Configuring access SAP bandwidth CAC

Overview

You can configure the bandwidth CAC function on a port or LAG, based on the admin bandwidth configured on a SAP and on an associate port or LAG. In addition, a booking factor is provided to allow over/under booking of the sum of the SAP bandwidth compared to the port/LAG bandwidth. See To configure bandwidth CAC on an access SAP for services or a LAG.

The goal of the CAC function is to ensure that the sum of the admin SAP bandwidth on a port or LAG does not exceed the admin bandwidth configured on that port or LAG. This ensures there is sufficient bandwidth available on the associated port or LAG before a SAP is operationally up.

This feature is supported for SAPs on all 7x50 platforms with FP2-and higher hardware on the following service sites:

• VPLS

• VPRN

• MVPLS

• EPIPE

• IPIPE

• IES

The admin bandwidth is an abstract value which could represent either the ingress or egress bandwidth; the bandwidth is a statically configured value; there is no attempt to use any dynamic bandwidth information associated with a SAP, port or LAG.

An admin bandwidth can only be configured on a SAP connected to a port or LAG which itself has an admin bandwidth configured. When a LAG is configured, the admin bandwidth and booking factor on its constituent ports are ignored.

The NFM-P tracks the requested and available bandwidth per port or LAG; where the available bandwidth is equal to the admin bandwidth on the port or LAG, with the booking factor applied, minus the sum of admin bandwidth configured on its SAPs. The SAP bandwidth CAC state is maintained on a port or LAG basis as long as the NFM-P can associate a SAP to the port or LAG. The NFM-P will perform a server validation to make sure the booking bandwidth is not more than the available bandwidth.