Alcatel-Lucent 7750 SR-OS, Руководство по настройке

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IP Router Configuration
7750 SR OS Router Configuration Guide Page 21
Network Domains
In order to determine which network ports (and hence which network complexes) are eligible to
transport traffic of individual SDPs, network-domain is introduced. This information is then used
for the sap-ingress queue allocation algorithm applied to VPLS SAPs. This algorithm is optimized
in such a way that no sap-ingress queues are allocated if the given port does not belong to the
network-domain used in the given VPLS. In addition, sap-ingress queues will not be allocated
towards network ports (regardless of the network-domain membership) if the given VPLS does not
contain any SDPs.
Sap-ingress queue allocation takes into account the following aspects:
• SHG membership of individual SDPs
• Network-domain definition under SDP to restrict the topology the given SDP can be set-
up in
The implementation supports four network-domains within any given VPLS.
Network-domain configuration at the SDP level is ignored when the given SDP is used for Epipe,
Ipipe, or Apipe bindings.
Network-domain configuration is irrelevant for Layer 3 services (Layer 3 VPN and/or IES
service). It can be defined in the base routing context and associated only with network interfaces
in this context. Network domains are not applicable to loopback and system interfaces.
The network-domain information will only be used for ingress VPLS sap queue-allocation. It will
not be taken into account by routing during SDP setup. As a consequence, if the given SDP is
routed through network interfaces that are not part of the configured network domain, the packets
will be still forwarded, but their QoS and queuing behavior will be based on default settings. In
addition, the packet will not appear in SAP stats.
There will be always one network-domain that exists with reserved name default. The interfaces
will always belong to a default network-domain. It will be possible to assign given interface to
different user-defined network-domains. The loopback and system interface will be also associated
with the default network-domain at the creation. However, any attempt to associate such interfaces
with any explicitly defined network-domain will be blocked at the CLI level as there is no benefit
for that association.
Any SDP can be assigned only to one network domain. If none is specified, the system will assign
the default network-domain. This means that all SAPs in VPLS will have queue reaching all fwd-
complexes serving interfaces that belong to the same network-domains as the SDPs.
It is possible to assign/remove network-domain association of the interface/SDP without requiring
deletion of the respective object.