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Page 760 7450 ESS MPLS Guide
Label-Retention
liberal — All advertised label mappings are retained whether they
are from a valid next hop or not. When the label distribution value is
downstream unsolicited, a router may receive label bindings for the
same destination for all its neighbors. Labels for the non-next hops for
the FECs are retained in the software but not used. When a network
topology change occurs where a non-nexthop becomes a true next hop,
the label received earlier is then used.
conservative — Advertised label mappings are retained only if
they will be used to forward packets; for example if the label came
from a valid next hop. Label bindings received from non-next hops for
each FEC are discarded.
Control Mode
ordered — Label bindings are not distributed in response to a label
request until a label binding has been received from the next hop for
the destination.
independent — Label bindings are distributed immediately in
response to a label request even if a label binding has not yet been
received from the next hop for the destination.
Route Preference
The route preference assigned to LDP routes. When multiple routes are
available to a destination, the route with the lowest preference will be
used. This value is only applicable to LDP interfaces and not for tar-
geted sessions.
Loop Detection
none — Loop detection is not supported on this router. This is the
only valid value since Path Vector based loop detection is not sup-
ported.
other — Loop detection is supported but by a method other than
hopCount, pathVector, or hopCountAndPathVector.
hopCount — Loop detection is supported by hop count only.
pathVector — Loop detection is supported by path vector only.
hopCountAndPathVector — Loop detection is supported by
both path vector and hop count.
Keepalive Timeout
The factor used to derive the Keepalive interval.
Keepalive Factor
The time interval, in seconds, that LDP waits before tearing down the
session.
Hold-Time
The time left before a neighbor is declared to be down.
Hello Factor
The value by which the hello timeout should be divided to give the
hello time, for example, the time interval, in seconds, between LDP
hello messages. LDP uses hello messages to discover neighbors and to
detect loss of connectivity with its neighbors.
Label Description (Continued)
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