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ATM Switch Router Software Configuration Guide
OL-7396-01
Chapter 7 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 Chapter 9, “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 VP tunnel interface.
• The maximum VCs that can transit a shaped VP tunnel 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 configuration 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 VP tunnel, 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
ATM interface 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
Step 1
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.
Step 2
Switch(config)# interface atm card/subcard/port
Switch(config-if)#
Selects the physical interface to configure.
Step 3
Switch(config-if)# atm pvp vpi shaped rx-cttr
index tx-cttr index
Configures an interface PVP leg.
Step 4
Switch(config-if)# exit
Switch(config)#
Exits interface configuration mode.
Step 5
Switch(config)# interface atm
card/subcard/port.vpt#
Switch(config-subif)#
Creates a shaped VP tunnel using a VP tunnel
number that matches the PVP leg VPI.