Alcatel-Lucent 7750 SR Manual page 995

Os services guide

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config>service>ies>>if>spoke-sdp

config>service>ies>redundant-interface>spoke-sdp

This command configures the egress SDP context.

[no] vc-label egress-vc-label

config>service>ies>if>spoke-sdp>egress

config>service>ies>redundant-interface>spoke-sdp>egress

This command configures the static MPLS VC label used by this device to send packets to the far-end

device in this service via this SDP.

egress-vc-label — A VC egress value that indicates a specific connection.

[no] hash-label

config>service>ies>interface>spoke-sdp

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..

When this feature is enabled, the ingress data path is modified such that the result of the hash on the

packet header is communicated to the egress data path for use as the value of the label field of the

hash label. The egress data path appends the hash label at the bottom of the stack (BoS) and sets the

S-bit to 1 to indicate that.

In order to allow for applications whereby the egress LER infers the presence of the hash label

implicitly from the value of the label, the Most Significant Bit (MSB) of the result of the hash is set

before copying into the hash label. This means that the value of the hash label will always be in the

range [524,288 — 1,048,575] and will not overlap with the signaled/static LSP and signaled/static

service label ranges. This also guarantees that the hash label will not match a value in the reserved

label range.

The (unmodified) result of the hash continues to be used for the purpose of ECMP and LAG spraying

of packets locally on the ingress LER. Note however that for VLL services, the result of the hash is

overwritten and the ECMP and LAG spraying will be based on service-id when ingress SAP shared

queuing is not enabled. However, the hash label will still reflect the result of the hash such that an

LSR can use it to perform fine grained load balancing of VLL pseudowire packets.

7750 SR OS Services Guide

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IES Service Configuration Commands