Specifications

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Cisco IGX 8400 Series Provisioning Guide, Release 9.3.3 and Later Releases
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Chapter 10 Cisco IGX 8400 Series IP Service
IP Service—Functional Overview
• MPLS Virtual Private Networks (VPNs)
• IPsec-VPN with installation of the AIM-VPN/HP module
To configure the URM for any IP service, you must use both switch software and Cisco IOS commands.
See Chapter 2, “Functional Overview” for more information on basic URM installation and setup.
Virtual Slave Interfaces
Note VSIs can only be configured on the UXM or UXM-E card sets. FR support for VSI controllers functions
through FRF.8 service interworking on the UXM or UXM-E front card.
VSIs allow a node to be managed by multiple controllers, such as MPLS.
In the VSI control model, a controller sees the switch as a collection of slaves with their interfaces. The
controller can establish connections between any two interfaces, using the resources allocated to its
partition. For example, an MPLS controller can only access interfaces that have been configured in the
MPLS controller’s partition.
A VSI interface becomes available to the controller after the VSI partition is created and enabled. The
controller manages its partition through the VSI protocol and runs the VSI master. The VSI master
interacts with each VSI slave in the VSI partition and sets up and terminates VSI connections.
A maximum of three VSI partitions can be enabled on the IGX. These VSI partitions can function
together or independently, and are in addition to AutoRoute on each interface.
VSIs on the IGX provide the following features:
• Class of Service (CoS) templates
• Partitions on port and trunk interfaces
• Virtual trunk support for VSI
• SV+ support for VSI
• Maximum of three controllers
For information on configuring VSI partitions and VSIs on the IGX, see the “VSI Configuration” section
on page 10-34.
VSI Masters and Slaves
A controller application uses a VSI master to control one or more VSI slaves. For an IGX without a
URM, the controller application and Master VSI reside in an external router and the VSI slaves exist in
UXM cards on the IGX node (see Figure 10-1).
IGX nodes with an installed URM utilize the embedded router on the URM front card as the location for
the controller application and the Master VSI.