Forcing An Interface To Appear Up; Specifying A Debounce Time - Juniper IGP - CONFIGURATION GUIDE V11.1.X Configuration Manual

ip source-route

Forcing an Interface to Appear Up

The router enables you to force an IP interface to appear as if it is up, regardless of
the state of the lower layers.
ip alwaysup

Specifying a Debounce Time

You can set a debounce time that requires an IP interface to be in a given state for
example, up or down for the specified time before the state is reported. This feature
prevents a link that briefly goes up or down from causing an unnecessary topology
change, for example by causing an interface down condition. However, note that
increasing the debounce time increases the latency of updating the routing table to
reflect an up or down change, and the latency of routing protocols propagating the
state change.
ip debounce-time
router A to router B to router C to router D, router A specifies a strict-source route
as B, C, D.
Loose-source routing specifies a set of hops that the packet must traverse, but
not necessarily every hop in the path. That is, the specified hops do not have to
be adjacent. For example, for a path going from source router A to router B to
router C to router D, router A specifies a loose-source route as B, D or C, D, or
B, C, D.
Use to enable forwarding of source-routed packets in a VR or VRF.
Forwarding is disabled by default in all VRs.
Example
host1(config)#ip source-route
Use the no version to disable forwarding of source-routed packets on the VR or
VRF.
See ip source-route
Use to force an IP interface to appear as up regardless of the state of lower layers.
This command reduces route topology changes when the network attached to
this link is single-homed.
Example
host1(config-if)#ip alwaysup
Use the no version to make the interface appear in the current state.
See ip alwaysup
Chapter 1: Configuring IP
47
IP Routing