Understanding PVLAN Traffic Flows Across Multiple Switches

Community VLAN Sending Untagged Traffic

In this scenario, a VLAN in Community-1 of Switch 1 at interface ge-0/0/0 sends untagged traffic. The arrows in Figure 1 represent this traffic flow.

Figure 1: Community VLAN Sends Untagged Traffic

In this scenario, the following activity takes place on Switch 1:

• Community-1 VLAN on interface ge-0/0/0: Learning
• pvlan100 on interface ge-0/0/0: Replication
• Community-1 VLAN on interface ge-0/0/12: Receives traffic
• PVLAN trunk port: Traffic exits from ge-1/0/2 and from ae0 with tag 10
• Community-2: Interface receives no traffic
• Isolated VLANs: Interfaces receive no traffic

In this scenario, this activity takes place on Switch 3:

• Community-1 VLAN on interface ge-0/0/23 (PVLAN trunk): Learning
• pvlan100 on interface ge-0/0/23: Replication
• Community-1 VLAN on interface ge-0/0/9 and ge-0/0/16: Receives traffic
• Promiscuous trunk port: Traffic exits from ge-0/0/0 with tag 100
• Community-2: Interface receives no traffic
• Isolated VLANs: Interfaces receive no traffic

Isolated VLAN Sending Untagged Traffic

In this scenario, isolated VLAN1 on Switch 1 at interface ge-1/0/0 sends untagged traffic. The arrows in Figure 2 represent this traffic flow.

Figure 2: Isolated VLAN Sends Untagged Traffic

In this scenario, the following activity takes place on Switch 1:

• Isolated VLAN1 on interface ge-1/0/0: Learning
• pvlan100 on interface ge-1/0/0: Replication
• Traffic exits from pvlan-trunk ge-1/0/2 and ae0 with tag 50
• Community-1 and Community-2: Interfaces receive no traffic
• Isolated VLANs: Interfaces receive no traffic

In this scenario, this activity takes place on Switch 3:

• VLAN on interface ge-0/0/23 (PVLAN trunk port): Learning
• pvlan100 on interface ge0/0/23: Replication
• Promiscuous trunk port: Traffic exits from ge-0/0/0 with tag 100
• Community-1 and Community-2: Interfaces receive no traffic
• Isolated VLANs: Receive no traffic

PVLAN Tagged Traffic Sent on a Promiscuous Port

In this scenario, PVLAN tagged traffic is sent on a promiscuous port. The arrows in Figure 3 represent this traffic flow.

Figure 3: PVLAN Tagged Traffic Sent on a Promiscuous Port

In this scenario, the following activity takes place on Switch 1:

• pvlan100 VLAN on interface ae0 (PVLAN trunk): Learning
• Community-1, Community-2, and all isolated VLANs on interface ae0: Replication
• VLAN on interface ae0: Replication
• Traffic exits from pvlan-trunk ge-1/0/2 with tag 100
• Community-1 and Community-2: Interfaces receive traffic
• Isolated VLANs: Receive traffic

In this scenario, this activity takes place on Switch 3:

• pvlan100 on interface ge-0/0/0: Learning
• Community-1, Community-2 and all isolated VLANs on interface ge-0/0/0: Replication
• VLAN on interface ge-0/0/0: Replication
• Community-1 and Community-2: Interfaces receive traffic
• Isolated VLANs: Receive traffic