Disabling IPv4 Routing

You can disable Internet Protocol version 4 (IPv4) routing for IS-IS. Disabling IPv4 routing results in the following:

Router does not advertise the NLPID for IPv4 in JUNOS software 0th link-state PDU fragment.
Router does not advertise any IPv4 prefixes in JUNOS software link-state PDUs.
Router does not advertise the NLPID for IPv4 in JUNOS software hello packets.
Router does not advertise any IPv4 addresses in JUNOS software hello packets.
Router does not calculate any IPv4 routes.

To disable IPv4 routing on the router, include the no-ipv4-routing statement:



isis {
no-ipv4-routing;
}

For a list of hierarchy levels at which you can configure this statement, see the statement summary section for this statement.

To re-enable IS-IS, remove the no-ipv4-routing statement from the configuration:



[edit protocols]
user@host# delete isis no-ipv4-routing