H3C Technologies H3C S6800 Series Switches - Manual (Page 83)

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Establishing an MPLS TE tunnel by using RSVP-TE
Before you configure this task, you must use the rsvp command and the rsvp enable command to enable
RSVP on all nodes and interfaces that the MPLS TE tunnel traverses.
Perform this task on the ingress node of the MPLS TE tunnel.
To configure RSVP-TE to establish an MPLS TE tunnel:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter MPLS TE tunnel interface
view. interface tunnel tunnel-number
[ mode mpls-te ]
N/A
3. Configure MPLS TE to use
RSVP-TE to establish the
tunnel.
mpls te signaling rsvp-te
By default, MPLS TE uses RSVP-TE
to establish a tunnel.
4. Specify an explicit path for the
MPLS TE tunnel, and specify
the path preference value.
mpls te path preference value
{ dynamic | explicit-path
path-name } [ no-cspf ] By default, MPLS TE uses the
calculated path to establish a
CRLSP.
Controlling CRLSP path selection
Before performing the configuration tasks in this section, be aware of each configuration objective and
its impact on your device.
MPLS TE uses CSPF to calculate a path according to the TEDB and constraints and sets up the CRLSP
through RSVP-TE. MPLS TE provides measures that affect the CSPF calculation. You can use these
measures to tune the path selection for CRLSP.
Configuring the metric type for path selection
Each MPLS TE link has two metrics: IGP metric and TE metric. By planning the two metrics, you can select
different tunnels for different classes of traffic. For example, use the IGP metric to represent a link delay
(a smaller IGP metric value indicates a lower link delay), and use the TE metric to represent a link
bandwidth value (a smaller TE metric value indicates a bigger link bandwidth value).
You can establish two MPLS TE tunnels: Tunnel 1 for voice traffic and Tunnel 2 for video traffic. Configure
Tunnel 1 to use IGP metrics for path selection, and configure Tunnel 2 to use TE metrics for path selection.
As a result, the video service (with larger traffic) travels through the path that has larger bandwidth, and
the voice traffic travels through the path that has lower delay.
To configure the metric type for tunnel path selection:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter MPLS TE view. mpls te N/A
3. Specify the metric type to use
when no metric type is
explicitly configured for a
tunnel.
path-metric-type { igp | te }
By default, a tunnel uses the TE
metric for path selection.
Execute this command on the
ingress node of an MPLS TE tunnel.