Configure Mpls-Te And Fast-Reroute On Ospf: Example; Configure The Ignore Is-Is Overload Bit Setting In Mpls-Te: Example - Cisco ASR 9000 Series Configuration Manual
Aggregation services router mpls
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- Command reference manual (1138 pages) ,
- Routing configuration manual (702 pages) ,
- Reference manual (696 pages)
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Configure MPLS-TE and Fast-Reroute on OSPF: Example
Configure MPLS-TE and Fast-Reroute on OSPF: Example
CSPF areas are configured on a per-path-option basis. The following example shows how to use the
traffic-engineering tunnels (tunnel-te) interface and the active path for the MPLS-TE tunnel:
configure
interface tunnel-te 0
Configure the Ignore IS-IS Overload Bit Setting in MPLS-TE: Example
This example shows how to configure the IS-IS overload bit setting in MPLS-TE:
This figure illustrates the IS-IS overload bit scenario:
Figure 19: IS-IS overload bit
Consider a MPLS TE topology in which usage of nodes that indicated an overload situation was restricted.
In this topology, the router R7 exhibits overload situation and hence this node can not be used during TE
CSPF. To overcome this limitation, the IS-IS overload bit avoidance (OLA) feature was introduced. This
feature allows network administrators to prevent RSVP-TE label switched paths (LSPs) from being disabled
when a router in that path has its Intermediate System-to-Intermediate System (IS-IS) overload bit set.
The IS-IS overload bit avoidance feature is activated at router R1 using this command:
mpls traffic-eng path-selection ignore overload
configure
mpls traffic-eng
Related Topics
Configuring the Ignore Integrated IS-IS Overload Bit Setting in MPLS-TE, on page 182
Cisco ASR 9000 Series Aggregation Services Router MPLS Configuration Guide, Release 4.3.x
254
path-option 1 explicit id 6 ospf 126 area 0
path-option 2 explicit name 234 ospf 3 area 7 verbatim
path-option 3 dynamic isis mtbf level 1 lockdown
commit
path-selection ignore overload
commit
Implementing MPLS Traffic Engineering
OL-28381-02
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