12-07-2015 10:21 PM
Anyone can give a simple solution on how to do a dual ISP on a single HUB router, and dual ISP ng single spoke router for redundancy and failover. please help im a new on computer networking.
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12-08-2015 05:19 PM
Your asking for a huge amount of assistance here ...
There are several ways of achieve this, so I will give you only one, using vrfs.
On the hub router create two vrfs, isp1 and isp2. Please each respective outside interface into the vrf, and a static default route in each vrf pointing out to the service provider for each respective isp.
Create two tunnels on the hub. Then tell the tunnel to use the "front" vrf for its traffic. Something like:
interface tunnel 0
tunnel vrf isp1
interface tunnel 1
tunnel vrf isp2
On the spoke you can use the same approach of dual vrfs, or you can use simple permanent static
routes for the remote tunnel endpoint. For example,
ip route 10.10.10.1 255.255.255.255 <next-hop ip> permanent
ip route 10.10.11.1 255.255.255.255 <next-hop ip> permanent
This will mean each tunnel can only come up over a specific outbound path (and prevent tunnels trying to come up over other tunnels).
Make the tunnel key for Tunnel0 and Tunnel1 unique, so the router can tell them apart.
12-08-2015 05:19 PM
Your asking for a huge amount of assistance here ...
There are several ways of achieve this, so I will give you only one, using vrfs.
On the hub router create two vrfs, isp1 and isp2. Please each respective outside interface into the vrf, and a static default route in each vrf pointing out to the service provider for each respective isp.
Create two tunnels on the hub. Then tell the tunnel to use the "front" vrf for its traffic. Something like:
interface tunnel 0
tunnel vrf isp1
interface tunnel 1
tunnel vrf isp2
On the spoke you can use the same approach of dual vrfs, or you can use simple permanent static
routes for the remote tunnel endpoint. For example,
ip route 10.10.10.1 255.255.255.255 <next-hop ip> permanent
ip route 10.10.11.1 255.255.255.255 <next-hop ip> permanent
This will mean each tunnel can only come up over a specific outbound path (and prevent tunnels trying to come up over other tunnels).
Make the tunnel key for Tunnel0 and Tunnel1 unique, so the router can tell them apart.
12-09-2015 06:38 AM
Thank you for the reply sir, but i still dont have the idea about vrf, it looks like complicated to me.. i tried the above configuration the only problem i am facing is when i turned off one of the tunnel ospf will never goes up it was stack at "INIT" state..
12-09-2015 10:35 AM
Check the tunnel MTUs on both ends and make sure they are identical.
Otherwise try:
debug ip ospf hello
denbig ip ospf events
And see if anything interesting comes up.
Why not use something simpler like EIGRP?
12-17-2015 07:24 PM
hi sir, thanks for the help, my ospf issue was already fix with different tunnel key, now my dual tunnnel with different isp is now working the my problem now is i got high latency with intermittent connection on my ping test when there is a lot of traffic on my network for example from 8AM-5PM.. any idea for this?
12-08-2015 05:22 PM
Also check out the Cisco Validated Design guide for DMVPN.
http://www.cisco.com/c/dam/en/us/td/docs/solutions/CVD/Aug2014/CVD-VPNWANDesignGuide-AUG14.pdf
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