This feature provides a bandwidth Connection Admission Control (CAC) function per port or LAG based on an administrator bandwidth configured on a SAP and on the associated port or LAG. A booking factor is provided to allow overbooking or underbooking of the sum of the SAP bandwidth compared to the port or LAG bandwidth.
The administrator bandwidth is a statically configured abstract value that could represent either the ingress or egress bandwidth, or both.
The goal of the CAC function is to ensure that the sum of the administrator SAP bandwidth on a port or LAG does not exceed the administrator bandwidth configured on that port or LAG.
This feature is supported on all service Ethernet SAPs, excluding PW SAPs, Ethernet tunnels and subscriber group interface SAPs. It is not supported in a VPLS or Epipe SAP template. It is applicable to both access and hybrid ports or LAGs; in the case of a hybrid port or LAG, the SAP CAC bandwidth only applies to the access operation.
By default, a SAP, port, or LAG has no administrator bandwidth configured, in which case it is excluded from the CAC function. Configuring an administrator bandwidth on a SAP enforces the CAC function.
An administrator bandwidth can only be configured on a SAP that is connected to a port or LAG on which an administrator bandwidth is already configured. When a LAG is configured, the administrator bandwidth and booking factor on its constituent ports are ignored.
The system tracks the requested and available bandwidth per port or LAG, where the available bandwidth is equal to the administrator bandwidth on the port or LAG, with the booking factor applied, minus the sum of administrator bandwidth configured on its SAPs. An attempt to increase a SAP's administrator bandwidth fails if there is insufficient available bandwidth on its port or LAG.
Use the following CLI commands to configure the administrator bandwidth and booking factor for the port or LAG.
configure
lag <lag-id>
access
bandwidth <bw-value>
booking-factor <percentage>
port <port-id>
ethernet
access
bandwidth <bw-value>
booking-factor <percentage>
service
[ cpipe | epipe | ipipe | vpls] <service-id>
sap <sap-id>
bandwidth <bw-value>
[ies | vprn] <service-id>
interface <ip-int-name>
sap <sap-id>
bandwidth <bw-value>
Dynamic changes in administrator bandwidth and booking factor are possible without having to disable the SAP, port, or LAG.
A SAP is allocated bandwidth on a port or LAG regardless of whether the SAP and port or LAG are administratively or operationally up or down. The administrator bandwidth must be removed from the SAP configuration to free up its bandwidth on the port or LAG. Actions such as clearing the card or MDA, power cycling the card, or removing and reinserting a card or MDA do not change the CAC state of the SAP and port or LAG.