Path Option Attributes; Configuration Hierarchy Of Path Option Attributes - 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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Implementing MPLS Traffic Engineering
• When a given intermediate node needs to soft-preempt the existing LSP, it sends a new or special path
• When the ingress router receives the path error (preemption pending) from the intermediate node, it
• When the re-optimization is complete, the ingress router tears down the soft-preempted LSP.
Related Topics
Enabling Soft-Preemption on a Node, on page 239
Enabling Soft-Preemption on a Tunnel, on page 241
Path Option Attributes
The path option attributes are configurable through a template configuration. This template, named attribute-set,
is configured globally in the MPLS traffic-engineering mode.
You can apply an attribute-set to a path option on a per-LSP basis. The path option configuration is extended
to take a path option attribute name. LSPs computed with a particular path option uses the attributes as specified
by the attribute-set under that path option.
These prerequisites are required to implement path option attributes:
• Path option type attribute-set is configured in the MPLS TE mode
• Path option CLI extended to accept an attribute-set name
The signalled-bandwidth and affinity attributes are supported under the attribute-set template.
Note
Related Topics
Configuring Attributes within a Path-Option Attribute, on page 242
Configuration Hierarchy of Path Option Attributes
You can specify a value for an attribute within a path option attribute-set template. This does not prevent
the configuring of the same attribute at a tunnel level. However, it is important to note that only one level is
taken into account. So, the configuration at the LSP level is considered more specific than the one at the level
of the tunnel, and it is used from this point onwards.
Attributes that are not specified within an attribute-set take their values as usual--configuration at the tunnel
level, configuration at the global MPLS level, or default values. Here is an example:
attribute-set path-option MYSET
affinity 0xBEEF mask 0xBEEF
interface tunnel-te 10
affinity 0xCAFE mask 0xCAFE
signalled-bandwidth 1000
path-option 1 dynamic attribute-set name MYSET
path-option 2 dynamic
OL-28381-02
error (preemption pending) to the ingress router. The intermediate node does not dismantle the LSP and
maintains its state.
immediately starts a re-optimization that avoids the link that caused the preemption.
Cisco ASR 9000 Series Aggregation Services Router MPLS Configuration Guide, Release 4.3.x
Path Option Attributes
151
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