MPLS LDP Configuration Guide, Cisco IOS Release 12.4 Americas Headquarters Cisco Systems, Inc. 170 West Tasman Drive San Jose, CA 95134-1706 USA http://www.cisco.
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CONTENTS MPLS Label Distribution Protocol (LDP) 1 Finding Feature Information 1 Prerequisites for MPLS LDP 1 Information About MPLS LDP 1 Introduction to MPLS LDP 2 MPLS LDP Functional Overview 2 LDP and TDP Support 2 Introduction to LDP Sessions 3 Directly Connected MPLS LDP Sessions 3 Nondirectly Connected MPLS LDP Sessions 4 Introduction to LDP Label Bindings Label Spaces and LDP Identifiers 4 How to Configure MPLS LDP 5 Enabling Directly Connected LDP Sessions 6 Establishing Nondirectly Connected MPLS L
Contents Enabling MPLS LDP Session Protection 33 Verifying MPLS LDP Session Protection 35 Troubleshooting Tips 36 Configuration Examples for MPLS LDP Session Protection 36 Additional References 39 Command Reference 40 MPLS LDP Inbound Label Binding Filtering 41 Finding Feature Information 41 Restrictions 41 Information about MPLS LDP Inbound Label Binding Filtering 41 How to Configure MPLS LDP Inbound Label Binding Filtering 42 Configuring MPLS LDP Inbound Label Binding Filtering 42 Verifying that MPLS LDP
Contents MPLS LDP Graceful Restart 65 Finding Feature Information 65 Restrictions 65 Information About MPLS LDP Graceful Restart 66 How MPLS LDP Graceful Restart Works 66 How a Route Processor Advertises That It Supports MPLS LDP Graceful Restart 67 What Happens If a Route Processor Does Not Have LDP Graceful Restart 67 How to Configure MPLS LDP Graceful Restart 67 Configuring MPLS LDP Graceful Restart 67 Verifying the Configuration 69 Configuration Example for MPLS LDP Graceful Restart 69 Additional Refer
Contents MPLS LDP Configuration Guide, Cisco IOS Release 12.
MPLS Label Distribution Protocol (LDP) Multiprotocol Label Switching (MPLS) Label Distribution Protocol (LDP) enables peer label switch routers (LSRs) in an MPLS network to exchange label binding information for supporting hop-by-hop forwarding in an MPLS network. This module explains the concepts related to MPLS LDP and describes how to configure MPLS LDP in a network.
Introduction to MPLS LDP Information About MPLS LDP Introduction to MPLS LDP MPLS LDP provides the means for LSRs to request, distribute, and release label prefix binding information to peer routers in a network. LDP enables LSRs to discover potential peers and to establish LDP sessions with those peers for the purpose of exchanging label binding information. MPLS LDP enables one LSR to inform another LSR of the label bindings it has made.
Introduction to LDP Sessions Directly Connected MPLS LDP Sessions Train and Release LDP/TDP Support 12.2S, SB, and SR Trains • • • 12.T/Mainline Trains • • • • LDP is enabled by default. Cisco IOS Release 12.2(25)S and earlier releases: TDP is supported for LDP features. Cisco IOS Releases 12.2(27)SBA, 12.2(27)SRA, 12.2(27)SRB and later releases: TDP is not supported for LDP features. Cisco IOS Release 12.3(14)T and earlier releases: TDP is enabled by default. Cisco IOS Releases 12.4 and 12.
Introduction to LDP Label Bindings Label Spaces and LDP Identifiers Nondirectly Connected MPLS LDP Sessions Nondirectly Connected MPLS LDP Sessions If the LSR is more than one hop from its neighbor, it is nondirectly connected to its neighbor. For these nondirectly connected neighbors, the LSR sends out a targeted Hello message as a UDP packet, but as a unicast message specifically addressed to that LSR.
MPLS Label Distribution Protocol (LDP) How to Configure MPLS LDP • Platform-wide--An LDP platform supports a single platform-wide label space for use by interfaces that can share the same labels. For Cisco platforms, all interface types, except LC-ATM, use the platformwide label space. LDP uses a 6-byte quantity called an LDP Identifier (or LDP ID) to name label spaces.
Enabling Directly Connected LDP Sessions How to Configure MPLS LDP • • • • • Establishing Nondirectly Connected MPLS LDP Sessions, page 8 Saving Configurations MPLS Tag Switching Commands, page 11 Specifying the LDP Router ID, page 12 Preserving QoS Settings with MPLS LDP Explicit Null, page 14 Protecting Data Between LDP Peers with MD5 Authentication, page 18 Enabling Directly Connected LDP Sessions This procedure explains how to configure MPLS LDP sessions between two directly connected routers.
MPLS Label Distribution Protocol (LDP) How to Configure MPLS LDP Command or Action Step 4 mpls label protocol {ldp | tdp | both} Purpose Configures the use of LDP on all interfaces. LDP is the default. • Example: Router(config)# If you set all interfaces globally to LDP, you can override specific interfaces with either the tdp or both keyword by specifying the command in interface configuration mode.
Establishing Nondirectly Connected MPLS LDP Sessions How to Configure MPLS LDP Command or Action Purpose Step 11 show mpls ldp neighbor [[vrf vpn-name] [address | Displays the status of LDP sessions.
MPLS Label Distribution Protocol (LDP) How to Configure MPLS LDP SUMMARY STEPS 1. enable 2. configure terminal 3. mpls ip 4. mpls label protocol {ldp | tdp | both} 5. interface tunnelnumber 6. tunnel destination ip-address 7. mpls ip 8. exit 9. exit 10. show mpls ldp discovery [all | vrf vpn-name] [detail DETAILED STEPS Command or Action Step 1 enable Purpose Enables privileged EXEC mode. • Enter your password if prompted.
MPLS Label Distribution Protocol (LDP) How to Configure MPLS LDP Command or Action Step 5 interface tunnelnumber Purpose Configures a tunnel interface and enters interface configuration mode. Example: Router(config)# interface tunnel1 Step 6 tunnel destination ip-address Assigns an IP address to the tunnel interface. Example: Router(config-if)# tunnel destination 172.16.1.1 Step 7 mpls ip Configures MPLS hop-by-hop forwarding on the interface.
Saving Configurations MPLS Tag Switching Commands How to Configure MPLS LDP Interfaces: POS2/0 (ldp): xmit/recv LDP Id: 172.31.255.255:0 Tunnel1 (ldp): Targeted -> 192.168.255.255 Targeted Hellos: 172.16.0.0 -> 192.168.255.255 (ldp): active, xmit/recv LDP Id: 192.168.255.255:0 172.16.0.0 -> 192.168.0.0 (tdp): passive, xmit/recv TDP Id: 192.168.0.0:0 This command output indicates that: • • • • • • • The local LSR (172.16.0.
Specifying the LDP Router ID How to Configure MPLS LDP ip unnumbered Loopback0 mpls ip mpls label protocol ldp Specifying the LDP Router ID The mpls ldp router-id command allows you to establish the IP address of an interface as the LDP router ID. The following steps describe the normal process for determining the LDP router ID: 1 The router considers all the IP addresses of all operational interfaces.
MPLS Label Distribution Protocol (LDP) How to Configure MPLS LDP SUMMARY STEPS 1. enable 2. configure terminal 3. mpls ip 4. mpls label protocol {ldp | tdp | both} 5. mpls ldp router-id interface [force] 6. exit 7. show mpls ldp discovery [all | detail |vrf vpn-name] DETAILED STEPS Command or Action Step 1 enable Purpose Enables privileged EXEC mode. • Enter your password if prompted. Example: Router> enable Step 2 configure terminal Enters global configuration mode.
Preserving QoS Settings with MPLS LDP Explicit Null How to Configure MPLS LDP Command or Action Step 6 exit Purpose Exits global configuration mode and enters privileged EXEC mode. Example: Router(config)# exit Step 7 show mpls ldp discovery [all | detail |vrf vpnname] Displays the LDP identifier for the local router.
MPLS Label Distribution Protocol (LDP) How to Configure MPLS LDP SUMMARY STEPS 1. enable 2. configure terminal 3. mpls ip 4. mpls label protocol {ldp | tdp | both} 5. interface type number 6. mpls ip 7. exit 8. mpls ldp explicit-null [for prefix-acl | to peer-acl | for prefix-acl to peer-acl] 9. exit 10.
MPLS Label Distribution Protocol (LDP) How to Configure MPLS LDP Command or Action Step 5 interface type number Purpose Specifies the interface to be configured and enters interface configuration mode. Example: Router(config)# interface atm2/0 Step 6 mpls ip Configures MPLS hop-by-hop forwarding on the interface. • Example: You must enable MPLS forwarding on the interfaces as well as for the router.
MPLS Label Distribution Protocol (LDP) How to Configure MPLS LDP Examples Enabling explicit-null on an egress LSR causes that LSR to advertise the explicit-null label to all adjacent MPLS routers. Router# configure terminal Router(config)# mpls ldp explicit-null If you issue the show mpls forwarding-table command on an adjacent router, the output shows that MPLS packets are forwarded with an explicit-null label (value of 0).
Protecting Data Between LDP Peers with MD5 Authentication How to Configure MPLS LDP Router# configure terminal Router(config)# mpls label protocol ldp Router(config)# access-list 15 permit host 10.15.15.15 Router(config)# mpls ldp explicit-null to 15 If you issue the show mpls forwarding-table command, the output shows that explicit null labels are going only to the router specified in the access list. Router# show mpls forwarding-table Local Outgoing Prefix label label or VC or Tunnel Id 19 Pop tag 10.
MPLS Label Distribution Protocol (LDP) How to Configure MPLS LDP If a router has a password configured for a neighbor, but the neighboring router does not have a password configured, a message such as the following appears on the console who has a password configured while the two routers attempt to establish an LDP session. The LDP session is not established.
MPLS Label Distribution Protocol (LDP) How to Configure MPLS LDP Command or Action Purpose Step 5 mpls ldp neighbor [vrf vpn-name] ipaddress[password[0-7] password-string] Specifies authentication between two LDP peers. Example: Router(config)# mpls ldp neighbor 172.27.0.15 password onethirty9 Step 6 exit Exits global configuration mode and enters privileged EXEC mode.
Configuring Directly Connected MPLS LDP Sessions Example MPLS LDP Configuration Examples Peer LDP Ident: 10.0.0.21:0; Local LDP Ident 10.0.0.22:0 TCP connection: 10.0.0.21.646 - 10.0.0.22.14709; MD5 on State: Oper; Msgs sent/rcvd: 1020/1019; Downstream; Last TIB rev sent 2034 Up time: 00:00:39; UID: 3; Peer Id 1; LDP discovery sources: FastEthernet1/1; Src IP addr: 172.16.1.1 holdtime: 15000 ms, hello interval: 5000 ms Addresses bound to peer LDP Ident: 10.0.0.21 10.0.38.28 10.88.88.2 172.16.0.1 172.16.1.
MPLS Label Distribution Protocol (LDP) MPLS LDP Configuration Examples Note The configuration examples below show only the commands related to configuring LDP for Router 1, Router 2, and Router 3 in the sample network shown in the figure above. Router 1 Configuration ip cef distributed interface Loopback0 ip address 172.16.0.11 255.255.255.255 ! interface POS3/0/0 ip address 10.0.0.44 255.0.0.0 mpls ip mpls label protocol ldp ! interface POS3/0/1 ip address 192.168.0.44 255.0.0.
Establishing Nondirectly Connected MPLS LDP Sessions Example MPLS LDP Configuration Examples !Use LDP (configured i/f default) interface POS3/0/1 ip address 192.168.0.44 255.0.0.0 mpls ip mpls label protocol tdp !Enable hop-by-hop MPLS forwarding !Use TDP for this interface The configuration of Router 2 also uses the mpls label protocol ldpcommand in interface configuration mode.
MPLS Label Distribution Protocol (LDP) MPLS LDP Configuration Examples global configuration mode makes it unnecessary to explicitly specify LDP as part of the configuration from the Tunnel14 and Tunnel16. ip cef distributed !Router1 supports distributed CEF mpls label protocol ldp !Use LDP as default for all interfaces interface Loopback0 !Loopback interface for LDP ID. ip address 10.25.0.11 255.255.255.255 interface Tunnel14 !Tunnel to Router 4 requiring label distribution tunnel destination 10.11.0.
MPLS Label Distribution Protocol (LDP) Additional References Additional References Related Documents Related Topic Document Title Configures LDP on every interface associated with a specified IGP instance. MPLS LDP Autoconfiguration Ensures that LDP is fully established before the IGP path is used for switching. MPLS LDP-IGP Synchronization Allows ACLs to control the label bindings that an LSR accepts from its peer LSRs.
MPLS Label Distribution Protocol (LDP) Feature Information for MPLS Label Distribution Protocol Technical Assistance Description Link The Cisco Technical Support website contains http://www.cisco.com/techsupport thousands of pages of searchable technical content, including links to products, technologies, solutions, technical tips, and tools. Registered Cisco.com users can log in from this page to access even more content.
MPLS Label Distribution Protocol (LDP) Feature Information for MPLS Label Distribution Protocol Table 2 Feature Information for MPLS Label Distribution Protocol Overview Feature Name Releases Feature Information MPLS Label Distribution Protocol 12.0(10)ST 12.0(14)ST 12.1(2)T 12.1(8a)E 12.2(2)T 12.2(4)T 12.2(8)T 12.0(21)ST 12.0(22)S 12.0(23)S 12.2(13)T 12.4(3) 12.4(5) This feature was introduced in Cisco IOS Release 12.
MPLS Label Distribution Protocol (LDP) Feature Information for MPLS Label Distribution Protocol Feature Name Releases Feature Information In Cisco IOS Release 12.2(4)T, support was added for Cisco MGX 8850 and MGX 8950 switches equipped with a Cisco MGX RPM-PR card, and the VPI range in the show mpls atm-ldp bindings and show mpls ip binding commands was changed to 4095. In Cisco IOS Release 12.2(8)T, the debug mpls atm-ldp failurecommand was introduced. In Cisco IOS Release 12.
MPLS Label Distribution Protocol (LDP) Feature Name Releases Feature Information rather than the tag-switching form. Previously, commands were saved by using the tagswitching form of the command, for backward compatibility. See the Saving Configurations MPLS Tag Switching Commands, page 11 for more information. In Cisco IOS Release 12.4(5), the vrf vrf-name keyword/argument pair was added for the mpls ldp router-id command to allow you to associate the LDP router ID with a nondefault VRF.
Establishing Nondirectly Connected MPLS LDP Sessions Example MPLS LDP Configuration Guide, Cisco IOS Release 12.
MPLS LDP Session Protection The MPLS LDP Session Protection feature provides faster label distribution protocol convergence when a link recovers following an outage. MPLS LDP Session Protection protects a label distribution protocol (LDP) session between directly connected neighbors or an LDP session established for a traffic engineering (TE) tunnel.
MPLS LDP Session Protection Customizations Information About MPLS LDP Session Protection • • If the LSR is one hop from its neighbor, it is directly connected to its neighbor. The LSR sends out LDP Hello messages as User Datagram Protocol (UDP) packets to all the routers on the subnet. The hello message is called an LDP Link Hello. A neighboring LSR responds to the hello message and the two routers begin to establish an LDP session.
Enabling MPLS LDP Session Protection How to Configure MPLS LDP Session Protection How to Configure MPLS LDP Session Protection • • • Enabling MPLS LDP Session Protection, page 33 Verifying MPLS LDP Session Protection, page 35 Troubleshooting Tips, page 36 Enabling MPLS LDP Session Protection You use the mpls ldp session protection command to enable MPLS LDP Session Protection. This command enables LDP sessions to be protected during a link failure. By default, the command protects all LDP sessions.
MPLS LDP Session Protection How to Configure MPLS LDP Session Protection Command or Action Purpose Step 2 configure terminal Enters global configuration mode. Example: Router# configure terminal Step 3 ip cef [distributed] Configures Cisco Express Forwarding. Example: Router(config)# ip cef Step 4 interface loopback number Configures a loopback interface and enters interface configuration mode.
Verifying MPLS LDP Session Protection How to Configure MPLS LDP Session Protection Command or Action Step 9 exit Purpose Exits from interface configuration mode. Example: Router(config-if)# exit Step 10 mpls ldp session protection [vrf vpn-name] [for acl] [duration seconds] Enables MPLS LDP Session Protection. Example: Router(config)# mpls ldp session protection Verifying MPLS LDP Session Protection SUMMARY STEPS 1. show mpls ldp discovery 2. show mpls ldp neighbor 3.
Troubleshooting Tips Configuration Examples for MPLS LDP Session Protection Up time: 21:09:56 LDP discovery sources: Targeted Hello 10.0.0.5 -> 10.0.0.3, active Addresses bound to peer LDP Ident: 10.3.104.3 10.0.0.2 10.0.0.3 Step 3 show mpls ldp neighbor detail Issue this command to check that the MPLS LDP Session Protection state is Ready or Protecting. If the second last line of the output shows Incomplete, the Targeted Hello Adjacency is not up yet.
MPLS LDP Session Protection Configuration Examples for MPLS LDP Session Protection mode hsa ! ip cef distributed no ip domain-lookup multilink bundle-name both mpls label protocol ldp mpls ldp session protection no mpls traffic-eng auto-bw timers frequency 0 tag-switching tdp router-id Loopback0 force ! interface Loopback0 ip address 10.0.0.1 255.255.255.
MPLS LDP Session Protection Configuration Examples for MPLS LDP Session Protection ! ip subnet-zero ip cef distributed mpls label protocol ldp mpls ldp session protection no mpls traffic-eng auto-bw timers frequency 0 tag-switching tdp router-id Loopback0 force ! interface Loopback0 ip address 10.0.0.3 255.255.255.255 no ip directed-broadcast ! interface Ethernet5/0/0 no ip address no ip directed-broadcast shutdown full-duplex ! interface Ethernet5/0/2 ip address 10.0.0.1 255.0.0.
MPLS LDP Session Protection Additional References interface Ethernet1/4 ip address 10.0.0.2 255.0.0.0 no ip directed-broadcast full-duplex mpls label protocol ldp tag-switching ip ! router ospf 100 log-adjacency-changes redistribute connected network 10.0.0.5 0.0.0.0 area 100 network 10.0.0.0 0.255.255.255 area 100 network 10.0.0.0 0.255.255.
MPLS LDP Session Protection Command Reference Technical Assistance Description Link The Cisco Support website provides extensive http://www.cisco.com/techsupport online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies. Access to most tools on the Cisco Support website requires a Cisco.com user ID and password. If you have a valid service contract but do not have a user ID or password, you can register on Cisco.com.
MPLS LDP Inbound Label Binding Filtering Multiprotocol Label Switching (MPLS) Label Distribution Protocol (LDP) supports inbound label binding filtering. You can use the MPLS LDP Inbound Label Binding Filtering feature to configure access control lists (ACLs) for controlling the label bindings a label switch router (LSR) accepts from its peer LSRs.
Configuring MPLS LDP Inbound Label Binding Filtering How to Configure MPLS LDP Inbound Label Binding Filtering How to Configure MPLS LDP Inbound Label Binding Filtering • • Configuring MPLS LDP Inbound Label Binding Filtering, page 42 Verifying that MPLS LDP Inbound Label Bindings are Filtered, page 44 Configuring MPLS LDP Inbound Label Binding Filtering Perform this task to configure a router for inbound label filtering.
MPLS LDP Inbound Label Binding Filtering How to Configure MPLS LDP Inbound Label Binding Filtering Command or Action Purpose Step 3 ip access-list standard access-list-number Defines a standard IP access list with a number. Example: Example: Router(config)# ip access-list standard 1 Step 4 permit {source [source-wildcard] | any} [log] Specifies one or more prefixes permitted by the access list. Example: Example: Router(config-std-nacl)# permit 10.0.0.
Verifying that MPLS LDP Inbound Label Bindings are Filtered How to Configure MPLS LDP Inbound Label Binding Filtering Verifying that MPLS LDP Inbound Label Bindings are Filtered If inbound filtering is enabled, perform the following steps to verify that inbound label bindings are filtered: SUMMARY STEPS 1. Enter the show mpls ldp neighbor command to show the status of the LDP session, including the name or number of the ACL configured for inbound filtering. 2.
MPLS LDP Inbound Label Binding Filtering Configuration Examples for MPLS LDP Inbound Label Binding Filtering access-list-number | access-list-name ] Note It is important that you enter this command to see how the access list is defined; otherwise, you cannot verify inbound label binding filtering. The following command output shows the contents of IP access list 1: Example: Router# show ip access 1 Standard IP access list 1 permit 10.0.0.0, wildcard bits 0.0.0.
MPLS LDP Inbound Label Binding Filtering Additional References In the following example, the show mpls ldp bindings neighborcommand displays label bindings that were learned from 10.110.0.10. This example verifies that the LIB does not contain label bindings for prefixes that have been excluded. Router# show mpls ldp bindings neighbor tib entry: 10.2.0.0/16, rev 4 remote binding: tsr: 10.110.0.10:0, tib entry: 10.43.0.0/16, rev 6 remote binding: tsr: 10.110.0.10:0, tib entry: 10.52.0.
MPLS LDP Inbound Label Binding Filtering Feature Information for MPLS LDP Inbound Label Binding Filtering Feature Technical Assistance Description Link The Cisco Technical Support website contains http://www.cisco.com/techsupport thousands of pages of searchable technical content, including links to products, technologies, solutions, technical tips, and tools. Registered Cisco.com users can log in from this page to access even more content.
MPLS LDP Inbound Label Binding Filtering Glossary Table 3 Feature Information for MPLS LDP Inbound Label Binding Filtering Feature Feature Name Releases Feature Information MPLS LDP Inbound Label Binding Filtering Feature 12.0(26)S You can use the MPLS LDP Inbound Label Binding Filtering feature to configure access control lists (ACLs) for controlling the label bindings a label switch router (LSR) accepts from its peer LSRs. 12.2(25)S 12.3(14)T 12.2(18)SXE In Cisco IOS Release 12.
MPLS LDP Inbound Label Binding Filtering Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and/or its affiliates in the U.S. and other countries. To view a list of Cisco trademarks, go to this URL: www.cisco.com/go/trademarks. Third-party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company.
Verifying that MPLS LDP Inbound Label Bindings are Filtered MPLS LDP Configuration Guide, Cisco IOS Release 12.
MPLS LDP Autoconfiguration The MPLS LDP Autoconfiguration feature enables you to globally configure Label Distribution Protocol (LDP) on every interface associated with a specified Interior Gateway Protocol (IGP) instance.
MPLS LDP Autoconfiguration on OSPF and IS-IS Interfaces Information About MPLS LDP Autoconfiguration Information About MPLS LDP Autoconfiguration To enable LDP, you should configure it globally and on each interface where it is needed. Configuring LDP on many interfaces can be time-consuming.
MPLS LDP Autoconfiguration How to Configure MPLS LDP Autoconfiguration DETAILED STEPS Command or Action Step 1 enable Purpose Enables privileged EXEC mode. • Enter your password if prompted. Example: Router> enable Step 2 configure terminal Enters global configuration mode. Example: Router# configure terminal Step 3 mpls ip Globally enables hop-by-hop forwarding. Example: Router(config)# mpls ip Step 4 mpls label protocol ldp Specifies LDP as the default label distribution protocol.
Disabling MPLS LDP Autoconfiguration from Selected OSPF Interfaces How to Configure MPLS LDP Autoconfiguration Command or Action Step 8 router ospf process-id Purpose Enables OSPF routing and enters router configuration mode. Example: Router(config)# router ospf 1 Step 9 network ip-address wildcard-mask area area-id Specifies the interface on which OSPF runs and defines the area ID for that interface. Example: Router(config-router)# network 10.0.0.0 0.0.255.
Verifying MPLS LDP Autoconfiguration with OSPF How to Configure MPLS LDP Autoconfiguration DETAILED STEPS Command or Action Step 1 enable Purpose Enables privileged EXEC mode. • Enter your password if prompted. Example: Router> enable Step 2 configure terminal Enters global configuration mode. Example: Router# configure terminal Step 3 interface type number Specifies the interface to configure and enters interface configuration mode.
MPLS LDP Autoconfiguration How to Configure MPLS LDP Autoconfiguration Enables privileged EXEC mode. Enter your password if prompted.
Configuring MPLS LDP Autoconfiguration with IS-IS Interfaces How to Configure MPLS LDP Autoconfiguration Serial2/0 (ldp): xmit/recv Enabled: Interface config, IGP config; Hello interval: 5000 ms; Transport IP addr: 10.11.11.11 LDP Id: 10.10.10.10:0 Src IP addr: 10.0.0.1; Transport IP addr: 10.10.10.
MPLS LDP Autoconfiguration How to Configure MPLS LDP Autoconfiguration Command or Action Step 3 interface type number Purpose Specifies the interface to configure and enters interface configuration mode. Example: Router(config)# interface POS 0/2 Step 4 ip address prefix mask Assigns an IP address to the interface. Example: Router(config-if)# ip address 10.50.72.4 255.0.0.0 Step 5 ip router isis Enables IS-IS for IP on the interface.
Disabling MPLS LDP Autoconfiguration from Selected IS-IS Interfaces How to Configure MPLS LDP Autoconfiguration Command or Action Purpose Step 10 mpls ldp autoconfig [level-1 | level-2] Enables the LDP for interfaces that belong to an IS-IS process. Example: Router(config-router)# mpls ldp autoconfig Step 11 end Exits router configuration mode and returns to privileged EXEC mode.
Verifying MPLS LDP Autoconfiguration with IS-IS How to Configure MPLS LDP Autoconfiguration Command or Action Step 3 interface type number Purpose Specifies the interface to configure and enters interface configuration mode. Example: Router(config)# interface POS 3/0 Step 4 no mpls ldp igp autoconfig Disables LDP for that interface. Example: Router(config-if)# no mpls ldp igp autoconfig Step 5 end Exits interface configuration mode and returns to privileged EXEC mode.
MPLS LDP Autoconfiguration with OSPF Example Troubleshooting Tips • • IS-IS is up. LDP is enabled.
MPLS LDP Autoconfiguration with IS-IS Examples Additional References mpls ldp autoconfig area 3 end interface POS 1/0 no mpls ldp igp autoconfig MPLS LDP Autoconfiguration with IS-IS Examples The following example shows the configuration of the MPLS LDP Autoconfiguration feature on POS0/2 and 0/3 interfaces, which are running IS-IS processes: configure terminal interface POS 0/2 ip address 10.0.0.1 255.0.0.1 ip router isis ! interface POS 0/3 ip address 10.1.1.1 255.0.1.
MPLS LDP Autoconfiguration Feature Information for MPLS LDP Autoconfiguration MIBs MIB MIBs Link MPLS LDP MIB To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL: http://www.cisco.com/go/mibs RFCs RFC Title RFC 3036 LDP Specification RFC 3037 LDP Applicability Technical Assistance Description Link The Cisco Support website provides extensive http://www.cisco.
MPLS LDP Autoconfiguration Table 4 Feature Information for MPLS LDP Autoconfiguration Feature Name Releases Feature Information MPLS LDP Autoconfiguration 12.0(30)S 12.0(32)SY 12.2(28)SB 12.2(33)SRB 12.3(14)T 15.0(1)M 12.2(33)XNE This feature enables you to globally configure LDP on every interface associated with a specified Interior Gateway Protocol (IGP) instance. In Cisco IOS Release 12.0(30)S, this feature was introduced with support for OSPF. In Cisco IOS Release 12.
MPLS LDP Graceful Restart When a router is configured with Multiprotocol Label Switching (MPLS) Label Distribution Protocol (LDP) Graceful Restart (GR), it assists a neighboring router that has MPLS LDP Stateful Switchover/ Nonstop Forwarding (SSO/NSF) Support and Graceful Restart to recover gracefully from an interruption in service. In this Cisco IOS release, MPLS LDP GR functions strictly in helper mode, which means it can only help other routers that are enabled with MPLS SSO/NSF and GR to recover.
How MPLS LDP Graceful Restart Works Information About MPLS LDP Graceful Restart • • • • MPLS LDP GR is supported in strict helper mode. Tag Distribution Protocol (TDP) sessions are not supported. Only LDP sessions are supported. MPLS LDP GR cannot be configured on label-controlled ATM (LC-ATM) interfaces. MPLS LDP SSO/NSF is supported in IOS Release 12.2(25)S. It is not supported in this release.
How a Route Processor Advertises That It Supports MPLS LDP Graceful Restart How to Configure MPLS LDP Graceful Restart • • mpls ldp graceful-restart timers neighbor-liveness mpls ldp graceful-restart timers max-recovery How a Route Processor Advertises That It Supports MPLS LDP Graceful Restart A route processor that is configured to perform MPLS LDP GR includes the Fault Tolerant (FT) Type Length Value (TLV) in the LDP initialization message.
MPLS LDP Graceful Restart How to Configure MPLS LDP Graceful Restart SUMMARY STEPS 1. enable 2. configure terminal 3. ip cef [distributed] 4. mpls ldp graceful-restart 5. interface type slot/port 6. mpls ip 7. mpls label protocol {ldp| tdp| both} DETAILED STEPS Command or Action Step 1 enable Purpose Enables privileged EXEC mode. • Enter your password if prompted. Example: Router> enable Step 2 configure terminal Enters global configuration mode.
Verifying the Configuration Configuration Example for MPLS LDP Graceful Restart Command or Action Purpose Step 6 mpls ip Configures MPLS hop-by-hop forwarding for an interface. Example: Router(config-if)# mpls ip Step 7 mpls label protocol {ldp| tdp| both} Configures the use of LDP for an interface. You must use LDP.
MPLS LDP Graceful Restart Configuration Example for MPLS LDP Graceful Restart Router 1 configured with LDP GR: boot system slot0:rsp-pv-mz hw-module slot 2 image slot0:rsp-pv-mz hw-module slot 3 image slot0:rsp-pv-mz ! ip subnet-zero ip cef mpls label range 16 10000 static 10001 1048575 mpls label protocol ldp mpls ldp logging neighbor-changes mpls ldp graceful-restart mpls traffic-eng tunnels no mpls traffic-eng auto-bw timers frequency 0 mpls ldp router-id Loopback0 force ! interface Loopback0 ip address
MPLS LDP Graceful Restart Configuration Example for MPLS LDP Graceful Restart mpls ldp logging neighbor-changes mpls ldp graceful-restart mpls traffic-eng tunnels no mpls traffic-eng auto-bw timers frequency 0 no mpls advertise-labels mpls ldp router-id Loopback0 force ! interface Loopback0 ip address 17.17.17.17 255.255.255.
MPLS LDP Graceful Restart Additional References no mpls traffic-eng auto-bw timers frequency 0 mpls ldp discovery directed-hello interval 12 mpls ldp discovery directed-hello holdtime 130 mpls ldp discovery directed-hello accept mpls ldp router-id Loopback0 force ! interface Loopback0 ip address 19.19.19.19 255.255.255.255 no ip directed-broadcast ! interface POS1/0 ip address 11.0.0.2 255.0.0.
MPLS LDP Graceful Restart Feature Information for MPLS LDP Graceful Restart RFCs RFCs2 Title RFC 3036 LDP Specification RFC 3478 Graceful Restart Mechanism for Label Distribution Technical Assistance Description Link The Cisco Technical Support & Documentation website contains thousands of pages of searchable technical content, including links to products, technologies, solutions, technical tips, and tools. Registered Cisco.com users can log in from this page to access even more content.
MPLS LDP Graceful Restart Table 5 Feature Information for MPLS LDP Graceful Restart Feature Name Releases Feature Information MPLS LDP Graceful Restart 12.0(29)S 12.3(14)T 12.2(33)SRA MPLS LDP Graceful Restart assists a neighboring router that has MPLS LDP Stateful Switchover/Nonstop Forwarding (SSO/NSF) Support and Graceful Restart to recover gracefully from an interruption in service. In Cisco IOS Release 12.0(29)S, this feature was introduced.
