Cisco Systems 12.4 manual How to Configure Mpls LDP Graceful Restart

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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. The route processor sends the LDP initialization message to a neighbor to establish an LDP session.

The FT session TLV includes the following information:

•The Learn from Network (L) flag is set to 1, which indicates that the route processor is configured to perform MPLS LDP GR.

•The Reconnect Timeout field shows the time (in milliseconds) that the neighbor should wait for a reconnection if the LDP session is lost. In this release, the timer is set to 0, which indicates that if the local router fails, its peers should not wait for it to recover. The timer setting indicates that the local router is working in helper mode.

•The Recovery Time field shows the time (in milliseconds) that the neighbor should retain the MPLS forwarding state during a recovery. If a neighbor did not preserve the MPLS forwarding state before the restart of the control plane, the neighbor sets the recovery time to 0.

What Happens If a Route Processor Does Not Have LDP Graceful Restart

If two route processors establish an LDP session and one route processor is not configured for MPLS LDP GR, the two route processors create a normal LDP session but do not have the ability to perform MPLS LDP GR. Both route processors must be configured for MPLS LDP GR.

How to Configure MPLS LDP Graceful Restart

•Configuring MPLS LDP Graceful Restart, page 67

•Verifying the Configuration, page 69

Configuring MPLS LDP Graceful Restart

You must enable MPLS LDP GR on all route processors for an LDP session to be preserved during an interruption in service.

MPLS LDP GR is enabled globally. When you enable MPLS LDP GR, it has no effect on existing LDP sessions. New LDP sessions that are established can perform MPLS LDP GR.

MPLS LDP Configuration Guide, Cisco IOS Release 12.4

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Contents Mpls LDP Configuration Guide, Cisco IOS Release Page N T E N T S Mpls LDP Inbound Label Binding Filtering Mpls LDP Graceful Restart Contents Mpls LDP Configuration Guide, Cisco IOS Release Prerequisites for Mpls LDP Finding Feature InformationInformation About Mpls LDP Mpls LDP Functional Overview Introduction to Mpls LDPLDP and TDP Support Train and ReleaseTrain and Release LDP/TDP Support Introduction to LDP SessionsNondirectly Connected Mpls LDP Sessions Enabling Directly Connected LDP Sessions, How to Configure Mpls LDPEnabling Directly Connected LDP Sessions Step Command or Action PurposeExample Step Command or Action PurposeEstablishing Nondirectly Connected Mpls LDP Sessions Step Command or ActionExamples Mpls label protocol ldp tdp both Interface tunnelnumber Tunnel destination ip-address Saving Configurations Mpls Tag Switching Commands Specifying the LDP Router ID Routerconfig# mpls ldp Router-id pos2/0/0 Following example displays the LDP router ID Preserving QoS Settings with Mpls LDP Explicit NullInterface type number Command or Action Purpose Local Outgoing Prefix Protecting Data Between LDP Peers with MD5 Authentication Summary Steps Mpls ldp neighbor vrf vpn-nameip Configuring Directly Connected Mpls LDP Sessions Example Mpls LDP Configuration ExamplesRouter 2 Configuration Router 1 ConfigurationRouter 3 Configuration Establishing Nondirectly Connected Mpls LDP Sessions Example Router 5 Configuration Router 4 ConfigurationRouter 6 Configuration Additional References Technical Assistance Description Link Feature Information for Mpls Label Distribution ProtocolRouter-id Releases Feature InformationFeature Name Releases Feature Name Releases Feature Information Page Information About Mpls LDP Session Protection Restrictions for Mpls LDP Session ProtectionMpls LDP Session Protection Customizations Enabling Mpls LDP Session Protection How to Configure Mpls LDP Session ProtectionRouterconfig-if#mpls label protocol ldp Verifying Mpls LDP Session Protection Router# show mpls ldp neighbor detail Troubleshooting TipsIp classless Redundancy Full-duplex Interface Ethernet5/0/2 RFCs Title MIBs MIBs LinkCommand Reference Restrictions Mpls LDP Inbound Label Binding FilteringConfiguring Mpls LDP Inbound Label Binding Filtering How to Configure Mpls LDP Inbound Label Binding FilteringIp access-list standard access-list-number Router# show mpls ldp neighbor 10.12.12.12 detail Verifying that Mpls LDP Inbound Label Bindings are FilteredAccess-list-number Access-list-name LDP Specification, draft-ietf-mpls-ldp-08.txt Technical Assistance Description Link Glossary Releases Feature InformationMpls LDP Inbound Label Binding Filtering Page Restrictions for Mpls LDP Autoconfiguration Mpls LDP AutoconfigurationHow to Configure Mpls LDP Autoconfiguration Information About Mpls LDP AutoconfigurationMpls LDP Autoconfiguration on Ospf and IS-IS Interfaces Configuring Mpls LDP Autoconfiguration with Ospf InterfacesGlobally enables hop-by-hop forwarding Router ospf process-id Verifying Mpls LDP Autoconfiguration with Ospf Router# show mpls interfaces Serial 2/0 detail Command or Action Purpose Step Configuring Mpls LDP Autoconfiguration with IS-IS InterfacesEnables IS-IS for IP on the interface Enables the LDP for interfaces that belong to an IS-IS Router# show isis mpls ldp Verifying Mpls LDP Autoconfiguration with IS-ISTroubleshooting Tips Mpls LDP Autoconfiguration with Ospf ExampleCommand Reference Mpls LDP Autoconfiguration with IS-IS ExamplesFeature Information for Mpls LDP Autoconfiguration Feature Information for Mpls LDP Autoconfiguration Mpls LDP Graceful Restart How Mpls LDP Graceful Restart Works Information About Mpls LDP Graceful RestartConfiguring Mpls LDP Graceful Restart How to Configure Mpls LDP Graceful RestartMpls ip Mpls label protocol ldptdpboth Verifying the Configuration Configuration Example for Mpls LDP Graceful RestartRouter 2 configured with LDP SSO/NSF Router 1 configured with LDP GRMpls label protocol ldp mpls traffic-eng tunnels mpls ip Router 3 configured with LDP SSO/NSFMpls Label Distribution Protocol Feature Information for Mpls LDP Graceful Restart Feature Information for Mpls LDP Graceful Restart

12.4 specifications

Cisco Systems has consistently been at the forefront of networking technology, and one of its notable software releases is IOS version 12.4. This version introduced significant enhancements and features that continue to influence networking practices. IOS 12.4 was specifically designed to accommodate the growing demands of network reliability, scalability, and advanced functionalities.

One of the primary characteristics of IOS 12.4 is its enhanced security features. The version integrates advanced security protocols, including improvements in IPsec, which allows for secure communication across potentially insecure networks. Additionally, it supports firewall technologies and access control lists (ACLs), ensuring that organizations can implement stringent security measures tailored to their traffic requirements.

Another defining feature of IOS 12.4 is its support for IPv6. As the internet continued to grow, the need for expanded address space became critical. With IOS 12.4, Cisco provided robust capabilities for transitioning from IPv4 to IPv6, ensuring that network managers could adopt the newer standard without sacrificing performance or reliability. This included support for routing protocols and other networking functions that were essential in an IPv6 environment.

Performance improvements were also a key aspect of IOS 12.4. The release optimized routing protocols, including Enhanced Interior Gateway Routing Protocol (EIGRP) and Open Shortest Path First (OSPF), to enhance convergence times and reduce latency. This effectively contributed to improved network efficiency and uptime.

Cisco also included advanced Quality of Service (QoS) capabilities in IOS 12.4, allowing organizations to prioritize critical traffic. Features such as class-based weighted fair queuing and low-latency queuing became invaluable for organizations requiring seamless voice and video communications over IP networks. This focus on QoS demonstrated Cisco's understanding of the growing importance of multimedia applications in modern business environments.

With a set of stable and scalable routing features, IOS 12.4 supports a variety of platforms, enabling businesses to deploy it across different networking hardware to suit their needs. The modularity of this IOS version makes it flexible for various applications, from small business networks to large enterprise systems.

In summary, Cisco Systems' IOS 12.4 brought forth a wealth of features aimed at enhancing security, performance, and flexibility. Through improved routing capabilities, strong IPv6 support, and advanced QoS features, this version laid the foundation for many of the networking principles that organizations still utilize today.
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