Enabling Forwarding of Source-Routed Packets

IP packets are normally routed according to the destination address they contain based on the routing table at each hop through a path. The originator or source of the source-routed packets specifies the path (the series of hops) that the packets must traverse; the source makes the routing decisions. The source can specify either of the following types of source routing:

• Strict-source routing specifies every hop that the packet must traverse. The specified path consists of adjacent hops. The source generates an ICMP error if the exact path cannot be followed. For example, for a path going from source router A to router B to router C to router D, router A specifies a strict-source route as B, C, D.
• Loose-source routing specifies a set of hops that the packet must traverse, but not necessarily every hop in the path. That is, the specified hops do not have to be adjacent. For example, for a path going from source router A to router B to router C to router D, router A specifies a loose-source route as B, D or C, D, or B, C, D.

ip source-route

• Use to enable forwarding of source-routed packets in a VR or VRF.
• Forwarding is disabled by default in all VRs.
• Example

  host1(config)#ip source-route

• Use the no version to disable forwarding of source-routed packets on the VR or VRF.
• See ip source-route

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