02-02-2010 07:47 AM - edited 03-04-2019 07:23 AM
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.
01-09-2013 08:48 AM
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
01-09-2013 09:44 AM
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.
01-16-2013 03:37 PM
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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