Chapter 8 Impact Analysis in MPLS Networks

Supported Fault Scenarios

BGP Neighbor Loss Scenario

Table 8-3shows the impacted calculations and reported affected severities for a BGP neighbor loss fault scenario.

Table 8-3 BGP Neighbor Loss Scenario

Impact and Affected Severity

Description

 

 

Impact calculation

• Initiates a local affected flow to all VRFs that are present on the

 

issuing device. Each local VRF that has route entries with a next

 

hop IP that was learned from the BGP neighbor that was lost

 

collects VRFs from both sides and pairs them together as

 

affected.

 

• Supports a route reflector configuration, whereby during the

 

affected search, affected parties are located on all BGP neighbors

 

learned via the route reflector.

 

 

Reported affected severity

Only reports on Real Affected on the IBGP domain.

 

 

Note The BGP Neighbor Loss alarm represents a scenario where there is a BGP neighbor down.

Note The affected only relate to L3 VPN services.

BGP rules require all routers within an autonomous system be fully meshed. For large networks, this requirement represents a severe scaling problem. Route reflectors enable a BGP entity to establish a single BGP connection with a peer, where through that single peer, routing information is learned from other peers. As a result, the number of BGP sessions and connections is greatly reduced.

Decreasing the number of BGP connections and the presence of route reflectors further separates the data and control paths. For example, data packets going from A to B do not go through the route reflector while the routing updates between A and B do.

Every BGP router is uniquely identified by a router ID. A route reflector is not a configuration of a specific router. A router may act as a route reflector if it has a BGP neighbor configured as a BGP client. A router may act as both a route reflector to some of its BGP neighbors (those that are configured as BGP clients) and a non-client BGP neighbor to those BGP neighbors that are configured as non-client BGP neighbors.

A route reflector follows the following logic when distributing routes to its BGP neighbors:

•A router advertises to its client peers all routes learned from both other client and non-client peers.

•A router advertises to its non-client peers only routes received from client peers.

Router ID distribution follows the same logic described previously here.

Cisco ANA modeling provides a list of one or more router IDs for each interface. This reflects the network behavior of receiving BGP updates from a BGP router (possessing that ID) through that interface. The VNE also maintains the nature of the relationships (client and non-client) among the various VNEs representing the BGP routers. Figure 8-2shows an example.

Cisco Active Network Abstraction 3.6.6 MPLS User Guide

 

OL-19192-01

8-5

 

 

 

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Cisco Systems 3.6.6 manual BGP Neighbor Loss Scenario
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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.

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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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