Rsvp Control Plane Extensions; Igp Extensions - Alcatel-Lucent 7450 Manual

Because of the encroaching of CT0 into CT1, we would need to deduct the overlapping
reservation. This would then yield:
Unreserved (CT1, 0) = BC0 – Reserved (CT0, 0) – Reserved (CT1, 0) = 200 – 120 - 50 = 30
Mbps,
which is the correct figure.
Extending the formula with both equations:
Unreserved (CT1, 0) = Min [BC1 – Reserved (CT1, 0), BC0 – Reserved (CT0, 0) – Reserved
(CT1, 0)] = Min [100 – 50, 200 – 120 – 50] = 30 Mbps
Note that an outer doll can encroach into inner doll reducing the bandwidth available for inner
dolls.

RSVP Control Plane Extensions

RSVP will use the Class Type object to carry LSP class-type information during path setup. Eight
values will be supported for class-types 0 through 7 as per RFC 4124. Class type 0 is the default
class which is supported today on the router.
One or more forwarding classes will map to a Diff-Serv class type trough a system level
configuration.

IGP Extensions

IGP extensions are defined in RFC 4124. Diff-Serv TE advertises link available bandwidth,
referred to as unreserved bandwidth, by OSPF TE or IS-IS TE on a per TE class basis. A TE class
is a combination of a class type and an LSP priority. In order to reduce the amount of per TE class
flooding required in the network, the number of TE classes is set to eight. This means that eight
class types can be supported with a single priority or four class types with two priorities, etc. In
that case, the operator configures the desired class type on the LSP such that RSVP-TE can signal
it in the class-type object in the path message.
IGP will continue to advertise the existing Maximum Reservable Link Bandwidth TE parameter to
mean the maximum bandwidth that can be booked on a given interface by all classes. The value
advertised is adjusted with the link subscription factor.
7450 ESS MPLS Guide
MPLS and RSVP
Page 113