Chapter 2 Fault Detection and Isolation

Unreachable Network Elements

Table 2-1

 

Unreachable Network Elements (continued)

 

 

 

 

 

 

VNE Type

Checks reachability using

When the NE fails to respond

When the NE is reachable

 

 

 

 

 

Generic

•

SNMP only (default).

General polling is suspended, and a VNE

• General polling is restarted.

VNE

 

During the SNMP test the

Unreachable alarm is sent to the

• The first time the VNE is

 

 

unit’s “SNMP get” the

Cisco ANA Gateway. Only the

 

 

 

started, all the commands are

 

 

sysoid of the NE and

reachability tests are executed thereafter to

 

 

 

 

submitted to the queue, and the

 

 

expects to receive a

detect when the device is reachable again.

 

 

 

 

collector initiates an

 

 

response

 

 

 

 

If more than one protocol is used, it is

 

immediate session with the

 

 

 

 

 

 

or

enough for one of them to become

 

NE. The commands are sent to

 

•

SNMP only (default),

unreachable in order to generate the alarm.

 

the NE in a serial fashion.

 

The alarm is generic to all the protocols.

 

 

 

 

and adding an ICMP test.

•

The alarm is cleared.

 

 

 

 

 

Full VNE

•

SNMP only (default).

General polling is suspended, and a VNE

• The first time the VNE is

 

 

During the SNMP

Unreachable alarm is sent to the

 

started, all the commands are

 

 

reachability test, the

Cisco ANA Gateway. Only the

 

submitted to the queue and the

 

 

VNE polls the device’s

reachability tests are executed thereafter to

 

collector initiates an

 

 

SysOID MIB using a

detect when the device is reachable again.

 

immediate session with the

 

 

standard “SNMP Get”

If more than one protocol is used, it is

 

NE. The commands are sent to

 

 

command, and expects to

 

the NE in a serial fashion.

 

 

enough for one of them to become

 

 

 

receive a response

unreachable in order to generate the alarm.

•

The alarm is cleared.

 

 

 

 

 

or

The alarm is generic to all the protocols.

 

 

 

•

SNMP only (default),

 

 

 

 

 

and adding ICMP and

 

 

 

 

 

Telnet. During the Telnet

 

 

 

 

 

test the unit sends

 

 

 

 

 

"Enter" via the open

 

 

 

 

 

session and expects to get

 

 

 

 

 

a prompt back.

 

 

 

 

 

 

 

 

 

Each of these scenarios have two possible settings in the registry, namely:

•track reachability (true/false). The default is true.

When this parameter is true reachabilty is tracked according to the specific protocol, for example, ICMP, SNMP, Telnet, and so on.

When this parameter is false then the test is not performed.

•lazy reachability (true/false). The default is false. This parameters determines whether there is a dedicated reachability command ‘in-charge’ of tracking reachability or whether reachability is determined by the regular polled commands.

When this parameter is true reachability is based on polling, and a dedicated command not activated.

When this parameter is false a dedicated SNMP command is activated, and this test verifies the response from a specific SNMP oid (sysoid is the default that can be changed).

Note Changes to the registry should only be carried out with the support of Cisco Professional Services.

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

2-2

OL-14284-01

 

 

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Cisco Systems 3.6 specifications Vne
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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.
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