Juniper IGP - CONFIGURATION GUIDE V11.1.X, Configuration Manual

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Use the no version to restore the default value, 1 for BGP or 4 for IS-IS, OSPF,
or RIP.
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See maximum-paths
Fast Reroute Protection
If a link goes down, ECMP uses fast reroute protection to shift packet forwarding to
use operational links, thereby decreasing packet loss. Fast reroute protection updates
ECMP sets for the interface without having to wait for the route table update process.
When the next route table update occurs, a new ECMP set can be added with fewer
links or the route might point to a single next hop.
CAUTION: To provide ECMP fast reroute functionality in the event of an interface
failure, the members of an equal cost multipath must be resolved to corresponding
interfaces. If the member is an indirect next hop, the interface is obtained by using
the forwarding equivalence class (FEC) to which the member points. This method of
resolving members occurs only if the FEC, pointed to by the indirect next hop, is
either an interface or a direct next hop.
An indirect next hop member is not resolved to an interface if it points to another
indirect next hop or to an equal cost multipath. ECMP fast reroute functionality is
not available if any interfaces that correspond to unresolved indirect next hop
members go down.
If you modify an indirect next hop member to point to a different FEC (that is, a
different interface, direct next hop, indirect next hop, or ECMP), the indirect next
hop member is not resolved for the new changes.
Removing an IPv6 Configuration
To remove an IPv6 configuration from the virtual router, issue the no ipv6 command.
no ipv6
Use to remove IPv6 configuration from the virtual router.
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Example
host1(config)# no ipv6
NOTE: The E Series router automatically starts IPv6 processing when you begin
configuring an IPv6 interface. However, by issuing the ipv6 command without using
the no option, you can create an IPv6 processing instance with no IPv6 configuration.
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See ipv6
Removing an IPv6 Configuration
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Chapter 2: Configuring IPv6