Supported Platforms
Agent Circuit Identifier-Based Dynamic VLANs Components Overview
You can configure ACI-based dynamic VLAN subscriber interfaces on Modular Port Concentrators/Modular Interface Cards (MPCs/MICs) that face the access side of the network in an MX Series router.
This overview describes the components of an ACI-based dynamic VLAN configuration, from top to bottom of the interface stack:
ACI-Based Dynamic Subscriber Interface
You must create a dynamic profile to define either a dynamic PPPoE subscriber interface for PPPoE subscriber sessions, or a dynamic IP demultiplexer (IP demux) subscriber interface for DHCP subscriber sessions. The router automatically creates (instantiates) the subscriber interface when a DHCP or PPPoE subscriber logs in on the associated underlying VLAN interface associated with the dynamic profile that defines the ACI interface set.
Dynamic ACI Interface Set
The dynamic ACI interface set, which is the primary component of an ACI-based dynamic VLAN configuration, groups the DHCP and PPPoE subscriber sessions that belong to a particular household and share a common unique agent-circuit-identifier value. The router creates one ACI interface set per household to facilitate application of subscriber-based services, such as CoS and interface-shared filters, to all subscribers in the household.
You must create a dynamic profile to define the ACI interface set, which is represented in the profile by the Junos OS predefined dynamic variable $junos-interface-set-name. When a DHCP or PPPoE subscriber accesses the router on a particular interface, the router obtains the agent-circuit-identifier information from the DHCP or PPPoE control packets transmitted on that interface and dynamically creates the ACI interface set when the first subscriber from that household logs in.
Dynamic or Static Underlying VLAN Interface
After you define the ACI interface set, you must configure the underlying VLAN interface to enable creation of dynamic VLAN subscriber interfaces based on ACI information. You can configure the underlying VLAN interface either dynamically (with a dynamic profile) or statically.
ACI-based dynamic VLAN configurations support the following underlying VLAN interface types:
- Gigabit Ethernet
- 10-Gigabit Ethernet
- VLAN demux (demux0)
 | Note: When you configure an underlying VLAN interface to support creation of ACI-based dynamic VLANs, we recommend that you use this underlying interface only for subscriber interfaces that contain agent-circuit-identifier information in their DHCP or PPPoE control packets. If the router receives DHCP or PPPoE control packets without agent-circuit-identifier information on an underlying VLAN interface configured for ACI-based dynamic VLANs, the associated subscriber interfaces might not instantiate successfully. |
Static Physical Interface
ACI-based dynamic VLAN configurations support the following physical interface types:
- Gigabit Ethernet
- 10-Gigabit Ethernet
- Aggregated Ethernet
