Associating Track with EVI IS-IS

EVI is a MAC-in-IP technology that provides Layer 2 connectivity between distant Layer 2 network sites across an IP routed network. It is used for connecting geographically dispersed sites of a virtualized large-scale data center that requires Layer 2 adjacency. EVI IS-IS establishes adjacencies and advertises MAC reachability information among edge devices at different sites in an EVI network.

EVI IS-IS uses a hello mechanism to monitor the connectivity of each EVI link on an EVI tunnel. To detect the connectivity of a particular EVI link more quickly, you can associate its tunnel interface with a track entry. The monitoring protocol used in this entry can only be BFD.

EVI IS-IS changes the state of an EVI-Link interface in response to the track entry state, as shown in Table 9.

Table 9: EVI IS-IS action on the monitored EVI-Link in response to the track entry state change

Track entry state	State of the monitored EVI link	EVI IS-IS action on the EVI-Link interface
Positive	The EVI link is operating correctly.	Places the EVI-Link interface in up state.
Negative	The EVI link has failed.	Places the EVI-Link interface in down state.
NotReady	The EVI link is not monitored. This situation occurs when the Track module or the detection module is not ready (for example, the Track module is restarting or the monitoring settings are incomplete). In this situation, EVI cannot obtain information about the EVI link from the Track module.	N/A

Track entry state

State of the monitored EVI link

EVI IS-IS action on the EVI-Link interface

Positive

The EVI link is operating correctly.

Places the EVI-Link interface in up state.

Negative

The EVI link has failed.

Places the EVI-Link interface in down state.

NotReady

The EVI link is not monitored.

This situation occurs when the Track module or the detection module is not ready (for example, the Track module is restarting or the monitoring settings are incomplete). In this situation, EVI cannot obtain information about the EVI link from the Track module.

N/A

For more information about EVI IS-IS, see EVI Configuration Guide.

To associate an EVI tunnel interface with a track entry:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enter EVI tunnel interface view.	interface tunnel number [ mode evi [ ipv6 ] ]	N/A
3. Associate a track entry with the tunnel interface.	evi isis track track-entry-number	By default, an EVI tunnel interface is not associated with any track entry. You can associate an EVI tunnel interface with only one track entry.

Step

Command

Remarks

1. Enter system view.

system-view

N/A

2. Enter EVI tunnel interface view.

interface tunnel number [ mode evi [ ipv6 ] ]

N/A

3. Associate a track entry with the tunnel interface.

evi isis track track-entry-number

By default, an EVI tunnel interface is not associated with any track entry.

You can associate an EVI tunnel interface with only one track entry.

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