Page 162 7750 SR OS Services Guide
as the remote signaled dot1q value for the binding. The provisioned local dot1q tag must be stored as
the administrative dot1q value for the binding.
When the dot1q tag is not defined, the default value of zero is stored as the administrative dot1q
value. Setting the value to zero is equivalent to not specifying the value.
The no form of this command disables the command
Default no vlan-vc-tag
Parameters 0..4094 — Specifies a valid VLAN identifier to bind an 802.1Q VLAN tag ID.
adv-mtu-override
Syntax [no] adv-mtu-override
Context config>service>sdp
Description This command overrides the advertised VC-type MTU. When enabled, the router signals a VC MTU
equal to the service MTU (includes the Layer 2 header). Under normal operations it will advertise the
service MTU minus the Layer 2 header. In the receive direction, it will accept either one.
The no form of the command disables the VC-type MTU override.
Default no adv-mtu-override
class-forwarding
Syntax class-forwarding [default-lsp lsp-name]
no class-forwarding
Context config>service>sdp
Description This command enables the forwarding of a service packet over the SDP based on the class of service
of the packet. Specifically, the packet is forwarded on the RSVP LSP or static LSP whose forwarding
class matches that of the packet. The user maps the system forwarding classes to LSPs using the
config>service>sdp>class-forwarding>fc command. If there is no LSP that matches the packet’s
forwarding class, the default LSP is used. If the packet is a VPLS multicast/broadcast packet and the
user did not explicitly specify the LSP to use under the config>service>sdp>class-
forwarding>multicast-lsp context, then the default LSP is used.
VLL service packets are forwarded based on their forwarding class only if shared queuing is enabled
on the ingress SAP. Shared queuing must be enabled on the VLL ingress SAP if class-forwarding is
enabled on the SDP the service is bound to. Otherwise, the VLL packets will be forwarded to the LSP
which is the result of hashing the VLL service ID. Since there are eight entries in the ECMP table for
an SDP, one LSP ID for each forwarding class, the resulting load balancing of VLL service ID is
weighted by the number of times an LSP appears on that table. For instance, if there are eight LSPs,
the result of the hashing will be similar to when class based forwarding is disabled on the SDP. If
there are fewer LSPs, then the LSPs which were mapped to more than one forwarding class, including
the default LSP, will have proportionally more VLL services forwarding to them.
Class-based forwarding is not supported on a spoke SDP used for termination on an IES or VPRN
service. All packets are forwarded over the default LSP.
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