S-Vlan Oversubscription - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - LINK LAYER CONFIGURATION GUIDE 2010-10-13 Configuration Manual

JunosE 11.3.x Link Layer Configuration Guide
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Specify VLAN as the encapsulation method.
2.
host1(config-if)#encapsulation vlan
This command creates the VLAN major interface.
Create a VLAN subinterface by adding a subinterface number to the interface identifier.
3.
host1(config-if)#interface fastEthernet 3/1.1
Assign an S-VLAN ID and a VLAN ID for the subinterface.
4.
host1(config-if)#svlan id 3 300
Assign an S-VLAN Ethertype.
5.
host1(config-if)#svlan ethertype 9200
Specify PPPoE as the encapsulation method on the interface.
6.
host1(config-subif)#encapsulation pppoe
This command creates the PPPoE major interface.
Assign a profile.
7.
host1(config-subif)#pppoe profile pppoeProfile3
Configure the interface to detect and accept dynamic PPPoE subinterfaces.
8.
host1(config-subif)#pppoe auto-configure

S-VLAN Oversubscription

When you configure S-VLAN subinterfaces over Ethernet interfaces to support dynamic
PPPoE subinterfaces, you can take advantage of S-VLAN oversubscription.
The maximum number of S-VLANs that you can create per I/O module or IOA with PPPoE
major interfaces stacked over them is greater than the maximum number of dynamic
PPPoE subinterfaces. The maximum number of PPP interfaces supported per line module
is directly proportional to the maximum number of PPPoE subinterfaces.
As a result, you can oversubscribe S-VLANs by configuring up to the maximum number
of S-VLANs supported on the I/O module or IOA, knowing that no more than the maximum
number of supported PPP sessions can be connected to the router at any one time.
For information about the module combinations that support S-VLAN oversubscription,
see "S-VLAN Oversubscription" on page 185 in "Configuring VLAN and S-VLAN
Subinterfaces" on page 167.
For specific information about the maximum number of S-VLANs supported per I/O
module or IOA and the maximum number of PPP interfaces and PPPoE subinterfaces
supported per line module, see JunosE Release Notes, Appendix A, System Maximums.
Copyright © 2010, Juniper Networks, Inc.