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Hierarchy Level


Allow IPv4-mapped IPv6 source addresses in an ICMPv6 echo request TTL expired packets.

In a dual-stack IPv6 network connected over an IPv4 MPLS network, the P routers in the IPv4 MPLS backbone do not have an IPv6 family. Consequently, the transit P routers are not shown in the output when you do an IPv6 traceroute. To generate an ICMPv6 echo request and a TTL expired response packet to and from the intermediate transit routers in the 6PE network, you must configure this statement along with the allow-v4-mapped statement.

Required Privilege Level

admin—To view this statement in the configuration.

admin-control—To add this statement to the configuration.