H3C S5500-HI Switch Series, Руководство по настройке Mpls

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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 19 Network diagram of 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
Figure 20 ,
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 20 Network diagram of label advertisement control
Configuration prerequisites
Before you configure LDP label filtering policies, create an IP prefix list. For information about IP prefix list
configuration, see Layer 3—IP Routing Configuration Guide .
Configuration procedure
For two neighboring LSRs, configuring a label acceptance control policy on the upstream LSR and
configuring a label advertisement control policy on the downstream LSR have the same effect. To reduce
network traffic, H3C recommends configuring only label advertisement control policies.
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