HP 12500 Series Configuration Manual page 13
Mpls, routing switch series
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Also See for 12500 Series:
- Configuration manual (338 pages) ,
- Network management and monitoring command reference (320 pages) ,
- Command reference manual (157 pages)
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Figure 5
shows the two label advertisement modes, DU and DoD.
In DU mode, an LSR assigns a label to a FEC and then distributes the FEC-label binding to its
upstream LSR unsolicitedly.
In DoD mode, an LSR assigns a label to a FEC and distributes the FEC-label binding to its
upstream LSR only when it receives a label request from the upstream LSR.
NOTE:
•
The switch supports only the DU mode.
An upstream LSR and its downstream LSR must use the same label advertisement mode; otherwise, no
•
LSP can be established.
Label distribution control modes
•
Label distribution control modes include independent and ordered.
In independent mode, an LSR can distribute label bindings upstream at anytime. This means
that an LSR may have distributed a label binding for a FEC to its upstream LSR before it receives
a binding for that FEC from its downstream LSR. As shown in
distribution control mode, if the label advertisement mode is DU, an LSR will assign labels to its
upstream even if it has not obtained labels from its downstream; if the label advertisement
mode is DoD, the LSR distributes a label to its upstream as long as it receives a label request
from the upstream.
Figure 6 Independent label distribution control mode
1) Distribute a label to the
DU mode
Ingress
1) Request the downstream to
2) Assign and distribute a
label to the upstream upon
DoD mode
In ordered mode, an LSR distributes its label binding for a FEC upstream only when it receives
a label binding for the FEC from its downstream or it is the egress of the FEC. In
distribution control is in ordered mode. In this case, if the label advertisement mode is DU, an
LSR will distribute a label upstream only when it receives a label binding for the FEC from its
downstream; if the label advertisement mode is DoD, after an LSR (Transit in this example)
receives a label request from its upstream (Ingress), the LSR (Transit) sends a label request to its
downstream (Egress). Then, after the LSR (Transit) receives the label binding from its
downstream (Egress), it distributes a label binding to the upstream (Ingress).
Label retention modes
•
upstream unsolicitedly
Transit
assign a label
receiving the request
2) Distribute a label to the
upstream unsolicitedly
3) Request the downstream to
assign a label
4) Assign and distribute a
label to the upstream upon
receiving the request
5
Figure
6, in independent label
Egress
Figure
5, label
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