3Com 3500 manual Ip interface icmpRedirect

ip interface icmpRedirect 413

ip interface icmpRedirect

✓3500

✓9000

9400

3900

9300

For CoreBuilder 9000: Applies to Layer 3 switching modules only.

Enables or disables the transmission of an Internet Control Message Protocol (ICMP) redirect to the sender of a frame to indicate that there is a better gateway available to handle the frame than this routing interface.

Valid Minimum Abbreviation

ip i icmpre

Important Considerations

■The software determines whether there is a better path for the frame by determining whether the source interface is the same as the destination interface and whether the frame’s sender is on a directly connected network. If the software determines that a received frame has a better path available through another gateway:

■It sends an ICMP redirect message back to the originator of the frame indicating the better gateway to use in the future

■It routes the frame to the gateway

■ICMP redirect can be set on a per-interface basis.

■For better performance or if you have applications that ignore ICMP redirects, disable the ability of the interface to send ICMP redirects.

■If you have two interfaces that belong to virtual LANs (VLANs) that share a given port and you want to completely disable ICMP redirects for that port, disable the redirects for each interface that shares that port. If you disable it for only one interface and enable it for the other, you may not get the performance improvement that you want.