Sdp Diagnostics; Sdp Ping; Sdp Mtu Path Discovery - Alcatel-Lucent 7750 SR OS Service Manual

SDP Diagnostics

The 7750 SR OS SDP diagnostics are SDP ping and SDP MTU path discovery.

SDP Ping

SDP ping performs in-band uni-directional or round-trip connectivity tests on SDPs. The SDP
ping OAM packets are sent in-band, in the tunnel encapsulation, so it will follow the same path as
traffic within the service. The SDP ping response can be received out-of-band in the control plane,
or in-band using the data plane for a round-trip test.
For a uni-directional test, SDP ping tests:
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For a round-trip test, SDP ping uses a local egress SDP ID and an expected remote SDP ID. Since
SDPs are uni-directional tunnels, the remote SDP ID must be specified and must exist as a
configured SDP ID on the far-end 7750 SR. SDP round trip testing is an extension of SDP
connectivity testing with the additional ability to test:
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SDP MTU Path Discovery

In a large network, network devices can support a variety of packet sizes that are transmitted
across its interfaces. This capability is referred to as the Maximum Transmission Unit (MTU) of
network interfaces. It is important to understand the MTU of the entire path end-to-end when
provisioning services, especially for virtual leased line (VLL) services where the service must
support the ability to transmit the largest customer packet.
The Path MTU Discovery tool provides a powerful tool that enables service provider to get the
exact MTU supported between the service ingress and service termination points (accurate to one
byte).
7750 SR OS Services Guide
Egress SDP ID encapsulation
Ability to reach the far-end IP address of the SDP ID within the SDP encapsulation
Path MTU to the far-end IP address over the SDP ID
Forwarding class mapping between the near-end SDP ID encapsulation and the far-end
tunnel termination
Remote SDP ID encapsulation
Potential service round trip time
Round trip path MTU
Round trip forwarding class mapping
OAM and SAA
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