Chapter 4 Advanced Correlation Scenarios

IP Interface Failure Scenarios

Interface Example 1

In this example there is multipoint connectivity between a PE and number of CEs through an unmanaged Frame Relay network. All the CEs (Router2 and Router3) have logical connectivity to the PE through a multipoint subinterface on the PE (Router10). The keep alive option is enabled for all circuits. A link is disconnected inside the unmanaged network that causes all the CEs to become unreachable.

Figure 4-3 Interface Example 1

unreachable

interface Serial0/0.100

Multipoint

 

connectivity

 

Router2

 

point-to-point

 

 

 

10.222.1.2

 

 

10.200.1.2

 

 

 

 

 

 

 

 

interface Serial0/0.55

 

 

 

multipoint

 

 

Frame-Relay

10.200.1.10

 

 

cloud

 

unreachable

 

 

multipiont

Router2

 

 

IP interface

10.222.1.3

 

 

State "down"

 

interface Serial0/0.101

 

 

 

point-to-point

 

 

 

10.200.1.3

 

 

Router10

10.222.1.10

180434

The following failures are identified in the network:

A device unreachable alarm is generated for each CE.

An ip interface status down alarm is generated for the multipoint IP interface on the PE. The following correlation information is provided:

The root cause is IP subinterface down.

All the device unreachable alarms are correlated to the ip interface status down alarm on the PE.

Interface Example 2

In this example there is point-to-point connectivity between a PE and a CE through an unmanaged Frame Relay network. CE1 became unreachable, and the status of the IP interface on the other side (on the PE1) changed state to down. The “keep alive” option is enabled. The interface is shut down between the unmanaged network and CE1.

Figure 4-4

 

Interface Example 2

 

 

unreachable

interface Serial1/0.500

Point-to-point

 

 

connectivity

 

Routing Protocol

CE1

 

 

point-to-point

 

 

 

 

neighbor down syslog

60.60.60.4

 

 

 

 

102.0.0.2

 

 

 

 

 

(BGF, OSPF)

 

 

 

 

 

 

 

 

 

 

 

 

 

interface Serial1/0.100

Point-to-point

 

 

point-to-point

 

 

Frame-Relay

102.0.0.1

PE1

IP interface

 

 

 

State unknown

cloud

Point-to-point

80.80.80.69

 

 

 

 

 

 

 

 

 

IP interface

180435

 

 

 

 

State "down"

 

 

 

 

 

The following failures are identified in the network:

A device unreachable alarm is generated on the CE.

Cisco Active Network Abstraction Fault Management User Guide, Version 3.6 Service Pack 1

4-6

OL-14284-01

 

 

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Cisco Systems 3.6 specifications Interface Example

3.6 specifications

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In conclusion, Cisco Systems 3.6 represents a comprehensive evolution in networking technology, focusing on automation, security, cloud integration, SDN, collaboration, and energy efficiency. These features position Cisco as a pivotal player in supporting organizations as they navigate the complexities of digital transformation and the future of networking.