03-11-2015 12:36 AM - edited 03-05-2019 12:59 AM
Hi fellow experts,
I have been told by the customer that, they have a DTS fiber optic to connect between HQ and branch, Cisco 2911 on both side. They also have a WAN link which connect to a ISP as a backup link. When the DTS fiber link fails, they manually unplug and plug in the cable from the Cisco 2911 router to the ISP router.
Now, the customer wish to make this process automatically, where the DTS fiber optic remain, and also have the connection to the WAN via VPN. Can it be done? What is the solution?
Please find the attachment for reference.
03-11-2015 12:52 AM
Hello!
If You use L3, You can use tunnel via WAN and EIGRP.
03-11-2015 01:02 AM
Hi Oleg,
Thanks for your comment.
Cisco 2911 is a L3 router isn't? Tunnel? VPN tunnel?
Can be done by uing routing protocol such as EIGRP?
03-11-2015 01:04 AM
Yes.
You can configure VPN tunnel, and EIGRP routing.
EIGRP automatic change route, if primary link go to down
03-11-2015 01:09 AM
Thanks Oleg,
Do we need fix IP on both side to build VPN tunnel on top of ISP WAN link?
03-11-2015 01:14 AM
Yes.
03-11-2015 02:15 AM
Thanks Oleg,
Do you have a sample configuration to do EIGRP active/standby link failover?
03-11-2015 02:17 AM
I can write sample slightly later but today!
03-11-2015 02:53 AM
Thank you in advance!
03-11-2015 07:06 AM
You can do next:
For example Your interfaces on first router:
Gig0/0.1 ip address 10.0.0.1/24 link to second router
Gig0/0.2 ip address 10.10.0.1/24 Inside network
Gig0/0.3 ip address 81.23.123.77/30 WAN
router eigrp 10
network 10.0.0.0 0.0.0.255
network 10.10.0.0 0.0.0.255
network 10.20.0.0 0.0.0.3
Int Tunnel1
ip address 10.20.0.1 255.255.255.252
ip mtu 1400
ip tcp adjust-mss 1360
tunnel source 81.23.123.77
tunnel destination 81.23.10.2
tunnel mode gre ip
For example Your interfaces on second router:
Gig0/0.1 ip address 10.0.2.1/24 link to second router
Gig0/0.2 ip address 10.10.2.1/24 Inside network
Gig0/0.3 ip address 81.23.10.2/30 WAN
router eigrp 10
network 10.0.2.0 0.0.0.255
network 10.10.2.0 0.0.0.255
network 10.20.0.0 0.0.0.3
Int Tunnel1
ip address 10.20.0.2 255.255.255.252
ip mtu 1400
ip tcp adjust-mss 1360
tunnel source 81.23.10.2
tunnel destination 81.23.123.77
tunnel mode gre ip
Also, You can use bandwidth on Tunnel interface like:
bandwidth 10000
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