Hybrid Node
A GMPLS Hybrid Node is a node with different Interface Switching Capabilities on one or more of its interfaces. For these interfaces it advertises this link with multiple
ISCDs with different
ISC values.
Figure 5a shows an example hybrid node. The hybrid node has two switching elements (matrices), which support, for instance, TDM and PSC switching respectively. The node terminates a PSC and a TDM link (
Link1 and
Link2 respectively). It also has an internal link connecting the two swtching elements.
The two switching elements are internally interconnected in such a way that it is possible to terminate some of the resources of, say,
Link2 and provide adaptation for PSC traffic received/sent over the PSC interface (#b). This situation is modeled in GMPLS by connecting the local end of
Link2 to the TDM switching element via an additional interface realizing the termination/adaptation function. Two ways are possible to set up PSC LSPs. Available resource advertisement e.g. Unreserved and Min/Max LSP Bandwidth should cover both two ways.
Network element
.............................
: -------- :
: | PSC | :
Link1 -------------<->--|#a | :
: +--<->---|#b | :
: | -------- :
TDM : | ---------- :
+PSC : +--<->--|#c TDM | :
Link2 ------------<->--|#d | :
: ---------- :
:............................
Figure 5a. Hybrid node.
TE link advertisements issued by Hybrid Nodes must also provide information about the internal
adaptation capabilities.
Typically
Forwarding Adjacency LSPs will be setup across the TDM layer to be able to form an PSC link.
Categories
See also:
Simplex Node
CategoryGMPLS
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