6-6
Cisco SCE8000 Software Configuration Guide
OL-16479-02
Chapter 6 Configuring the Line Interface
Tunneling Protocols
To perform DSCP marking on the external IP header, use the following command:
Step 1 From the SCE(config-if)# prompt, type no ip-tunnel IPinIP DSCP-marking-skip and press Enter.
How to Configure the VLAN Environment
Use this command to configure the VLAN environment.
• Options, page 6-6
• Configuring the VLAN Environment: Example, page 6-6
Options
There are three options:
• symmetric classify
• symmetric skip (default)
• a-symmetric skip
Symmetric environment refers to an environment in which the same VLAN tags are used for carrying a
transaction in the upstream and downstream directions
Setting the mode to classify means that VPN and flow classification will use the VLAN tag. Using
VLAN classification is mutually exclusive with other tunnel-based classification or IP tunnels.
An a-symmetric environment is an environment in which the VLAN tags might not be the same in the
upstream and downstream directions of the same flow.
The SCE platform is configured by default to work in symmetric environments. A specific command
should be used to allow correct operation of the SCE platform in asymmetric environments and instruct
it to take into consideration that the upstream and downstream of each flow has potentially different
VLAN tags.
Note Using the a-symmetric skip value incurs a performance penalty.
Step 1 From the SCE(config if)# prompt, type vlan {symmetric classify | symmetric skip |a-symmetric skip}
and press Enter.
Specify the desired VLAN mode.
Configuring the VLAN Environment: Example
The following example selects VLAN-based classification.
SCE(config if)#vlan symmetric classify
How to Configure the L2TP Environment
• External Fragmentation in the L2TP Environment, page 6-7
• Options, page 6-7
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