R0106-HP MSR Router Series MPLS Command Reference(V7)

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Parameters
remote-site-id: Specifies the remote site by its ID in the range of 0 to 65533.
Usage guidelines
This command creates an auto-discovery cross-connect that uses BGP to establish a PW from the local
site to the specified remote site.
In auto-discovery cross-connect view, you can execute ac interface to bind an AC to the auto-discovery
cross-connect. The PE can forward packets between the AC and the PW.
Examples
# Create an auto-discovery cross-connect from site 1 to site 3 in site view, and enter auto-discovery
cross-connect view.
<Sysname> system-view
[Sysname] xconnect-group bbb
[Sysname-xcg-bbb] auto-discovery bgp
[Sysname-xcg-bbb-auto] site 1 range 10
[Sysname-xcg-bbb-auto-1] connection remote-site-id 3
[Sysname-xcg-bbb-auto-1-3]
control-word enable
Use control-word enable to enable the control word function.
Use undo control-word enable to restore the default.
Syntax
control-word enable
undo control-word enable
Default
The control word function is disabled.
Views
PW class view
Predefined user roles
network-admin
Usage guidelines
The control word field is between the MPLS label stack and the Layer 2 data. It carries control information
for the Layer 2 packet, such as the sequence number.
The control word field has the following functions:
• Avoids packet disorder. In case of multipath forwarding, packets received might be disordered. You
can configure the control word function so the device reorders the packets according to the
sequence number carried in the control word field.
• Transfers specific Layer 2 frame flags, such as the FECN bit and BECN bit of Frame Relay.
• Identifies the original payload length for packets that include padding.
When the PW type is FR DLCI or ATM AAL5 SDU VCC, packets sent on the PW must carry the control
word field. The control word function cannot be controlled through configuration. When the PW type is