Cisco Systems IGX 8400 Manual De Usuario
Trunk Cards 4-13
Universal Switching Module Enhanced
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8.3 and 9.3
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9.4 and the public network
Step 2
Configure trunk 8.1, 8.2, and 8.3 to use VPC 101, 102, and 103, respectively.
Step 3
Add 3 VPC connections from 9.1, 9.2, and 9.3 to 9.4. At the far end, use the same VPCs.
Routing over Cell Trunks Only
You can specify trunk cell routing only as an option when you add a connection between UXM-E,
ASI, or BXM ports. When you enable trunk cell routing, switch software routes across only the
cell-based trunk cards BNI, BXM, and UXM-E: no conversion to FastPackets occurs on the route.
If you disable trunk cell routing, the routing process can select a FastPacket-based trunk and so
decrement the number of available gateway connections. Also, using a FastPacket-based trunk may
result in increased network delays. Therefore, enabling trunk cell routing is the preferred choice
when you add a connection at a BNI, BXM, or UXM-E.
ASI, or BXM ports. When you enable trunk cell routing, switch software routes across only the
cell-based trunk cards BNI, BXM, and UXM-E: no conversion to FastPackets occurs on the route.
If you disable trunk cell routing, the routing process can select a FastPacket-based trunk and so
decrement the number of available gateway connections. Also, using a FastPacket-based trunk may
result in increased network delays. Therefore, enabling trunk cell routing is the preferred choice
when you add a connection at a BNI, BXM, or UXM-E.
If you add connections at other port cards, such as a UFM or ALM/A, switch software does not
display the trunk cell routing option.
display the trunk cell routing option.
On the CLI, the addcon prompt for this option appears as “trunk cell routing restrict y/n?” It appears
after you enter either the ATM class of service or after you finish specifying all the individual
bandwidth parameters that apply to the current connection type. You can specify whether the default
for trunk cell routing is “Yes” or “No” through the cnfnodeparm (superuser) command.
after you enter either the ATM class of service or after you finish specifying all the individual
bandwidth parameters that apply to the current connection type. You can specify whether the default
for trunk cell routing is “Yes” or “No” through the cnfnodeparm (superuser) command.
The UXM-E in Trunk Mode
The UXM-E trunk can communicate ATM cells that originated at an ATM endpoint or—through its
on-board gateway functionality—FastPacket-based traffic such as voice, data, and Frame Relay. A
UXM-E trunk can connect to the following trunk cards:
on-board gateway functionality—FastPacket-based traffic such as voice, data, and Frame Relay. A
UXM-E trunk can connect to the following trunk cards:
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UXM-E
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BXM
Types of Supported Traffic
As previously stated, the UXM-E trunk can connect to only another UXM-E trunk or a BXM trunk.
On the other hand, the types of traffic that traverse a UXM-E trunk can originate at ATM ports or
other types of ports. The types of traffic that a cell on a UXM-E trunk can carry appear in Table 4-7.
Table 4-7 shows the traffic types that ATM cells can carry where the payload originated as a
FastPacket.
On the other hand, the types of traffic that traverse a UXM-E trunk can originate at ATM ports or
other types of ports. The types of traffic that a cell on a UXM-E trunk can carry appear in Table 4-7.
Table 4-7 shows the traffic types that ATM cells can carry where the payload originated as a
FastPacket.
Table 4-7
Traffic from FastPacket-Based Cards
Traffic Type
Timestamped
Non-timestamped
Voice
Bursty data A
Bursty data B
High priority
CBR, VBR, ABR