ip source-route

A source-routed packet specifies the exact router path for the packet. The packet specifies the path by listing the IP addresses of the router interfaces through which the packet must pass on its way to the destination. The Layer 3 switch supports strict and loose types of IP source routing.

Strict source routing requires the packet to pass through only the listed routers. If the Layer 3 switch receives a strict source-routed packet but cannot reach the next hop interface specified by the packet, the Layer 3 switch discards the packet and sends an ICMP Source-Route-Failure message to the sender.

Loose source routing requires that the packet pass through all of the listed routers but also allows the packet to travel through other routers, which are not listed in the packet.

The no form of the command disables forwarding of IP source-routed packets.