Creating A Ce Connection - Huawei quidway s7700 Configuration Manual

Quidway S7700 Smart Routing Switch
Configuration Guide - VPN

5.6.5 Creating a CE Connection

Context
A CE ID is used to uniquely identify a CE in a VPN. It is recommended that the CE IDs are
numbered in series starting from 1.
The CE range indicates the maximum number of CEs that a local CE can connect. According
to the prediction of the VPN expansion, you can configure a CE range larger than what is
required. This can reduce the modification of configurations when CEs are added on the VPN
in future.
You can only increase the CE range. For example, if the CE range is 10, you can increase it to
20, but cannot reduce it to 5. When the CE range is increased from 10 to 20, the system allocates
another label block whose range is 10 instead of releasing the original label block. In this case,
services are not interrupted when the CE range changes. The only way to reduce the CE range
is to delete the CE connection and re-create one.
The CE offset is the CE ID of the other local or remote CE that is connected to this CE.
The default-offset is the default CE offset. You can set the default offset to 0 or 1. Its default
value is 0. If the default offset is 1, you cannot change it to 0.
If the default offset is 0, the CE offset must be less than the CE range. If the default offset is 1,
the CE offset must be not greater than that of the CE range.
For the remote connection, the CE offset must be the same as the CE ID of the remote CE;
otherwise, the connection cannot be set up. For the local connection between two CEs, the offset
of a CE is the CE ID of the other CE.
If the CE offset is not designated when you create a CE connection, pay attention to the following
points:
l
l
If the CE ID starting from 1 is numbered in an incremental sequence and the connections are
configured according to this sequence, most connections can use the default CE offset. This
simplifies the configuration.
Do as follows on the PEs on the two ends of the VC.
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
mpls l2vpn vpn-name
The MPLS L2VPN view is displayed.
Step 3 Run:
ce ce-name id ce-id [ range ce-range ] [ default-offset ce-offset ]
Issue 01 (2011-07-15)
For the first connection of this CE, the CE offset defaults to the value of default-offset.
For other connections, the CE offset is that of the earlier connection plus 1. If the CE offset
of the earlier connection plus 1 is equal to this CE ID, then the CE offset is that of the earlier
connection plus 2.
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