Cisco BPX 8650, Installation And Configuration Manual

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Cisco BPX 8600 Series Installation and Configuration
Release 9.3.30, Part Number 78-12907-01 Rev. E0, May 2005
Chapter 23 Configuring BXM Virtual Switch Interface
Overview: How VSI Works
Compatibility
The card uses a flag in the capability message to report multiple partition capability. Firmware releases
that do not support multiple partitions set this flag off. The multiple partitions capability is treated as a
card attribute and added to the attribute list.
Use of a partition with an ID higher than 1 requires support for multiple VSI partitions in both switch
software and BXM firmware, even if this is the only partition active on a the card. In a Y-red pair
configuration, the multiple partition capability is determined by the minimum of the two cards.
A card with no multiple partition capabilities will mismatch if any of the interfaces has an active partition
with ID higher than 1. Attempts to enable a partition with ID higher than 1 in a logical card that does not
support multiple partitions are blocked.
Resource Partitioning
A logical switch is configured by enabling the partition and allocating resources to the partition. This
must be done for each of the interfaces in the partition. The same procedure must be followed to define
each of the logical switches. As resources are allocated to the different logical switches, a partition of
the switch resources is defined.
The resources that are partitioned amongst the different logical switches are:
•
LCNs
•
Bandwidth
• VPI range
Resources are configured and allocated per interface, but the pool of resources may be managed at a
different level. The pool of LCNs is maintained at the card level, and there are also limits at the port
group level. The bandwidth is limited by the interface rate, and therefore the limitation is at the interface
level. Similarly the range of VPI is also defined at the interface level.
You configure the following parameters on a VSI partition on an interface:
•
min lcn : guaranteed LCNs for the partition on the interface.
•
max lcn : total number of LCNs the partition is allowed for setting up connections on the interface.
•
min bw : guaranteed bandwidth for the partition on the interface.
• max bw : maximum bandwidth for this partition on the interface.
•
start vpi : the lower bound of the VPI range reserved for this partition on the interface.
• end vpi : the upper bound of the VPI range reserved for this partition on the interface.
Partitioning Between Automatic Routing Management and VSI
In addition to partitioning of resources between VSI and Automatic Routing Management, multiple
partitioning allows subpartitioning of the VSI space among multiple VSI partitions. Multiple VSI
controllers can share the switch with each other and also with Automatic Routing Management.
The difference between the two types of partitioning is that all the VSI resources are under the control
of the VSI-slave, while the management of Automatic Routing Management resources remains the
province of the switch software.