Cisco Systems 3.6.6 manual LDP Neighbor Down Alarm, Example of an Mpls Black Hole Scenario

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Chapter 7 MPLS Network Faults

LDP Neighbor Down Alarm

Figure 7-1 Example of an MPLS Black Hole Scenario

VPN1

PE2

Provider network

P2

VPN3

VPN1

PE3

VPN3

 

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In this case, Cisco ANA does the following:

•Identifies untagged label switching entries on P2 and PE3.

•Issues MPLS Black Hole Found alarms on the interfaces on both sides of the link (since the LSP is unidirectional).

•Initiates a backward flow starting from the link on the specific untagged entries and identifies the two LSPs traversing the link, namely:

–LSP from PE2 to PE3

–LSP from PE3 to PE2

•Issues Broken LSP Discovered alarms on both LSPs in PE2 and PE3, which are correlated to the corresponding MPLS Black Hole Found alarm.

Note The clearing alarm does not activate flows to locate the LSPs that were passing through it in order to issue a clearing alarm for Broken LSPs, but rather uses the auto-clear functionality. The gateway periodically reviews the tickets and checks if all the alarms under each ticket are cleared or configured as auto-cleared alarms, and whether the gateway correlation timeout has passed, in which case the gateway closes the ticket.

After the MPLS Black Hole alarm clears, and the configured gateway correlation timeout period is reached, the gateway can close the ticket because all the alarms correlated to MPLS Black Hole and Broken LSP are auto-cleared.

Note If an MPLS Network Link Down event causes an IP reroute and an LDP redistribution, new LSPs might be redirected through non-MPLS segments, which will create a black hole. In this case, Broken LSP Discovered alarms are issued. However, the discovered broken LSPs are correlated to the Link Down alarm and not to the MPLS Black Hole Found alarm.

LDP Neighbor Down Alarm

LDP enables neighboring P or PE routers acting as LSRs to discover peers in an MPLS network to which they can establish LDP sessions. The sessions allow the routers to negotiate and exchange labels used for forwarding packets.

Cisco Active Network Abstraction 3.6.6 MPLS User Guide

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OL-19192-01

 

 

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Contents Cisco Active Network Abstraction 3.6.6 Mpls User Guide Americas HeadquartersPage N T E N T S Viewing Rate Limit Information IPv6 VPN over Mpls Running a VPN Leak Report A-1 Organization PrefaceSection Title Description Conventions Related DocumentationConvention Indication Obtaining Documentation and Submitting a Service Request OL-19192-01 Viewing Mpls VPNs Supported Mpls and VPN Technologies and Routing ProtocolsVPN Business Configurations Mpls VPN Maps OverviewLayer 2 VPN Business Configuration and Tunnels Layer 3 VPN Business ConfigurationVPN Topology Connections Topology Example Line Description Association Example DescriptionLayer 3 VPN Map Layer 2 VPN MapCisco ANA NetworkVision Window Tree Pane Tree Map PaneRepresents Tree Pane Map Pane DescriptionMap Pane Ticket PaneManaging Mpls VPN Maps Adding a VPN to a MapConnecting a CE Device Removing a VPN from a MapDisconnecting a CE Device Showing or Hiding a CE DeviceCreating an Aggregated Node Disaggregating an Aggregated NodeNode is separated into its parts OL-19192-01 Managing VPN Business Configurations Creating a VPNManaging VPN Business Configurations Creating a VPN Moving a Virtual Router Adding a Tunnel to a VPNRemoving a Tunnel Add Tunnels Dialog BoxMoving an LCA Creating an LCADeleting an LCA Jumping to an Adjacent LCP Moving an LCPRenaming a Business Element Deleting a Business Element RequirementsOL-19192-01 Viewing VPN Properties Viewing Mpls VPN PropertiesViewing Site Properties Viewing Virtual Router Properties VRF Properties Cisco Active Network Abstraction 3.6.6 Mpls User Guide Viewing VRF Properties in the Inventory Window Displaying VRF Egress and Ingress AdjacentsVRF Properties From a Device Inventory Window Working with the VPN Service Overlay Choosing an OverlayDisplaying or Hiding Overlays Displaying or Hiding CalloutsPage OL-19192-01 Viewing Mpls Logical Inventory Mpls VPN Logical Inventory OverviewViewing Mpls VPN Properties When finished, press Ctrl + F4 to close the inventory window Viewing Routing Entities Viewing the ARP Table Viewing a Label Switched Entity Mpls Interfaces TabTraffic Engineering LSPs Tab Viewing Mpls Logical Inventory Viewing Mpls VPN Properties Viewing MP-BGP Information Viewing VRF InformationOL-19192-01 Viewing Port Configuration Port Information in the Inventory WindowViewing Pseudowire End-to End Emulation Tunnels Viewing Cross VRF Routing EntriesViewing Mpls TE Tunnel Information Viewing Access List Information OL-19192-01 OL-19192-01 IPv6 VPN over Mpls 6VPE Overview PE1 PE2 CE2Viewing IPv4 and IPv6 Addresses Addresses Interface Table Properties WindowPort with IPv4 and IPv6 Addresses Cisco ANA 6VPE Support Limitations Device Software VersionIPv6 Addressing IPv6 Address RepresentationIPv6 Address Prefix Text Representation Address TypeCompressed IPv6 Address Non-Compressed IPv4 and IPv6 AddressAdding Route Target Using Cisco ANA NetworkVision Provisioning Route TargetsCommand Builder Route Target Commands 3 4 5 6 Add Route Target Export with Address Family Preview Enabling IPv6 VRFs Adding Route Targets with IPv4 and IPv6 Address FamiliesDeleting Route Targets with IPv4 and IPv6 Address Families Deleting Route Targets Mpls Network Faults Mpls Network Alarms OverviewAlarm BGP Neighbor Loss AlarmDescription Up Alarm BGP Process Down Alarm Broken LSP Discovered AlarmLDP Neighbor Down Alarm Example of an Mpls Black Hole ScenarioMpls Black Hole Found Alarm Mpls TE Tunnel AlarmsPseudo Wire Mpls Tunnel Down Alarm Service Impact Analysis Overview Impact Analysis in Mpls NetworksService Impact Analysis For MPLS-Based VPN Services L3 VPN ReportSupported Fault Scenarios Pseudowire L2 VPN ReportLink Down Scenario Link Overutilized/Data Loss ScenarioBGP Neighbor Loss Scenario Route Reflector Example Broken LSP Discovered Scenario Pseudowire Mpls Tunnel Down ScenarioMpls TE Tunnel Down Scenario OL-19192-01 Using Cisco ANA PathTracer in Mpls Networks Cisco ANA PathTracer Tracing CapabilityCisco ANA PathTracer Starting Points Using Cisco ANA PathTracer in Mpls NetworksElement Location Start Options Cisco ANA PathTracer Endpoints Cisco ANA PathTracer WindowsElement Location End Options Cisco ANA PathTracer Multipath Window Cisco ANA PathTracer Single-Path Window Using Cisco ANA PathTracer for Layer 3 VPN Using Cisco ANA PathTracer for Layer 2 VPNUsing Cisco ANA PathTracer for Mpls TE Tunnels Viewing Mpls TE Tunnel Information Running a VPN Leak Report OL-19192-01 Numerics IN-2 IN-3 IN-4

3.6.6 specifications

Cisco Systems has continually evolved its networking solutions to address the demands of modern enterprises, with the introduction of the Cisco Systems 3.6.6 version being no exception. This version integrates cutting-edge technologies designed to enhance network performance, security, and management efficiency, catering to the increasingly complex needs of businesses across various sectors.

One of the standout features of Cisco Systems 3.6.6 is its enhanced support for automation and orchestration. This version incorporates advanced automation tools, allowing IT teams to deploy and configure network resources more rapidly and efficiently. With features such as Cisco DNA Center’s intent-based networking, organizations can streamline operations and reduce manual intervention, leading to quicker service delivery and reduced operational costs.

Security remains a top priority, and Cisco Systems 3.6.6 includes improved security protocols that help protect sensitive data and critical infrastructure. The integration of Cisco SecureX provides a unified view of security across the network, enabling organizations to respond to threats in real-time, manage vulnerabilities proactively, and maintain compliance with regulatory standards. The incorporation of machine learning and AI-driven analytics ensures that potential threats are identified and mitigated before they can escalate.

Interoperability is another key characteristic of version 3.6.6, allowing existing Cisco hardware and software to work seamlessly together. This flexibility ensures that enterprises can leverage their current investments while adopting newer technologies without the need for a complete overhaul of their existing network architecture.

Additionally, Cisco Systems 3.6.6 has enhanced support for IoT devices, integrating robust frameworks that enable organizations to manage and secure an increasing number of connected devices. With the proliferation of IoT in various industries, this feature is vital for maintaining efficiency and security, as it allows for better monitoring and control over the connected ecosystem.

In conclusion, Cisco Systems 3.6.6 embodies a comprehensive approach to modern networking challenges. Its emphasis on automation, advanced security features, interoperability, and IoT support positions it as a pivotal solution for businesses looking to enhance their operational capabilities and embrace digital transformation. As organizations worldwide adapt to an ever-evolving technological landscape, Cisco Systems 3.6.6 stands out as a reliable partner in navigating these complexities.
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