User guide

Chapter 7 Line Configuration
Entering LineCard Interface Configuration Mode
SCE 1000 2xGBE Release 2.0.10 User Guide
7-2 OL-7117-02
Entering LineCard Interface Configuration Mode
The following procedure is for entering Line Card Interface Configuration mode. The procedures
for entering the other interfaces are the same except for the interface command as described above
and in CLI Command Reference (on page A-1).
To enter LineCard Interface Configuration mode:
Step 1 To enter Global Configuration Mode, at the SCE 1000# prompt, type configure, and
press Enter.
The SCE 1000(config)# prompt appears.
Step 2 Type interface LineCard 0, and press Enter.
The SCE 1000(config if)# prompt appears.
Step 3 To return to Global Configuration Mode, type exit and press Enter.
The SCE 1000(config)# prompt appears.
Step 4 To exit Global Configuration Mode, type exit and press Enter.
The SCE 1000# prompt appears.
Configuring Tunneling Protocols
Tunneling technology is used across various telecommunications segments in order to solve a
wide variety of networking problems. The SCE 1000 Platform is designed to recognize various
tunneling protocols. When the SCE 1000 is installed in an L2TP, MPLS or VLAN environment, it
is able to ignore the tunnel headers and skip into the higher L3 layer for protocol classification
A tunneling protocol adds headers to the basic protocol stack in order to route the packet across
the telecommunications segments. Therefore, the system must be aware that the packets contain
additional tunnel headers. Based on the selected protocol, the system skips the tunnel (outer IP
headers and tunnel headers) and processes only to the internal IP header and the data.
Since VLAN and MPLS constitute headers at layers just above L2 and below any L3 layer, they
are automatically recognized as tunnels regardless of the system configuration, with the exception
that MPLS label stacks have a maximum depth of 15 labels.
In addition to skipping the tunnel VLAN and MPLS tunnel headers, the SCE 1000 is also able to
differentiate flows and differentiate subscribers (i.e. use the VLAN information for classification
purposes) according to the VLAN tag when configured in the correct mode. VLAN classification
is possible only for symmetric tunnels, that is, when the VLAN tags of every tunnel are identical
for both the upstream and downstream direction (of that tunnel).
The default system mode is the following:
• Skip VLAN headers, do-not use them for classification.
The VLAN environment is assumed to be symmetric.