NAV's data model should reflect modern reality, with virtual device support

Bug #1169550 reported by Morten Brekkevold
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Network Administration Visualized
Fix Released
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Morten Brekkevold

Bug Description

Solutions for virtual stacking (either for true stacking or for redundancy solutions such as Cisco VSS) that are properly modeled in ENTITY-MIB::entPhysicalTable should be modeled by NAV as well.

NAV should have some sort of stack degradation alert - in the case of Cisco VSS, if one of the nodes in a VSS dies, there is a loss of redundancy that should be alerted as a problem.

Also, we suspect that a two-node VSS will change its sysObjectID when degraded (either by shutting down one node or by an actual fault). Such an event would cause NAV to delete much of the data it has on a box.

Revision history for this message
Morten Brekkevold (mbrekkevold) wrote :

The suggested proper way of modeling real-life devices is to completely remove the relation between netbox and device, and replace it with a separate table to represent the physical components that an IP address represents. This may in fact be just a shadow image of the ENTITY-MIB::entPhysicalTable (for devices that support this).

A simple switch will have a single chassis entity that would point to the device record (which the netbox record would previously point to). A virtual switch may have multiple chassis entities in this table.

This has **huge** implications for how NAV works in many ways, since the Netbox -> Device relation is quite ingrained in code and other data models.

Changed in nav:
status: New → In Progress
assignee: nobody → Morten Brekkevold (mbrekkevold)
milestone: none → 4.3.0
Revision history for this message
Morten Brekkevold (mbrekkevold) wrote :

Based on snmpwalk data provided by a customer, it appears that a VSS does not change its sysObjectID when degraded.

Changed in nav:
status: In Progress → Fix Committed
summary: - Model virtual stacks to enable alerts on stack degradation
+ NAV's data model should reflect modern reality, with virtual device
+ support
Changed in nav:
status: Fix Committed → Fix Released
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