Which feature is used to route traffic to a specified ISP based on the source address?

A.
filter-based forwarding

B.
BGP outbound policy

C.
local preference

D.
IP source routing

Explanation:
Filter-based forwarding enables you to configure packet filters that classify packets based on header information, such as IP source address, IP destination address, IP protocol field, and source and destination TCP/UDP port numbers. If a packet matches the conditions of the filter, then traditional destination-based forwarding occurs using the routing table that is specified in the accept action of the filter definition language. Filter-based forwarding provides a very simple yet powerful tool: a policy-based routing table selector.

Filter Actions
If a packet satisfies the conditions of the filter, you can specify the filter action known as a <routing-instance>. This filter action allows you to specify the routing table instance that is used to forward traffic that matches the filters conditions. Once the routing table is identified, traditional destination-based routing occurs. In addition to the routing-instance action, you can also specify the following action modifiers in the filter:
* Alert
* Count
* Log
* Output-queue
* PLP
* Police
* Sample