Juniper JUNOSE 11.1.X - LINK LAYER CONFIGURATION 4-7-2010, Configuration Manual

Page: 698 / 774

As a final step, you must issue “auto-configure vlan” on page 672 . This command
configures the VLAN major interface to support autodetection of the VLAN dynamic
encapsulation type.
When the router receives an incoming data packet on a circuit, it dynamically creates
the VLAN subinterface, using the attributes specified in the base profile. After
examining the contents of the data packet, the router dynamically creates the required
interface columns above the VLAN subinterface, using the configuration attributes
contained in the nested profiles, if specified, or in the base profile itself.
Overriding Base Profile Assignments
You can also use the profile vlan override bulk-config command to assign an
overriding profile to a single VLAN ID or double-tagged S-VLAN ID that exists within
a bulk-configured VLAN subrange. The VLAN ID subrange that encompasses the
major interface must have been previously configured with the
vlan bulk-config
command for use by a dynamic VLAN subinterface. After you assign the overriding
profile, the router uses the information in this profile instead of the information in
the previously assigned base profile to create any subsequent VLAN dynamic
subinterface columns on the specified VLAN major interface, as long as they match
the VLAN or S-VLAN specified in the override.
The overriding profile, like the original base profile, can include VLAN attributes,
nested profile assignments, and individual characteristics for dynamic upper-interface
encapsulation types.
Overriding the base profile assignment for a VLAN with a profile enables you to create
a special profile for a subscriber in a DSLAM. For example, you can use the overriding
profile to create dynamic VLAN subinterfaces for subscribers with an S-VLAN ID of
200 and a VLAN ID of 100.
You can also use an overriding profile with debugging attributes to troubleshoot
problems with VLAN dynamic subinterface columns.
For configuration instructions and examples, see “Configuring Overriding Profile
Assignments for VLAN Major Interfaces” on page 670.
NOTE: See JUNOSe Release Notes , Appendix A , System Maximums for information
about the maximum number of overriding profile assignments currently supported
per chassis.
Changing VLAN Subranges
You can add, remove, modify, merge, disable, and enable VLAN subranges within
an existing bulk-configured VLAN range.
For configuration instructions and examples, see “Changing VLAN Subranges” on
page 680.
666 ■
Configuring VLAN Dynamic Subinterfaces
JUNOSe 11.1.x Link Layer Configuration Guide