Generic Commands
Page 278 7210 SAS M, T, X, R6, Mxp MPLS Configuration
Guide
If multiple policy names are specified, the policies are evaluated in the order they are specified. The
first policy that matches is applied. If multiple import commands are issued, the last command
entered will override the previous command. A maximum of five policy names can be specified.
The no form of the command removes all policies from the configuration.
Default no import — No import route policies specified.
Parameters policy-name — The import route policy name. Allowed values are any string up to 32 characters long
composed of printable, 7-bit ASCII characters. If the string contains special characters (#, $,
spaces, etc.), the entire string must be enclosed within double quotes.
The specified name(s) must already be defined.
label-withdrawal-delay
Syntax label-withdrawal-delay seconds
Context config>router>ldp
Description This command specifies configures the time interval, in seconds, LDP will delay for the withdrawal
of FEC-label binding it distributed to its neighbors when FEC is de-activated. When the timer
expires, LDP then sends a label withdrawal for the FEC to all its neighbous. This is applicable only to
LDP transport tunnels (IPv4 prefix FECs) and is not applicable to pseudowires (service FECs).
Default no label-withdrawal-delay
Parameters seconds — Specifies the time that LDP delays the withdrawal of FEC-label binding it distributed to
its neighbors when FEC is de-activated.
Values 3 — 120
tunnel-down-damp-time
Syntax tunnel-down-damp-time seconds
no tunnel-down-damp-time
Context config>router>ldp
Description 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-damptime 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.
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