Configuring Flexible Name-Based Tunnel Constraints; Configuring Automatic Bandwidth - Cisco NCS 5500 Series Configuration Manual

Implementing MPLS Traffic Engineering
Related Topics
• Configuring an IETF DS-TE Tunnel Using RDM, on page 45
• Configuring Pre-Standard DS-TE, on page 44
• MPLS-TE Features - Details, on page 51

Configuring Flexible Name-Based Tunnel Constraints

MPLS-TE Flexible Name-based Tunnel Constraints provides a simplified and more flexible means of
configuring link attributes and path affinities to compute paths for the MPLS-TE tunnels.
In traditional TE, links are configured with attribute-flags that are flooded with TE link-state parameters using
Interior Gateway Protocols (IGPs), such as Open Shortest Path First (OSPF).
MPLS-TE Flexible Name-based Tunnel Constraints lets you assign, or map, up to 32 color names for affinity
and attribute-flag attributes instead of 32-bit hexadecimal numbers. After mappings are defined, the attributes
can be referred to by the corresponding color name.
Configuration Example
This example shows assigning a how to associate a tunnel with affinity constraints.
RP/0/RP0/CPU0:router# configure
RP/0/RP0/CPU0:router(config)# mpls traffic-eng
RP/0/RP0/CPU0:router(config-mpls-te)# affinity-map red 1
RP/0/RP0/CPU0:router(config-mpls-te)# interface HundredGigabitEthernet 0/0/0/3
RP/0/RP0/CPU0:router(config-mpls-te-if)# attribute-names red
RP/0/RP0/CPU0:router(config)# interface tunnel-te 2
RP/0/RP0/CPU0:router(config-if)# affinity include red
RP/0/RP0/CPU0:router(config)# commit

Configuring Automatic Bandwidth

Automatic bandwidth allows you to dynamically adjust bandwidth reservation based on measured traffic.
MPLS-TE automatic bandwidth monitors the traffic rate on a tunnel interface and resizes the bandwidth on
the tunnel interface to align it closely with the traffic in the tunnel. MPLS-TE automatic bandwidth is configured
on individual Label Switched Paths (LSPs) at every headend router.
The following table specifies the parameters that can be configured as part of automatic bandwidth
configuration.
Table 3: Automatic Bandwidth Parameters
Bandwidth Parameters
Application frequency
Bandwidth limit
Bandwidth collection frequency
Description
Configures how often the tunnel bandwidths changed
for each tunnel. The default value is 24 hours.
Configures the minimum and maximum automatic
bandwidth to set on a tunnel.
Enables bandwidth collection without adjusting the
automatic bandwidth. The default value is 5 minutes.
MPLS Configuration Guide for Cisco NCS 5500 Series Routers, IOS XR Release 6.2.x
Configuring MPLS-TE
47