H3C Technologies H3C Intelligent Management Center - Manual (Page 191)

a link that does not have the requested resources (like bandwidth) is not chosen to be a part of
the LSP tunnel or TE tunnel.
b. Assign a metric value, either absolute or relative, to TE tunnels for the purpose of path
calculation. If it is absolute (or fixed), the metric is directly used for path calculation. If it is
relative (or floating), the cost of the corresponding IGP path must be added to the metric before
it can be used for path calculation.
An absolute metric indicates that there is no relationship to the underlying IGP cost. A relative
metric is added to or subtracted from the underlying IGP shortest path cost. If you use a relative
metric, the actual assigned metric value of routes is based on the IGP metric. This relative
metric can be positive or negative, and is bounded by minimum and maximum allowed metric
values.
For example, if you specify a relative metric of -2 for an MPLS TE tunnel, OSPF treats this tunnel
as having a metric of 2 less than the shortest path metric it has calculated. The tunnel is
therefore preferred over other paths to prefixes beyond the tunnel endpoint. If you specify an
absolute metric of 25, and configure OSPF to enable the consideration of SPF best paths,
OSPF considers this metric in its SPF calculations for traffic to the tunnel endpoint as well as
beyond the endpoint. Traffic is routed via this tunnel only if the other calculated paths have
higher metrics.
c. Click Complete. The traffic access is added successfully and appears in the Access Traffic List
section of the page.
Managing traffic access
You can query, add and delete traffic access configuration. Through the traffic access configuration, you
can distribute traffic to a specified tunnel.
To query for traffic access:
1. Click Service > MPLS TE Manager > Traffic Access Mng from the tabular navigation system on the
top of the IMC main page.
2. In the Traffic Access Query section of the page, select the query type and enter the query value.
3. Click Query.
To delete traffic access configuration:
1. Click Service > MPLS TE Manager > Traffic Access Mng from the tabular navigation system on the
top of the IMC main page.
2. In the Access Traffic List section of the page, select the traffic access record you want to delete, and
then click Delete.
3. Click OK.
Protection management
You can use the protection management function to avoid an invalid link or node, in order to avoid data
loss and service interruption. You can perform protection configuration to protect a link or node, so that
181