Load Sharing with Static Routes Outgoing Traffic

Outgoing traffic load sharing is easy to achieve.

Each customer router uses the closest customer edge router as the exit point.

Outgoing traffic load sharing is easy to achieve.

Each customer router uses the closest customer edge router as the exit point.

Balanced load sharing is achieved if the customer edge routers are collocated.

Load sharing of outgoing customer traffic is accomplished by configuring a standard default static route in both customer edge routers. Each static route is valid as long as the serial link in each router is up. When both static routes are valid, both customer edge routers announce the default route into the customer network.

The remaining routers in the customer network see two candidate gateways of last resort. These remaining routers choose the closest one, with respect to the IGP metric. The part of the network that is closer to the uppermost exit point uses that exit point for all outgoing traffic. The other part of the network uses the other (lower) exit point.

If both exit points are collocated, they are equally distant from each of the other routers in the customer network. Each router within the customer network therefore uses load sharing of traffic sent out both exit points.

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