Specifications

23-13
Cisco BPX 8600 Series Installation and Configuration
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001
Chapter 23 Configuring BXM Virtual Switch Interfaces
Overview: How VSI Works
Figure 23-4 Cross Connects and Links between Switches
Connection Admission Control
When a connection request is received by the VSI Slave, it is first subjected to a Connection Admission
Control (CAC) process before being forwarded to the FW layer responsible for actually programming
the connection. The granting of the connection is based on the following criteria:
LCNs available in the VSI partition:
• Qbin
• Service Class
QoS guarantees:
• max CLR
• max CTD
• max CDV
When the VSI slave accepts (that is, after CAC) a connection setup command from the VSI master in
the MPLS Controller, it receives information about the connection including service type, bandwidth
parameters, and QoS parameters. This information is used to determine an index into the VI’sselected
Service Template’s VC Descriptor table thereby establishing access to the associated extended
parameter set stored in the table.
Service templates used for egress traffic are described here.
Ingress traffic is managed differentlyand a pre-assigned ingress service template containing CoS Buffer
linksisused.
Switch
17714
MLPS controller
Slave
Slave
Switch
CPE
CPE
1
2
2
2
1
= Link
= Cross-connect
Application
Master
Application
Master
MLPS controller
Slave
Slave
Slave
Slave
Slave