Global Service Configuration Commands
Page 92 7750 SR OS Services Guide
Description This command overrides the advertised VC-type MTU. When enabled, the SR-Series signals a VC
MTU equal to the service MTU (includes the L2 header). Under normal operations it will advertise
the service MTU minus the L2 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. Otherwise, the class-forwarding command has no effect and all packets of the
VLL will be forwarded on one LSP of the SDP.
The no form of the command deletes the configuration and the SDP reverts back to forwarding
service packets based on the hash algorithm used for LAG and ECMP.
Default no class-forwarding — Packets of a service bound to this SDP will be forwarded based on the hash
algorithm used for LAG and ECMP.
Parameters default-lsp lsp-name — Specifies the default LSP for the SDP. This LSP name must already exist
and must have been associated with this SDP using the config>service>sdp>lsp command. The
default LSP is used to forward packets when there is no available LSP matching the packet’s
forwarding class. This is possible if the LSP associated with the packet's forwarding class is
down, or if the LSP does not exist. The default LSP is also used to forward VPLS service
multicast/broadcast packets in the absence of a user configuration indicating an explicit
association to one of the SDP LSPs.
Note that when the default LSP is down, the SDP is also brought down.
fc
Syntax fc {be | l2 | af | l1 | h2 | ef | h1 | nc} lsp lsp-name
no fc {be | l2 | af | l1 | h2 | ef | h1 | nc}
Context config>service>sdp>forwarding-class
Description This command makes an explicit association between a forwarding class and an LSP. The LSP name
must exist and must have been associated with this SDP using the command config>service>sdp>lsp.
Multiple forwarding classes can be associated with the same LSP. However, a forwarding class can
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