gre (Routing Options)
Syntax gre;
next-hop-based-tunnel;
Hierarchy Level [edit logical-systems logical-system-name routing-options dynamic-tunnels tunnel-name],
[edit routing-options dynamic-tunnels tunnel-name]
Release Information Statement introduced in Junos OS Release 10.1.
next-hop-based-tunnel option introduced in Junos OS Release 16.2.
Description Enable generic routing encapsulation (GRE) type for IPv4 to automatically establish
label-switched paths (LSPs) for any new provider edge (PE) router added to a full mesh
of LSPs.
Options next-hop-based-tunnel—Create a tunnel composite next hop for every dynamic GRE
tunnel configured. The tunnel composite next hop includes the dynamic tunnel’s
encapsulation data and a VPN label (when chained composite next hop is not
enabled). When this option is not configured, the default interface-based tunnel
mode is enabled. By configuring this option, a device can scale up to 32,000 IP
tunnels, which is otherwise restricted to the system limit on the number of interfaces
supported.
At a given point in time, either the next-hop-based dynamic tunnel or the default
interface-based dynamic GRE tunnel can exist on a device. A switchover from one
tunnel mode to another deletes the existing tunnels and creates new tunnels in the
new tunnel mode. As a result, a tunnel mode switchover can impact network
performance.
Required Privilege
Level
routing—To view this statement in the configuration.
routing-control—To add this statement to the configuration.
Related
Documentation
• Configuring MPLS-Signaled LSPs to Use GRE Tunnels
1545Copyright © 2017, Juniper Networks, Inc.
Chapter 41: Configuration Statements
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