Configuration Commands
Page 1352 7750 SR OS Services Guide
An SDP is a logical mechanism that ties a far end 7750 SR to a specific service without having to
define the far-end SAP. Each SDP represents a method to reach a 7750 SR.
One method is the IP Generic Router Encapsulation (GRE) encapsulation, which has no state in the
core of the network. GRE does not specify a specific path to a 7750 SR router. A GRE-based SDP
uses the underlying IGP routing table to find the best next hop to the far end router.
The other method is Multi-Protocol Label Switching (MPLS) encapsulation. 7750 SR routers support
both signaled and non-signaled LSPs (Label Switched Path) though the network. Non-signaled paths
are defined at each hop through the network. Signaled paths are protocol communicated from end to
end using RSVP. Paths may be manually defined or a constraint based routing protocol (i.e., OSPF-
TE or CSPF) can be used to determine the best path with specific constraints.
SDPs are created and then bound to services. Many services can be bound to a single SDP. The oper-
ational and administrative state of the SDP controls the state of the SDP binding to the service.
An egress service label (Martini VC-Label), used by the SDP to differentiate each service bound to
the SDP to the far-end router, must be obtained manually or though signaling with the far end. If man-
ually configured, it must match the ing-svc-label defined for the local router.
The no form of the command removes the SDP binding from the mirror destination service. Once
removed, no packets are forwarded to the far-end (destination) router from that mirror destination ser-
vice ID.
Default No default SDP ID is bound to a mirror destination service ID. If no SDP is bound to the service, the
mirror destination will be local and cannot be to another 7750 SR over the core network.
Parameters sdp-id
[:vc-id] — A locally unique SDP identification (ID) number. The SDP ID must exist. If the sdp-
id does not exist, an error will occur and the command will not execute.
For mirror services, the vc-id defaults to the service-id. However, there are scenarios where the
vc-id is being used by another service. In this case, the SDP binding cannot be created. So, to
avoid this, the mirror service SDP bindings now accepts vc-ids.
Values 1 — 17407
egr-svc-label label — The egr-svc-label keyword is used to define the egr-svc-label used to identify
this mirror-dest over this sdp-id. The egr-svc-label must be explicitly configured.
The specified egr-svc-label must be locally unique within this 7750 SR and match the far end
expected specific ing-svc-label for this 7750 SR. It must be within the range specified for manu-
ally configured service labels defined on this 7750 SR.
Default None — Must be explicitly configured.
Values 16 — 1048575
tldp — Specifies that the label is obtained through signaling via the LDP.
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