H3C Technologies H3C S6800 Series Switches - Manual (Page 13)

6
Configuring an S-channel
Creating an S-channel
An S-channel is automatically created by CDCP, and the system automatically saves the configuration in
the configuration file on the bridge. You can also manually create an S-channel by performing this task.
If an (SCID, SVID) pair for an S-channel is created both automatically and manually, the one
automatically created takes precedence.
After an S-channel is created, an S-channel interface or S-channel aggregate interface is generated.
Removing an S-channel also removes the S-channel interface or S-channel aggregate interface. A
manually created S-channel interface or S-channel aggregate interface operates in access mode. An
S-channel interface or S-channel aggregate interface that is automatically created through CDCP
operates in trunk mode.
An S-channel interface is associated with the S-channel that is created on a Layer 2 Ethernet interface. An
S-channel aggregate interface is associated with the S-channel that is created on a Layer 2 aggregate
interface.
The device checks C-VLAN tagged frames (frames taking the original VLAN tags) entering an S-channel
for their C-VLAN tags. If the C-VLAN does not belong to the VLANs that the S-channel and the port where
the S-channel is created permit, the device cannot transmit the frames. Therefore, you must specify the
C-VLAN range for the frames that an S-channel can transmit before you assign the S-channel and the port
where the S-channel is created to these C-VLANs. For more information about assigning ports to a VLAN,
see Layer 2—LAN Switching Configuration Guide.
When you create an S-channel, follow these guidelines:
• Create an S-channel on an interface with EVB enabled. Otherwise, an error message appears.
• After EVB is enabled on an interface, a default S-channel (with both SCID and SVID as 1) is
automatically created.
• When you manually create an S-channel, do not use the SCID or SVID being used by any other
S-channel. Otherwise, an error message appears.
• To manually create or remove S-channel, disable CDCP that automatically performs these
operations.
To create an S-channel:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter Layer 2 Ethernet
interface view or Layer 2
aggregate interface view.
interface interface-type
interface-number
N/A
3. Create an S-channel.
evb s-channel channel-id
service-vlan svlan-id
By default, only an automatically
created default S-channel (with
both SCID and SVID as 1) exists on
an interface with EVB enabled.