Cisco BPX 8650, Installation And Configuration Manual

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24-5
Cisco BPX 8600 Series Installation and Configuration
Release 9.3.30, Part Number 78-12907-01 Rev. E0, May 2005
Chapter 24 Configuring BXM Virtual Trunks
How Virtual Trunking Works
On a 1-port BXM-622 card, for example, up to 31 virtual interfaces can be used on the port
corresponding to 31 virtual trunks. On an 8-port BXM 155 card, for example, the 31 VIs are distributed
to the active trunks, standard, or virtual. If trunks were activated on all eight ports, the maximum number
of VIs that can be assigned to one port is 24.(31 less 1 for each of the other 7 trunks activated on the
card).
Figure 24-3 BXM Egress VIrtual Interfaces and Qbins
Automatic Routing Management connections use Qbins 0 through 9.
Virtual Switch Interfaces (VSIs), which support master controllers use Qbins 10 through 15, as
applicable. The BXM can concurrently support MPLS and Automatic Routing Management, or PNNI
and Automatic Routing Management, or MPLS and PNNI at the same time on a given VSI.
Virtual Trunks Across a Public ATM Cloud
An example of a number of virtual trunks configured across a Public ATM Network is shown in
Figure 24-4. There are three virtual trunks shown across the network, each with its own unique VPC.
The three virtual trunks shown in the network are:
•
between BPX_A 4.3.1 and IGX 10.2.1.
•
between BPX_A 4.3.2 and BPX_B 5.1.1.
•
between BPX_B 5.1.2 and IGX_A 10.2.3.
Each VPC defines a virtual trunk that supports the traffic types are described in Table 24-2.
1
16
qbins
Port 1
Port 2
Port 3
Port 4
17
719
Trunk 4.2
BXM
Slot 4
Virtual trunk 4.1.1
Virtual trunk 4.1.2
Virtual trunk 4.1.3
Port 5
Port 6
Port 7
Port 8
1
16
qbins
1
16
qbins
1
16
qbins
1
16
qbins
VI_1
VI_2
VI_3
VI_4
VI_31