04  ARPA   TenGigabitEthernet1/1/4

Internet  10.254.250.13           0   Incomplete      ARPA  

Internet  10.254.250.14           -   0008.e3ff.fc04  ARPA   TenGigabitEthernet2/1/4