Remote router with 2 DSL connections - DMVPN and EIGRP

Unanswered Question
Feb 2nd, 2010

Hello,

I have a remote location that I am only able to get basic DSL Internet connectivity.  To try and improve performance I have installed two 1.5MB DSL connections to the same router.  I have created two seperate DMVPN tunnels back to two seperate hub routers at my main site.  When I bring up both connections the performance at the remote site actually gets worse not better,  noticably worse.  When i shut down one of the two DMVPN tunnels the performance gets better.

I have attached the relevant configs from the remote / spoke router and the two hub routers.  I would appreciate any help or guidance you can give me.

Thanks in advance.

I have this problem too.
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TheCisco8 Wed, 01/09/2013 - 08:48

Looks like you need to enable CEF load-sharing on each interface. Probably on a per-destination basis.

ip cef

!

interface FastEthernet0/1

ip load-sharing per-destination

!

interface FastEthernet0/1/1

ip load-sharing per-destination

Abzal Sembay Wed, 01/09/2013 - 09:44

Hi,

You  might have a try to disable Virtual Fragmentation reassembly feature on  both Hub's interfaces (tunnel and physical) connected to Remote router.

Hub #1/2

int tun0

no ip virtual-reassembly

int f0/1

no ip virtual-reassembly

As it may cause some issues on assymetric paths. It is useful to be applied on firewalls to prevent some fragmentation attacks.

http://www.cisco.com/en/US/docs/ios/12_3t/12_3t8/feature/guide/gt_vfrag.html

Hope it will help.

TheCisco8 Wed, 01/16/2013 - 15:37

     srroeder,

          I don't know if you're still reading this, but if you are, then I have found what may well be your solution. I have just installed a very similar setup: a Cisco 2801 with two ADSL HWICs that go to the same ISP, but with different IP addresses. I tried CEF load-sharing, as I suggested in my earlier post, and it didn't work. So I had to use route-maps with tracking. It goes something like this (I've tried to customize it to match your config):

ip sla 1 

icmp-echo 151.1.1.x source-interface FastEthernet0/1

timeout 1000

threshold 40

frequency 3

ip sla schedule 1 life forever start-time now

ip sla 2 

icmp-echo 151.2.2.x source-interface FastEthernet0/1/1

timeout 1000

threshold 40

frequency 3

ip sla schedule 2 life forever start-time now

!        

!        

!        

track timer interface 5

!        

track 100 interface FastEthernet0/1 ip routing

delay down 15 up 10

!        

track 200 interface FastEthernet0/1/1 ip routing

delay down 15 up 10

!        

!        

!        

no ip classless

ip route 0.0.0.0 0.0.0.0 FastEthernet0/1 track 100

ip route 0.0.0.0 0.0.0.0 FastEthernet0/1/1 track 200

!        

!        

!        

route-map verizon0 permit 10

match ip address 100

match interface FastEthernet0/1

!        

route-map verizon1 permit 10

match ip address 100

match interface FastEthernet0/1/1


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