Virtual Leased Line Services
7210 SAS-X, R6 OS Services Guide Page 223
Description The control word command provides the option to add a control word as part of the packet
encapsulation for pseudowire types for which the control word is optional. These are Ethernet
pseudowires (Epipe).
The configuration for the two directions of the pseudowire must match because the control word
negotiation procedures described in Section 6.2 of RFC 4447 are not supported. The C-bit in the
pseudowire FEC sent in the label mapping message is set to 1 when the control word is enabled.
Otherwise, it is set to 0.
The service will only come up if the same C-bit value is signaled in both directions. If a spoke-sdp is
configured to use the control word but the node receives a label mapping message with a C-bit clear,
the node releases the label with the an “Illegal C-bit” status code as per Section 6.1 of RFC 4447. As
soon as the user also enabled the control the remote peer, the remote peer will withdraw its original
label and will send a label mapping with the C-bit set to 1 and the VLL service will be up in both
nodes.
control-channel-status
Syntax [no] control-channel-status
Context config>service>epipe>spoke-sdp
Description Platforms Supported: 7210 SAS-T and 7210 SAS-R6.
This command enables the configuration of static pseudowire status signaling on a spoke-sdp for
which signaling for its SDP is set to OFF.
A control-channel-status no shutdown is allowed only if all of the following is true:
• The system is using network chassis mode D
• SDP signaling is off
• The control-word is enabled (control-word by default is disabled)
• The service type is epipe, apipe, vpls, cpipe, or IES/VPRN
• Mate sdp signaling is off (in vc-switched services)
• pw-path-id is configured for this spoke
The no form of this command renoves control channel status signaling form a spoke-sdp. It can only
be removed if control channel status is shutdown.
Default no control-channel-status
acknowledgment
Syntax [no] acknowledgment
Context config>service>epipe>spoke-sdp>control-channel-status
Description Platforms Supported: 7210 SAS-T and 7210 SAS-R6.
This command enables the acknowledgement of control channel status messages. By default, no
acknowledgement packets are sent.
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