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

 

OL-19192-01

7-5

 

 

 

Page 76 Page 78
Page 77
Image 77
Cisco Systems 3.6.6 manual Mpls Black Hole Found Alarm, Mpls TE Tunnel Alarms
Page 76 Page 78

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.
Top Page Image Contents