HP 12500 Series Configuration Manual page 26

Label acceptance control
Label acceptance control is for filtering received label bindings. An upstream LSR filters the label
bindings received from the specified downstream LSR and accepts only those permitted by the specified
prefix list. As shown in
downstream device LSR B. Only if the destination address of an FEC matches the specified prefix list,
does LSR A accept the label binding of the FEC from LSR B. LSR A does not filter label bindings received
from downstream device LSR C.
Figure 8 Network diagram for label acceptance control
Label advertisement control
Label advertisement control is for filtering label bindings to be advertised. A downstream LSR advertises
only the label bindings of the specified FECs to the specified upstream LSR. As shown in
downstream device LSR A advertises to upstream device LSR B only label bindings with FEC destinations
permitted by prefix list B, and advertises to upstream device LSR C only label bindings with FEC
destinations permitted by prefix list C.
Figure 9 Network diagram for label advertisement control
Configuration prerequisites
Before you configure LDP label filtering policies, you must create an IP prefix list. For information about
IP prefix list configuration, see Layer 3—IP Routing Configuration Guide.
Figure 8, upstream device LSR A filters the label bindings received from
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Figure 9,