Cisco Systems 3.6.6 manual Mpls Black Hole Found Alarm, Mpls TE Tunnel Alarms

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Chapter 7 MPLS Network Faults

MPLS Black Hole Found Alarm

If a session to an LDP neighbor goes down, an LDP Neighbor Down alarm is issued. This can happen as the result of a failure in the TCP connection used by the LDP session, or if the interface is no longer running MPLS. The LDP neighbor down alarm is cleared by a corresponding LDP Neighbor Up alarm.

The alarm is issued when a peer is removed from the table in the LDP Neighbors tab. The alarm runs a correlation flow to detect the network core triggering event A root cause analysis is performed to find the root cause. The alarm initiates an IP-based flow toward the peer transport address destination. If an alarm is found during the flow, that alarm is correlate to to the LDP Neighbor Down alarm.

Note The LDP Neighbor Down alarm can correlate to the MPLS Interface Removed alarm.

MPLS Black Hole Found Alarm

an MPLS black hole is defined as an abnormal termination of an MPLS path (LSP) inside an MPLS network. An MPLS black hole exists when on a specific interface there are untagged entries destined for a known PE router. It is assumed that a router functions as a PE router if there are services using the MPLS network, such as L3 VPNs or pseudowire (L2 VPN) MPLS tunnels. Note that the untagged interfaces may exist in the network in normal situations. For example, where the boundary of the MPLS cloud has untagged interfaces this is still considered normal.

An MPLS black hole cause the loss of all the MPLS labels on a packet including the VPN information that lies in the inner MPLS label. If a packet goes through an untagged interface, the VPN information is lost. The VPN information loss causes VPN sites to lose connectivity.

MPLS Black Hole Found alarms are actively detected. Service alarms are generated whenever

Cisco ANA discovers an MPLS interface with at least one untagged LSP leading to a known PE router.

Black hole alarms are detected either:

•When the system is loaded for the first time and performs the initial discovery of the network.

•Through the ongoing discovery process, which identifies changes in the network.

Note The MPLS black hole discovery is supported only when the PEs are managed by Cisco ANA.

MPLS TE Tunnel Alarms

MPLS TE tunnel alarms include:

•MPLS TE Tunnel Down

•MPLS TE Tunnel Flapping

•Tunnel Reoptimized

If a TE tunnel operational status changes to down, an MPLS TE Tunnel Down alarm is generated. The Cisco ANA correlation engine identifies the faults that affect the TE tunnel status and identifies the root cause for the MPLS TE Tunnel Down alarm. For example, a Link Down will cause a TE tunnel to go down. Multiple up and down alarms that are generated during a short time interval are suppressed and displayed as an MPLS TE Tunnel Flapping alarm (according to the specific flapping configuration).

MPLS TE Tunnel Down and MPLS TE Tunnel Flapping alarms are actively detected and service alarms are generated. The system also supports MPLS TE Tunnel Down syslogs, which are correlated to the service alarm.

Cisco Active Network Abstraction 3.6.6 MPLS User Guide

 

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Contents Americas Headquarters Cisco Active Network Abstraction 3.6.6 Mpls User GuidePage N T E N T S Viewing Rate Limit Information IPv6 VPN over Mpls Running a VPN Leak Report A-1 Section Title Description PrefaceOrganization Convention Indication Related DocumentationConventions Obtaining Documentation and Submitting a Service Request OL-19192-01 Supported Mpls and VPN Technologies and Routing Protocols Viewing Mpls VPNsMpls VPN Maps Overview VPN Business ConfigurationsVPN Topology Connections Layer 3 VPN Business ConfigurationLayer 2 VPN Business Configuration and Tunnels Association Example Description Topology Example Line DescriptionLayer 2 VPN Map Layer 3 VPN MapCisco ANA NetworkVision Window Tree Map Pane Tree PaneRepresents Tree Pane Map Pane DescriptionTicket Pane Map PaneAdding a VPN to a Map Managing Mpls VPN MapsRemoving a VPN from a Map Connecting a CE DeviceShowing or Hiding a CE Device Disconnecting a CE DeviceDisaggregating an Aggregated Node Creating an Aggregated NodeNode is separated into its parts OL-19192-01 Creating a VPN Managing VPN Business ConfigurationsManaging VPN Business Configurations Creating a VPN Adding a Tunnel to a VPN Moving a Virtual RouterAdd Tunnels Dialog Box Removing a TunnelDeleting an LCA Creating an LCAMoving an LCA Renaming a Business Element Moving an LCPJumping to an Adjacent LCP Requirements Deleting a Business ElementOL-19192-01 Viewing Site Properties Viewing Mpls VPN PropertiesViewing VPN Properties Viewing Virtual Router Properties VRF Properties Cisco Active Network Abstraction 3.6.6 Mpls User Guide Displaying VRF Egress and Ingress Adjacents Viewing VRF Properties in the Inventory WindowVRF Properties From a Device Inventory Window Choosing an Overlay Working with the VPN Service OverlayDisplaying or Hiding Callouts Displaying or Hiding OverlaysPage OL-19192-01 Mpls VPN Logical Inventory Overview Viewing Mpls Logical InventoryViewing Mpls VPN Properties When finished, press Ctrl + F4 to close the inventory window Viewing Routing Entities Viewing the ARP Table Mpls Interfaces Tab Viewing a Label Switched EntityTraffic Engineering LSPs Tab Viewing Mpls Logical Inventory Viewing Mpls VPN Properties Viewing VRF Information Viewing MP-BGP InformationOL-19192-01 Port Information in the Inventory Window Viewing Port ConfigurationViewing Cross VRF Routing Entries Viewing Pseudowire End-to End Emulation TunnelsViewing Mpls TE Tunnel Information Viewing Access List Information OL-19192-01 OL-19192-01 IPv6 VPN over Mpls PE1 PE2 CE2 6VPE OverviewAddresses Interface Table Properties Window Viewing IPv4 and IPv6 AddressesPort with IPv4 and IPv6 Addresses Device Software Version Cisco ANA 6VPE Support LimitationsIPv6 Address Representation IPv6 AddressingAddress Type IPv6 Address Prefix Text RepresentationCompressed IPv6 Address Non-Compressed IPv4 and IPv6 AddressProvisioning Route Targets Adding Route Target Using Cisco ANA NetworkVisionCommand Builder Route Target Commands 3 4 5 6 Add Route Target Export with Address Family Preview Adding Route Targets with IPv4 and IPv6 Address Families Enabling IPv6 VRFsDeleting Route Targets with IPv4 and IPv6 Address Families Deleting Route Targets Mpls Network Alarms Overview Mpls Network FaultsDescription Up Alarm BGP Neighbor Loss AlarmAlarm Broken LSP Discovered Alarm BGP Process Down AlarmExample of an Mpls Black Hole Scenario LDP Neighbor Down AlarmMpls TE Tunnel Alarms Mpls Black Hole Found AlarmPseudo Wire Mpls Tunnel Down Alarm Impact Analysis in Mpls Networks Service Impact Analysis OverviewL3 VPN Report Service Impact Analysis For MPLS-Based VPN ServicesPseudowire L2 VPN Report Supported Fault ScenariosLink Overutilized/Data Loss Scenario Link Down ScenarioBGP Neighbor Loss Scenario Route Reflector Example Mpls TE Tunnel Down Scenario Pseudowire Mpls Tunnel Down ScenarioBroken LSP Discovered Scenario OL-19192-01 Cisco ANA PathTracer Tracing Capability Using Cisco ANA PathTracer in Mpls NetworksElement Location Start Options Using Cisco ANA PathTracer in Mpls NetworksCisco ANA PathTracer Starting Points Element Location End Options Cisco ANA PathTracer WindowsCisco ANA PathTracer Endpoints Cisco ANA PathTracer Multipath Window Cisco ANA PathTracer Single-Path Window Using Cisco ANA PathTracer for Layer 2 VPN Using Cisco ANA PathTracer for Layer 3 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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