Ambiguous Vlan Support; Configuring Ambiguous Vlans - Cisco ASR 9000 Series Configuration Manual

Establishing Subscriber Sessions
event session-start match-all
class type control subscriber PTA_CLASS do-all
1 activate dynamic-template PPP_PTA_TEMPLATE
!
!
end-policy-map
!
interface Bundle-Ether2.801
description IPoE
ipv6 enable
service-policy type control subscriber ipoe1
encapsulation dot1q 801
ipsubscriber ipv6 l2-connected
initiator dhcp

Ambiguous VLAN Support

An Ambiguous VLAN is configured with a range or group of VLAN IDs. The subscriber sessions created
over ambiguous VLANs are identical to subscribers over regular VLANs that support all regular configurations
such as policy-map, VRFs, QoS, and ACL. Multiple subscribers can be created on a particular VLAN ID as
long as they contain a unique MAC address. Ambiguous VLANs enhance scalability by reducing the need
for configuring multiple access interfaces.
To enable DHCPv6 support, ambiguous VLANs are unnumbered on top of the bundle interface.
The ambiguous VLANs are named exactly the same way as regular VLANs. The ambiguous VLANs are
Note
considered Layer 3 interfaces in contrast to EFP ranges allowed for l2transport interface.
When DHCPv6 Server receives a SOLICIT message on the ambiguous VLAN interface, the VLAN IDs are
extracted from the received packet and used for authenticating the subscriber with the client related information.
When an interface configuration is changed from ambiguous to non-ambiguous or vice-versa or Ambiguous
VLAN range is changed, then all existing client bindings for the Ambiguous VLAN are cleared.
For more information on configuring ambiguous VLAN, see

Configuring Ambiguous VLANs

Perform this task to configure ambiguous vlans.
There is no DHCP-specific configuration required for ambiguous VLANs.
Note
OL-28375-03
Cisco ASR 9000 Series Aggregation Services Router Broadband Network Gateway Configuration Guide, Release
DHCPv6 Features
Configuring Ambiguous VLANs, on page 161.
4.3.x
161