Alcatel-Lucent 7210 SAS M Service Guide

Virtual Private LAN Services
7210 SAS M Services Guide Page 429
Default disabled
hash-label
Syntax hash-label
no hash-label
Context config>service>vpls>spoke-sdp
config>service>vpls>mesh-sdp
Description This command enables the use of the hash label on a VLL or VPLS service bound to LDP or RSVP
SDP. This feature is not supported on a service bound to a GRE SDP. This feature is also not
supported on multicast packets forwarded using RSVP P2MP LPS or mLDP LSP in both the base
router instance and in the multicast VPN (mVPN) instance. It is, however, supported when
forwarding multicast packets using an IES spoke-interface.
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 one (1).
In order to allow applications where 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 PW packets.
Packets generated in CPM and that are forwarded labeled within the context of a service (for
example, OAM packets) must also 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 0.
igmp-snooping
Syntax igmp-snooping
Context config>service>vpls
config>service>vpls>sap
config>service>vpls>spoke-sdp
config>service>vpls>mesh-sdp
config>service>pw-template
Description This command enables the Internet Group Management Protocol (IGMP) snooping context.
Default none

Alcatel-Lucent 7210 SAS M Specifications

General

Brand	Alcatel-Lucent
Model	7210 SAS M
Category	Switch
Language	English