H3C Technologies H3C Intelligent Management Center User Manual
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decision. Both setup and hold priorities range from 0 to 7, with a lower numerical number
indicating a higher priority.
For a new path to preempt an existing path, the setup priority of the new path must be greater
than the hold priority of the existing path. To initiate preemption, the Resv message of RSVP-TE
is sent.
To avoid flapping caused by improper preemptions between CR-LSPs, the setup priority of a
CR-LSP should not be set higher than its hold priority.
Reservation Style—Each LSP set up using RSVP-TE is assigned a resource reservation style.
During an RSVP session, the receiver decides which reservation style can be used for this
session and which LSPs can be used.
Two reservation styles are available:
•
Fixed-filter style (FF)—Where resources are reserved for individual senders and cannot
be shared among senders on the same session.
•
Shared-explicit style (SE)—Where resources are reserved for senders on the same session
and shared among them.
b.
Click Next.
You are directed to the Configure Path Policy page, as shown in
Figure 51 Configure Path Policy page
a.
Configure the parameters as needed.
Affinity (0–FFFFFFFF) and Affinity Mask (0–FFFFFFFF):
The affinity attribute of an MPLS TE tunnel identifies the properties of the links that the tunnel can
use. Together with the link administrative group, it decides which links the MPLS TE tunnel can
use. This is done by ANDing the 32-bit affinity attribute with the 32-bit link administrative
group attribute. When doing that, a 32-bit mask is used. The affinity bits corresponding to the
1s in the mask are “do care” bits which must be considered while those corresponding to the
0s in the mask are “don’t care” bits.
For a link to be used by a TE tunnel, at least one considered affinity bit and its corresponding
administrative group bit must be set to 1.
Suppose the affinity of an MPLS TE tunnel is 0xFFFFFFFF and the mask is 0x0000FFFF. For a
link to be used by the tunnel, the leftmost 16 bits of its administrative group attribute can be 0s
or 1s, but at least one of the rest bits must be 1.
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