Disabling forwarding of IP source-routed packets
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 both 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.
NOTE
The Layer 3 switch allows you to disable sending of the Source-Route-Failure messages.
- 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 Layer 3 switch forwards both types of source-routed packets by default. To disable the feature, use either of the following methods. You cannot enable or disable strict or loose source routing separately.
To disable forwarding of IP source-routed packets, enter the no ip source-route command.
device # configure terminal device(config)# no ip source-route
Syntax: [no] ip source-route
To re-enable forwarding of source-routed packets, enter the ip source-route command.
device # configure terminal device(config)# ip source-route