H3C Technologies H3C S10500 Series Switches - Manual (Page 75)

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Figure 19 Network diagram of label acceptance control
Label bindings
permitted by the label
filtering configuration
Upstream
LSR A
Downstream
LSR B
Accept label bindings
Drop label bindings
Label bindings not permitted
Downstream
LSR C
Do
n
ot
filte
r la
be
l
bin
din
gs
2. 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, you must create an IP prefix list. For information about IP
prefix list configuration, see Layer 3—IP Routing Configuration Guide.
Configuring LDP lable filtering
Follow these steps to configure LDP label filtering policies:
To do… Use the command… Remarks
Enter system view system-view —
Enter MPLS LDP view mpls ldp —