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Understanding MPLS and Path Protection on J-EX Series Switches
Junos OS MPLS for J-EX Series Switches provides path protection to protect your MPLS
network from label switched path (LSP) failures.
By default, an LSP routes itself hop-by-hop from the ingress provider edge switch through
the provider switches toward the egress provider edge switch. The LSP generally follows
the shortest path as dictated by the local routing table, usually taking the same path as
destination-based, best-effort traffic. These paths are “soft” in nature because they
automatically reroute themselves whenever a change occurs in a routing table or in the
status of a node or link.
Typically, when an LSP fails, the switch immediately upstream from the failure signals
the outage to the ingress provider edge switch. The ingress provider edge switch calculates
a new path to the egress provider edge switch, establishes the new LSP, and then directs
traffic from the failed path to the new path. This rerouting process can be time-consuming
and prone to failure. For example, the outage signals to the ingress switch might get lost
or the new path might take too long to come up, resulting in significant packet drops.
You can configure path protection by configuring primary and secondary paths on the
ingress switch. If the primary path fails, the ingress switch immediately reroutes traffic
from the failed path to the standby path, eliminating the need for the ingress switch to
calculate a new route and signal a new path. For information about configuring standby
LSPs, see “Configuring Path Protection in an MPLS Network (CLI Procedure)” on page 3097.
Related
Documentation
Junos OS MPLS for J-EX Series Switches Overview on page 3057
•
•
Understanding Junos OS MPLS Components for J-EX Series Switches on page 3059
•
Example: Configuring MPLS on J-EX Series Switches on page 3071
•
Configuring MPLS on Provider Edge Switches (CLI Procedure)
•
Junos OS MPLS Applications Configuration Guide
at
http://www.juniper.net/techpubs/software/junos/
3063
Chapter 120: MPLS—Overview
Содержание PowerConnect J-EX8208
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