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ATM Switch Router Software Configuration Guide
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Chapter7 Configuring Virtual Connections
Configuring VP Tunnels
Even though the shaped VP tunnel is defined as CBR, it can carry VCs of another service category
by substituting the new service category after the tunnel interface has been initially configured. For
configuration information, see Chapter9 , “Configuring Resource Management.”
Shaped VP tunnels do not support merged VCs for tag switching.
UBR+ and ABR VCs with non-zero MCR are not allowed on a shaped VPtunnel interface.
The maximum VCs that can transit a shaped VPtunnel interface are determined by the following
chassis configuration:
Catalyst 8540 with redundant route processors, a maximum of 125 VCs
Catalyst 8540 with no redundant route processor, a maximum of 128 VCs
Catalyst 8510, a maximum of 128 VCs
Shaped VP tunnels support interface overbooking. For con figuration information, see the Chapter 9,
“Configuring Resource Management.”
Shaped VP tunnels cannot be configured with ATM router modules because CBR scheduling is not
supported on those interfaces.
Configuring a Shaped VP Tunnel on an Interface
To configure a shaped VPt unnel, perform the following steps, beginning in global configuration mode:
Note The rx-cttr and tx-cttr row indexes must be configured before they are used.
Example
The following example shows how to configure a shaped VP tunnel with a VPI of 99 as
ATMinterface 0/0/0.99
Switch(config)# interface atm 0/0/0
Switch(config-if)# atm pvp 99 shaped rx-cttr 100 tx-cttr 100
Switch(config-if)# exit
Switch(config-if)# interface atm 0/0/0.99
Switch(config-subif)#
Command Purpose
Step1 Switch(config)# atm
connection-traffic-table-row [index row-index]
cbr pcr rate
Configures the connection-traffic-table row for
the desired PVP CBR cell rate.
Step2 Switch(config)# interface atm card/subcard/port
Switch(config-if)#
Selects the physical interface to configure.
Step3 Switch(config-if)# atm pvp vpi shaped rx-cttr
index tx-cttr index
Configures an interface PVP leg.
Step4 Switch(config-if)# exit
Switch(config)#
Exits interface configuration mode.
Step5 Switch(config)# interface atm
card/subcard/port.vpt#
Switch(config-subif)#
Creates a shaped VPtunnel using a VP tunnel
number that matches the PVP leg VPI.