VPC topology includes resource topology and route topology. It shows the relationships among resources and routing paths within a Virtual Private Cloud (VPC). It also lets you view basic information about related network instances and perform operations such as instance diagnosis and path analysis.
Resource topology
Resource topology uses a topological layout to show relationships among resource entities from the VPC perspective. VPC networking covers multiple scenarios, including internal access, public internet connectivity, inter-VPC connectivity, and user network access. VPC topology supports grouping VPC networks by scenario and visually renders the VPC network structure.
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Log on to the NIS console.
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In the navigation pane on the left, choose .
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On the VPC Topology page, select a Region and a VPC ID, then click Generate Topology to view the resource topology for that VPC.
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In the Configuration area, you can:
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Select Color Inversion to adjust the color of entity icons.
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Select Show Instance ID to display the instance ID below each entity icon.
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Select Region separator to clearly view the resource topology in each region.
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Select a zone within a region to view the resource topology for that specific zone.
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Click a resource entity to perform operations such as instance diagnosis and path analysis from the entity toolbar.
Route topology
VPC route topology shows all routing and forwarding paths in a VPC based on real-time routing configurations, including paths for public internet access and inter-VPC connectivity.
VPC route topology consists of virtual switches (vSwitches), route tables, and next hop entities. The following table lists the supported next hop entity types:
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Next hop instance type |
Entity toolbar |
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IPv4 gateway |
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NAT Gateway |
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VPC peering connection (next hop connection shows the VPC peering connection instance; next hop entity shows the peer VPC entity) |
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TransitRouter |
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VPN Gateway |
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Elastic Compute Service (ECS) |
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Elastic network interfaces (ENIs) |
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Router interface (virtual border router direction) |
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Router interface (VPC direction) |
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Log on to the NIS console.
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In the navigation pane on the left, choose .
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On the VPC Topology page, select a Region and a VPC ID, then click Generate Topology.
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Click Route Topology to view paths between nodes.
NoteRoute topology uses the following aggregation rules:
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vSwitch aggregation: vSwitches in the same zone that are attached to the same route table are aggregated by default if there is more than one.
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Next hop entity aggregation: Next hop entities of the same resource type are aggregated by default if there is more than one. You can expand the group and click an individual entity to view its routing details.
Different entities show different information:
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vSwitch: Hover over a vSwitch entity to see the attached route table and all reachable next hop paths.
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Route table: Hover over a route table entity to see all attached vSwitches and all active routing paths. In the route topology view, the route forwarding component (route table instance) connects vSwitches across zones to network components such as NAT Gateway and TransitRouter. Orange dashed lines represent routing paths.
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Next hop entity: Hover over a next hop entity to see all vSwitches that can forward traffic to it. Click the entity to see all destination CIDR blocks it can reach. If the entity is in grouped mode, click the group to see the list of individual entities. You can also use the entity toolbar to perform operations such as instance diagnosis and traffic analysis. For NAT Gateway: Click the NAT Gateway entity to open a toolbar menu with options for View basic info, Instance diagnosis, Traffic analysis, Route focus, and View associated route entries to perform corresponding actions.
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Use the entity toolbar
VPC topology lets you use the entity toolbar to view basic entity information and perform operations such as path analysis, instance diagnosis, traffic analysis, viewing vSwitch subnet topology, route focus, viewing associated route entries, and viewing CEN topology.
View basic info
On the VPC Topology page, click an entity to view its Name, ID, Region, and other details.
Route focus
Route focus helps you view all routing paths associated with a specific next hop entity.
On the VPC Topology page, go to the Route Topology tab. In the next hop entity toolbar, click Route Focus to view routing paths for that next hop entity.
To return to the global route topology view, click Return to {topoName} on the right side of the page.
View associated route entries
On the VPC Topology page, go to the Route Topology tab. In the next hop entity toolbar, click View Associated Routes to see route entry details for that next hop entity.
Path analysis
Path analysis helps you check network connectivity between a source and a destination. This example uses a vSwitch.
On the VPC Topology page, click a vSwitch entity. In the entity toolbar, click Reachability Analyzer. The topology view navigates to the Analyze page and automatically fills the source field with the selected entity. Enter the destination and other required information based on your needs, then click Analyze to begin. For more information, see Use path analysis.
The 
icon represents a vSwitch node group. Click this icon, enter an entity ID in the dialog box to search for a target entity, then click the vSwitch entity and select Reachability Analyzer in the entity toolbar.
Instance diagnosis
Instance diagnosis helps you troubleshoot instance configuration and runtime status, provides diagnostic results, and suggests fixes. This example uses an Internet NAT Gateway.
On the VPC Topology page, click an Internet NAT Gateway entity. In the entity toolbar, click Instance Diagnostics. The topology view automatically navigates to the Instance Diagnostics page and starts the diagnosis. For more information, see Use instance diagnosis.
Traffic analysis
Traffic analysis helps you monitor real-time and historical network traffic. This example uses an Elastic IP Address.
On the VPC Topology page, click an Elastic IP Address entity. In the entity toolbar, click Traffic analysis. The topology view automatically navigates to the Traffic statistics tab for that entity, where you can view traffic analysis data. For more information, see Use public network traffic analysis.
View vSwitch subnet topology
Viewing vSwitch subnet topology helps you expand the resource topology from a vSwitch.
On the VPC Topology page, click a vSwitch entity. In the entity toolbar, click View VSW subnet topology to see resources associated with that vSwitch.
To return to the global resource topology view, click Return to VPC network topology on the right side of the page.
View CEN topology
On the VPC Topology page, go to the Route Topology tab. If the next hop entity is a TransitRouter (TR), click Go to CEN Topology in the entity toolbar. The route topology view automatically navigates to the CEN Topology page and generates the topology. For more information, see Use CEN topology.