Alcatel-Lucent 7450 Manual page 658

tunnel-down-damp-time
Syntax
Context
Description
Parameters
keepalive
Syntax
Context
Description
Page 658
tunnel-down-damp-time seconds
no tunnel-down-damp-time
config>router>ldp
This command specifies the time interval, in seconds, that LDP waits before posting a tunnel down
event to the Tunnel Table Manager (TTM).
When LDP can no longer resolve a FEC and de-activates it, it de-programs the NHLFE in the data
path. It will however delay deleting the LDP tunnel entry in the TTM until the tunnel-down-damp-
time timer expires. This means users of the LDP tunnel, such as SDPs (all services) and BGP (L3
VPN), will not be notified immediately. Traffic is still blackholed because the forwarding engine
NHLFE has been de-programmed.
If the FEC gets resolved before the tunnel-down-damp-time timer expires, then LDP programs the
forwarding engine with the new NHLFE and performs a tunnel modify event in TTM updating the
dampened entry in TTM with the new NHLFE information. If the FEC does not get resolved and the
tunnel-down-damp-time timer expires, LDP posts a tunnel down event to TTM which deletes the
LDP tunnel.
When there is an upper layer (user of LDP) which depends of LDP control plane for failover
detection then label withdrawal delay and tunnel-down-damp-time options must be set to 0.
An example is pseudowire redundancy where the primary PW doesn't have its own fast failover
detection mechanism and the node depends on LDP tunnel down event to activate the standby PW.
The no form of this command then tunnel down events are not damped.
seconds — Specifies the time interval, in seconds, that LDP waits before posting a tunnel down event
to the Tunnel Table Manager.
keepalive timeout factor
no keepalive
config>router>ldp>if-params>interface>ipv4
config>router>ldp>if-params>interface>ipv6
config>router>ldp>if-params>ipv4
config>router>ldp>if-params>ipv6
config>router>ldp>targeted-session>ipv4
config>router>ldp>targeted-session>ipv6
config>router>ldp>targ-session>peer
config>router>ldp>targ-session>peer-template
This command configures the time interval, in seconds, that LDP waits before tearing down the
session. The factor parameter derives the keepalive interval.
7450 ESS MPLS Guide