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Configure a routable discovery transport address under a VRF IPv4 address-family submode for deterministic transport endpoint and connection. When LDP CSC is configured and in use: BGP label allocation policy for VRF prefixes must be per-prefix Selective VRF Download (SVD) feature must be disabled Information About Implementing Cisco MPLS LDP To implement MPLS LDP, you should understand these concepts: IP LDP Fast Reroute Loop Free Alternate The IP Fast Reroute is a mechanism that enables a router to rapidly switch traffic, after an adjacent link failure, node failure, or both, towards a pre-programmed loop-free alternative (LFA) path. This LFA path is used to switch traffic until the router installs a new primary next hop again, as computed for the changed network topology. The goal of LFA FRR is to reduce failure reaction time to 50 milliseconds by using a pre-computed alternate next hop, in the event that the currently selected primary next hop fails, so that the alternate can be rapidly used when the failure is detected. This feature targets to address the fast convergence ability by detecting, computing, updating or enabling prefix independent pre-computed alternate loop-free paths at the time of failure. IGP pre-computes a backup path per IGP prefix. IGP selects one and only one backup path per primary path. RIB installs the best path and download path protection information to FIB by providing correct annotation for protected and protecting paths. FIB pre-installs the backup path in dataplane. Upon the link or node failure, the routing protocol detects

GigabitEthernet0/1/0/13 point-to-point address-family ipv4 unicast fast-reroute per-prefix! interface GigabitEthernet0/3/0/0.1 point-to-point address-family ipv4 unicast! interface GigabitEthernet0/3/0/0.2 point-to-point address-family ipv4 unicast Configuring Local Label Allocation Control: Example The example shows how to configure local label allocation control. mpls ldp label allocate for pfx_acl_1 ! ! Configuring LDP with Graceful Restart: Example The example shows how to enable LDP with graceful restart on the POS interface 0/2/0/0. mpls ldp graceful-restart interface pos0/2/0/0 ! Configuring LDP Forwarding: Example The example shows how to configure LDP forwarding. mpls ldp address-family ipv4 label local advertise explicit-null ! show mpls ldp forwarding show mpls forwarding Configuring LDP Nonstop Forwarding with Graceful Restart: Example The example shows how to configure LDP nonstop forwarding with graceful restart. mpls ldp log graceful-restart ! graceful-restart graceful-restart forwarding state-holdtime 180 graceful-restart reconnect-timeout 15 interface pos0/1/0/0 ! show mpls ldp graceful-restart show mpls ldp neighbor gr show mpls ldp forwarding show mpls forwarding Configuring Label Acceptance (Inbound Filtering): Example The example shows how to configure inbound label filtering. mpls ldp label accept for pfx_acl_2 from 192.168.2.2 ! ! ! mpls ldp address-family ipv4 label remote accept from 192.168.1.1:0 for pfx_acl_2 ! ! ! Configuring LDP Discovery: Example The example shows how to configure LDP discovery parameters. mpls ldp router-id 192.168.70.1 discovery hello holdtime 15 discovery hello interval 5 ! show mpls ldp parameters show mpls ldp discovery Configuring LDP Auto-Configuration: Example The example shows how to configure the IGP auto-configuration feature globally for a specific OSPF interface ID.router ospf 100 mpls ldp auto-config

Mode. Step 3 ethernet evc evc-id Example: Router(config)# ethernet evc evc10 Defines an EVC and enters EVC configuration mode. Step 4 oam protocol {cfm svlan svlan-id domain domain-name| ldp} Example: Router(config-evc)# oam protocol ldp Configures either CFM or LDP as an OAM protocol. In this example, LDP is the protocol being configured. Step 5 end Example: Router(config-evc)# end Returns the CLI to privileged EXEC mode. Configuration Examples for Remote Port ShutdownExample Specifying LDP As the OAM Protocol and Associating a Service Instance to an EVCExample Configuring Xconnect Directly on an InterfaceExample Specifying LDP As the OAM Protocol and Associating a Service Instance to an EVC In this example, the OAM protocol for EVC pw_evc is specified as LDP, and service instance 1 is associated with the EVC. Router(config)# ethernet evc pw_evcRouter(config-evc)# oam protocol ldp Router(config-evc)# uni count 2Router(config-evc)# exitRouter(config)# pseudowire-class vlan-xconnectRouter(config-pw-class)# encapsulation mplsRouter(config-pw-class)# interworkingRouter(config-pw-class)# exitRouter(config)# interface ethernet 0/0Router(config-if)# ethernet lmi interfaceRouter(config-if)# ethernet uni id ce1Router(config-if)# service instance 1 ethernet pw_evcRouter(config-if-srv)# encapsulation dot1q 2Router(config-if-srv)# xconnect10.2.2.2 123 pw-class vlan-xconnectRouter(config_if-srv)# exit Example Configuring Xconnect Directly on an Interface In this example, Xconnect is configured directly on an interface. Router(config)# interface ethernet 0/0Router(config-if)# xconnect 2.2.2.2 123 pw-class vlan-xconnectRouter(config-if)# ethernet lmi interfaceRouter(config-if)# ethernet uni id ce1Router(config-if)# service instance 1 ethernet pw_evcRouter(config-if-srv)# encapsulation dot1q 2Router(config_if-srv)# exit Additional ReferencesRelated Documents Related Topic Document Title Cisco IOS commands: master list of commands with complete command syntax, command mode, command history, defaults, usage guidelines, and examples Cisco IOS Master Commands List, All Releases Cisco IOS Carrier Ethernet commands: complete command syntax, command mode, command history, defaults, usage guidelines, and examples Cisco IOS Carrier Ethernet Command Reference Standards Standard Title No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature. -- MIBs MIB MIBs Link No new or modified MIBs are supported by this feature, and support for existing MIBs has not been modified by this feature. To locate and download MIBs for selected platforms, Cisco software releases, and feature sets, use Cisco MIB Locator found at the following URL: http:/​/​www.cisco.com/​go/​mibs RFCs RFC Title No new or modified

LDP protocol. Step 5 Use the commit or end command. commit —Saves the configuration changes and remains within the configuration session. end —Prompts user to take one of these actions: Yes — Saves configuration changes and exits the configuration session. No —Exits the configuration session without committing the configuration changes. Cancel —Remains in the configuration session, without committing the configuration changes. Step 6 (Optional) show mpls ldp discovery Example: RP/0/RP0/CPU0:router# show mpls ldp discovery (Optional) Displays the status of the LDP discovery process. This command, without an interface filter, generates a list of interfaces over which the LDP discovery process is running. The output information contains the state of the link (xmt/rcv hellos), local LDP identifier, the discovered peer’s LDP identifier, and holdtime values. Step 7 (Optional) show mpls ldp vrf vrf-name discovery Example: RP/0/RP0/CPU0:router# show mpls ldp vrf red discovery (Optional) Displays the status of the LDP discovery process for the specified VRF. Step 8 (Optional) show mpls ldp vrf all discovery summary Example: RP/0/RP0/CPU0:router# show mpls ldp vrf all discovery summary (Optional) Displays the summarized status of the LDP discovery process for all VRFs. Step 9 (Optional) show mpls ldp vrf all discovery brief Example: RP/0/RP0/CPU0:router# show mpls ldp vrf all discovery brief (Optional) Displays the brief status of the LDP discovery process for all VRFs. Step 10 (Optional) show mpls ldp vrf all ipv4 discovery summary Example: RP/0/RP0/CPU0:router# show mpls ldp vrf all ipv4 discovery summary (Optional) Displays the summarized status of the LDP discovery process for