I currently have a Location that has a DS3 terminated into a 7206VXR Router. We are currently experiencing over 90% Utilization on the DS3 Interface during Peak Periods. As our Fiber buildout to the Site is over 3-6 Months away we are trying to put a Band-Aid on the Bandwidth till then. Our only Cost Effectivie Solution is to feed the Site with another 20 megs via another Ethernet drop-off to the 7206VXR.
What is the Best Case Practice or Solution to either Load Balance or Combine the Bandwidth so I don't have to break up the Network. If I did have to break up the Network I would like to have Redundency between both the Serial Interface and the Ethernet Interface in case one of them goes down. Here below is the Current Interfaces for each Bandwidth Leg. Currently we are just routing out the Serial1/0 (DS3 Interface) for all Customers.
interface Serial1/0 (Full DS3 Interface) description CO-DS3 ip address 184.108.40.206 255.255.255.252 ip nat outside dsu bandwidth 44210 framing m13 cablelength 10 serial restart-delay 0
interface GigabitEthernet0/2 (20 Meg Bandwidth via 100 meg Copper physical Link) ip address 220.127.116.11 255.255.255.252 duplex auto speed auto media-type rj45 negotiation auto
The Network consists of about 3 VLAN's (Management, Private IP Pool, Public IP Pool) that we use for our DSLAM Boxes to provide Customer Internet and Management of the DSLAM Devices.
The Solution that I have used in the past is to add (2) IP Routes as you see below:
ip route 0.0.0.0 0.0.0.0 18.104.22.168
ip route 0.0.0.0 0.0.0.0 22.214.171.124
My concern for this way is that I do have Equal Cost Paths for this Solution. Again one is a 45 meg link (126.96.36.199) and the other one is 20 meg link (188.8.131.52) ..
What is the Best way to implement my 20 Meg link into the Equation so I can utilize the Bandwidth without Overloading it before my 45 meg link.
Re: Load Balancing between a Serial & Ethernet Link
I faced a similar situation in a customer network where they had 2 outbound links of different bandwidths. The solution that we implemented was to have the default route pointed out the link with higher bandwidth and to use Policy Based Routing to select certain traffic and send it out the other link. They chose web traffic and Email to go out the smaller link, but you could experiment with selecting various types of traffic until you get a mix that provides the amount of utilization that you want.
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