Virtual Leased Line Services
7750 SR OS Services Guide Page 383
control-word
Syntax [no] control-word
Context config>service>apipe>spoke-sdp
config>service>epipe>spoke-sdp
config>service>fpipe>spoke-sdp
config>service>ipipe>spoke-sdp
config>service>cpipe>spoke-sdp
Default 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). ATM N:1 cell mode pseudowires (apipe vc-types atm-vcc and atm-vpc) and VT
pseudowire (apipe vc-type atm-cell).
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.
egress
Syntax egress
config>service>apipe>spoke-sdp
config>service>cpipe>spoke-sdp
config>service>fpipe>spoke-sdp
config>service>ipipe>spoke-sdp
Description This command configures the egress SDP context.
hash-label
Syntax [no] hash-label
Context config>service>epipe>spoke-sdp
config>service>fpipe>spoke-sdp
config>service>ipipe>spoke-sdp
Description This command enables the use of the hash label on a VLL, VPLS, or VPRN service bound to LDP or
RSVP SDP as well as to a VPRN service using the autobind mode with the with the ldp, rsvp-te, or
mpls options. This feature is not supported on a service bound to a GRE SDP or for a VPRN service
using the autobind mode with the gre option..
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