Vp Tunneling - 3Com CoreBuilder 7000 Operation Manual

VP Tunneling

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Table 24 Comparison of SVC and PVC
SVC
Demand connections
Not automatically re-established
after network failure
Remain active for arbitrary amount
of time in the LANE environment
Supported by signaling standard
As mentioned previously, a virtual path (VP) is a set of virtual channels
with a common VPI value. A VP tunnel (virtual path tunnel) is a virtual
path which has been extended to include a signaling channel and an ILMI
channel, in addition to the call channels. Normally, this is accomplished by
assigning VCIs to a common VPI. The VPI values are allocated in the range
0 through 7; for each VPI value, the VCIs are allocated according to
Table 25.
:
Table 25 Allocation of VCIs in VP Tunnel
Channel VCI
Signaling 5
ILMI 16
Calls 32-511
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In the CoreBuilder 7000HD, you set up VP tunnels within a port. Instead
of a standard port which has one signaling channel (VPI/VCI=0/5) and
one ILMI channel (VPI/VCI=0/16), you can set up eight VP tunnels in a
single port, corresponding to the eight possible VP values.
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Table 26 VP Tunnels in a Port
VP Tunnel VPI value
1 0
2 1
3 2
4 3
5 4
6 5
PVC
Permanent connections
Automatically re-established after
network failure
Remain active for long periods of
time
Supported by MIB or other
management entity
Signaling ILMI
0/5 0/16
1/5 1/16
2/5 2/16
3/5 3/16
4/5 4/16
5/5 5/16
VP Tunneling 101
Calls
0/32:0/511
1/32:1/511
2/32:2/511
3/32:3/511
4/32:4/511
5/32:5/511