This topic explains the concept of a bridge domain (BD) as a Layer 2 forwarding construct within the fabric, its association with endpoint groups (EPGs), and its role in tenant networks and service insertion.
A bridge domain (BD) is a Layer 2 forwarding construct within the fabric that can be associated with one or more endpoint groups (EPGs) and subnets.
-
One or more EPGs can be associated with a single bridge domain or subnet.
-
A bridge domain can have one or more associated subnets.
-
Multiple bridge domains together form a tenant network.
Bridge Domain Reference Information
Bridge domains are used to group endpoint groups (EPGs) and subnets for Layer 2 forwarding within the fabric.
-
Bridge domains represent Layer 2 forwarding constructs.
-
EPGs can be associated with bridge domains or subnets.
-
Multiple bridge domains form a tenant network.
To use a service function between two EPGs, those EPGs must be isolated in separate bridge domains, following legacy service insertion based on Layer 2 and Layer 3 lookups.