Hello - I apologize for the length of this description.
Problem: When my AT&T Metro Optiman connection fails, I lose connectivity bvetween sites and also Internet.
My questions is: If my AT&T Metro Optiman goes down, how can I assure that my network
will still be able to get to Primary AT&T Internet link.
Do I simply need to to enable a secondary default with higher admin that Eigrp
and specify my secondary AT&T MARO/MPLS links at sites 1 and 2?
ip route 0.0.0.0 0.0.0.0 192.168.2.x 200
See attached diagram.
See attached configs.
I have a Corporate hub/spoke network with (3) sites in Corporate City location.
There are (9) Distribution centers (DC) across country that use AT&T managed 3800's that
come into the Data Center 3800's and then access internal serverices OR are sent out to Internet.
Each (DC) has a 3750 stack as headend that connects to the AT&T MARO/MPLS 3800's.
The 3750's use c3750-ipbasek9-mz.122-55.S
E.bin with ip routing enabled and a static default to MARO/MPLS HSRP
Site 1: Data center. EVERYTHING from the spokes comes in thru this AT&T MARO/MPLS connection. This connection has a primary that connects from the AT&T MARO/MPLS router to (2) Gig interfaces on 3750 stack. There is also a secondary connection from the AT&T MARO/MPLS router to a 2960 switch.
Site 2: Corporate Executive Office has an AT&T MARO/MPLS with the same type seconday connections, BUT, this site also has "THE" Primay AT&T link to internet @ 10 Meg
The AT&T Metro Optiman connections and the Primay AT&T link to internet both use the AT&T ME 3400 to connect to the AT&T outside fiber connections.
As we found out, there is NO backup generator at this site, so when a pwr outage occurred, we lost connectivty.
Site 3: IT and other departments that connect to Corporate and Data center across an Optiman AT&T Metro link.
The original design several years ago was a flat network and ALL servers are configured to use Data Center MARO/MPLS static as default gateway.
All data comes into Data Center.
The Data center default route is to an ASA5520 located @ the Corporate Executive building.
To reach the default route ASA5520_192.168.2.1, traffic must cross an AT&T Metro Optiman.
Traffic is routed from the ASA to either Inside, DMZ or Outside via a "2811 Corporate_Edge router".
If the traffic was destined for Outside and the Primary AT&T 10 meg link is down, then traffic is routed back to the Data center to the "2811 Data Center_Edge router".
To reach our backup Internet link the "2811 Data Center_Edge router" uses a Vlan where the default gateway for the Vlan is located back at the "2811 Corporate_Edge router". So traffic has to cross back across the Optiman, to the ASA_5520 to "2811 Corporate_Edge router" and out to the ISP who provides backup Internet link.
This has been tested and does work. Although I am somewhat perplexed by the process.
Now, IF the ISP secondary link is not available, then the "2811 Data Center_Edge router" has a dialer interface that should come up and reach the ISP who provides backup Internet link.
If the link to the Primary ASA is not available, then the secondary ASA 192.168.2.2, located @ the Data Center is supposed to take over.