•
The range of ATM VPIs used as interface labels for major interfaces stacked on ATM
AAL5 interfaces, configured with the mpls atm vpi range command.
•
The range of ATM VCIs used as interface labels for major interfaces stacked on ATM
AAL5 interfaces, configured with the mpls atm vci range command.
MPLS Minor Interfaces
When you configure an LSP with the interface tunnel mpls command, RSVP-TE creates
an MPLS minor interface to represent the head of the LSP. MPLS minor interfaces are
also created by RSVP-TE on the transit and tail LSRs when the LSP is signaled. Only
RSVP-TE creates MPLS minor interfaces. Neither BGP nor LDP create them.
These minor interfaces are used to associate policy or a QoS profile with an LSP (either
on an LSR or an LER). This minor interface is created automatically by the signaling
protocol. Minor interfaces are not saved in NVS. Use the show mpls interface minor
command to view the minor interfaces.
The following attributes of the minor interface are set by RSVP-TE:
•
The UID of the minor interface, assigned automatically when the interface is created.
•
The operational state of the interface, up or down.
•
Whether the interface is an ingress MPLS minor interface used to receive traffic or an
egress MPLS minor interface used to transmit traffic.
MPLS Shim Interfaces
MPLS shim interfaces are stacked on layer 2 interfaces to provide layer 2 services over
MPLS or to create local cross-connects by cross-connecting the layer 2 interface to
another layer 2 interface. For more information about MPLS shim interfaces, see
Configuring Layer 2 Services over MPLS.
Interface Stacking
MPLS interface stacking differs depending on whether the platform label space (Figure
56 on page 237) or the interface label space (Figure 57 on page 238) is used.
Figure 56: MPLS Interface Stacking for the Platform Label Space
237Copyright © 2010, Juniper Networks, Inc.
Chapter 3: MPLS Overview
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