FD 100/320Gbps NT and FX NT IHub Services Guide Virtual Leased Line ServicesIssue: 13 3HH-11985-AAAA-TQZZA 1354.6.5.2 control-wordTable 68 control-word command4.6.5.3 hash-labelTable 69 hash-label commandItem DescriptionSyntax [no] control-wordContext configure>service>epipe>spoke-sdpDescription This command indicates whether the control word is used or not. The value of the control wordis negotiated with the peer.The control word is indicated in the label message as part of pseudowire ID FEC as the C-bit.The control word is not mandatory for an Epipe service. Therefore the usage of the controlword is negotiated between the endpoints of the pseudowire.Item DescriptionSyntax [no] hash-labelContext configure>service>epipe>spoke-sdpDescription This command enables the use of the hash label on a VLL, or VPLS service bound to LDPSDP.When this feature is enabled, the ingress LER is modified so that the result of the hash on theingress packet header is communicated to the egress data path for use as index to select thevalue of the label field of the hash label. The egress data path has a set of 128 different labelfield values in the range 524.288 - 1.048.575. The egress data path appends the hash label atthe bottom of the stack (BoS) and sets the S-bit to 1 to indicate that.The hash label, also referred to as entropy label, allows LSR nodes in a network to loadbalance labeled packets in a more granular fashion than allowed by simply hashing on thestandard label stack. It also removes the need to have an LSR inspect the payload below thelabel stack to check for an IPv4 or IPv6 header.Since the ingress LER hashing routine maintains packet ordering within a conversation, thisguarantees that when an LSR sprays the packets over multiple LDP ECMP paths or multiplepaths over a LAG network port by hashing the extended label stack including the hash label,the LSR will also maintain packet ordering within a conversation.Packets that are generated inCPM and forwarded labeled within the context of a service (for example, OAM packets) mustalso include a hash label at the BoS and set the S-bit accordingly.The TTL of the hash label is set to a value of 1.The no form of this command disables the use of the hash label.Default no hash-label
