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Tunneling Protocols
To perform DSCP marking on the external IP header, use the following command:
Shut down the linecard. (This is a root level command.)
Step 1
From the SCE(config if)#> prompt, type shutdown and press Enter.
Configure the DSCP marking.
Step 2
From the SCE(config if)#> prompt, type no ip-tunnel IPinIP DSCP-marking-skip and press Enter.
Enables DSCP marking on the external IP header of IPinIP traffic.
Step 3
Restart the linecard.
From the SCE(config if)#> prompt, type no shutdown and press Enter.
Configuring the VLAN Environment
Use this command to configure the VLAN environment.
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Options
There are three options:
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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.
Using the a-symmetric skip value incurs a performance penalty.
Note
From the SCE(config if)# prompt, type vlan {symmetric classify | symmetric skip |a-symmetric skip}
Step 1
and press Enter.
Specify the desired VLAN mode.
Cisco SCE 2000 and SCE 1000 Software Configuration Guide
6-10
Options, page 6-10
Configuring the VLAN Environment: Example, page 6-11
symmetric classify
symmetric skip (default)
a-symmetric skip
Chapter 6
Configuring the Line Interface
OL-7827-12
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