H3C Technologies H3C Intelligent Management Center - Manual (Page 184)

The affinity of an MPLS TE tunnel is configured at the first node on the tunnel, and then signaled
to the rest nodes through CR-LDP or RSVP-TE.
NOTE:
The associations between administrative groups and affinities may vary by vendor. To ensure the
successful establishment of a tunnel between two devices of different vendors, correctly configure their
respective administrative groups and affinities according to their configuration guides.
b. If you want the tunnel to refer to an explicit path that you have configured, click Select next to
Explicit Path, enter part or the entire name of the explicit path, and then click Query. Explicit
paths matching this description appear in the Explicit Path Query List section of the page.
Select the explicit path you want, and then click OK.
c. Click Next. You are directed to the Configure Advanced Attributes page where you can see the
following parameters:
Metric Type—Specify the metric type to use when no metric type is explicitly configured for a
tunnel. You can select TE or IGP. TE metrics of links are used by default.
When Multiprotocol Label Switching TE is configured in a network, the IGP floods two metrics
for every link: normal IGP (OSPF or IS-IS) link metric and TE link metric.
The IGP uses the IGP link metric in the normal way to compute routes for destination networks,
and MPLS TE used the TE link metric to calculate and verify paths for TE tunnels. You can
specify the path calculation for a given tunnel based on either of these metrics.
You can configure the TE link metrics so that they represent the needs of a particular
application, for example, the TE link metrics can be configured to represent link transmission
delay.
When TE tunnels are used to carry two types of traffic, you can tailor tunnel path selection to
the requirements of each type of traffic. For example, suppose certain tunnels are to carry voice
traffic (which requires low delay) and other tunnels are to carry data. You can use the TE link
metric to represent link delay and do the following:
• Configure tunnels that carry voice to use the TE link metric set to represent link delay for
path calculation.
• Configure tunnels that carry data to use the IGP metric for path calculation.
Unless explicitly configured, the TE link metric for a given link is the IGP link metric. When the
TE link metric is used to represent a link property that is different from cost/distance, you must
configure every network link that can be used for TE tunnels with a TE link metric that represents
that property. Failure to do so might cause tunnels to use unexpected paths.
Forwarding Type—You can select the traffic flow type of the tunnel. It limits the usage of the
tunnel. Values include ACL, VPN Instance and No Limit.
Loop Check—You can check if a loop exists.
Tunnel Rebuild Times—You can configure the system to attempt setting up a tunnel multiple
times until it is established successfully or until the number of attempts reaches the upper limit.
The valid range is from 10 to 4294967295.
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