Enable PMTU Discovery

1. Enter Global Configuration mode.

   SEFOS# configure terminal
   

2. Enable PMTU discovery.

   Type one of these commands.

   SEFOS(config)# ipv6 path mtu discover
   

   SEFOS(config)# ipv6 path mtu 2004::0 1500
   

   where:

   • 2400::0 is the prefix address.

   • 1500 is the MTU value.

3. Review the IPv6 PMTU status.

   SEFOS# show ipv6 pmtu