Specifications

mpls ldp neighbor labels accept
MP-245
Cisco IOS Multiprotocol Label Switching Command Reference
January 2010
mpls ldp neighbor labels accept
To configure a label switching router (LSR) to filter label distribution protocol (LDP) inbound label
bindings from a particular LDP peer, use the mpls ldp neighbor labels accept command in global
configuration mode. To disable this feature, use the no form of this command.
mpls ldp neighbor [vr
f vpn-name] nbr-address labels accept acl
no mpls ldp neighbor [vr
f vpn-name] nbr-address labels accept acl
Syntax Description
Defaults If the vr
f keyword is not specified, the specified LDP neighbor is configured in the default routing
domain.
Command Modes Global configuration
Command History
Usage Guidelines The specified ACL is used to filter label bindings advertised by the specified neighbor. If the prefix part
of
the label binding is permitted by the ACL, the router will accept the binding. If the prefix is denied,
the router will not accept or store the binding.
This functionality is particularly useful when two different entities manage peer LSRs; that is, the
r
ecipient cannot perform filtering by altering the configuration of the sender. This is likely to occur in
an Multiprotocol Label Switching (MPLS) virtual private network (VPN) that is using the LDP-based
Carrier Supporting Carrier (CSC) feature. In that situation, the backbone carrier may want to restrict the
set of label bindings that its provider edge (PE) router may learn from an adjacent customer edge (CE)
router that a customer carrier operates.
When inbound label binding filtering is configured, certain configuration changes may require a router
t
o retain bindings that it previously discarded. For example:
• Inbound filtering is disabled.
• An inbound filtering ACL is redefined to be less restrictive.
vrf vp
n-name (Optional) Specifies VPN routing and forwarding instance (vpn-name) for
accepting labels.
nbr-address Specifies address of the LDP peer whose advertisements are to be filtered.
labels accept ac
l Specifies the prefixes (access control list) that are acceptable (permitted).
Release Modification
12.0(26)S This command was introduced.
12.2(25)S This command was integrated into Cisco IOS Release 12.2(25)S.
12.3(14)T This command was integrated into Cisco IOS Release 12.3(14)T.
12.2(18)SXE This command was integrated into Cisco IOS Release 12.2(18)SXE.
12.2(33)SRA This command was integrated into Cisco IOS Release 12.2(33)SRA.