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Презентация была опубликована 10 лет назад пользователемВера Савосина
1 © 2006 Cisco Systems, Inc. All rights reserved. MPLS v Label Assignment and Distribution Introducing MPLS Label Allocation, Distribution, and Retention Modes
2 © 2006 Cisco Systems, Inc. All rights reserved. MPLS v Outline Overview Label Distribution Parameters Distributing Labels Allocating Labels Retaining Labels Summary
3 © 2006 Cisco Systems, Inc. All rights reserved. MPLS v Label Distribution Parameters Frame-mode MPLS architecture defines several label allocation and distribution parameters: Per-platform label space Unsolicited downstream label distribution Independent label allocation control Liberal label retention
4 © 2006 Cisco Systems, Inc. All rights reserved. MPLS v Label Distribution: Unsolicited Downstream The label for a prefix is allocated and advertised to all neighbor LSRs, regardless of whether the neighbors are upstream or downstream LSRs for the destination.
5 © 2006 Cisco Systems, Inc. All rights reserved. MPLS v Label Allocation: Independent Control An LSR can always assign a label for a prefix, even if it has no downstream label. Independent control can be used only for LSRs with Layer 3 capabilities.
6 © 2006 Cisco Systems, Inc. All rights reserved. MPLS v Label Retention: Liberal Retention Mode Each LSR stores the received label in its LIB, even when the label is not received from a next-hop LSR. Liberal label retention mode improves convergence speed.
7 © 2006 Cisco Systems, Inc. All rights reserved. MPLS v Summary There are four MPLS label distribution parameters: label space, label distribution, label allocation, and label retention. Frame-mode MPLS distributes labels using downstream unsolicited label distribution Frame-mode MPLS allocates labels to neighbors using independent control Frame-mode MPLS uses liberal label retention
8 © 2006 Cisco Systems, Inc. All rights reserved. MPLS v2.22-8
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