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The Virtual Template Interface Service feature provides a generic service that can be used to apply predefined configurations (virtual template interfaces) in dynamically creating and freeing virtual access interfaces as needed.
This feature is supported on all platforms that support Multilink PPP.
For virtual template interface configuration tasks and examples, refer to the "Configuring Virtual Template Interfaces" chapter in the Dial Solutions Configuration Guide.
To tear down the virtual access interface and free the memory for other dial-in uses, use the clear interface virtual-access EXEC command.
clear interface virtual-access number| number | Number used to identify the virtual access interface. |
EXEC
This command first appeared in Cisco IOS Release 11.2 F.
This command does not free the memory for uses unrelated to dial-in access.
The following example clears a specified virtual access interface. You can use the show interfaces virtual-access command to display the interface numbers before you clear any specific one.
clear interface virtual access 1
You can use the master indexes or search online to find documentation of related commands.
interface virtual-template
To create a virtual template interface that can be configured and applied dynamically in creating virtual access interfaces, use the interface virtual-template global configuration command.
interface virtual-template number| number | Number used to identify the virtual template interface. |
Disabled. No virtual template number is defined.
Global configuration
This command first appeared in Cisco IOS Release 11.2 F.
A virtual template interface is used to provide the configuration for dynamically created virtual access interfaces. It is created by users and can be saved in nonvolatile RAM (NVRAM).
Once the virtual template interface is created, it can be configured in the same way as a serial interface.
Virtual template interfaces can be created and applied by various applications such as Virtual Profiles, virtual private dialup networks (VPDN), PPP over ATM, protocol translation, and Multichassis Multilink PPP (MMP).
The following example creates and configures virtual template interface 1:
interface virtual-template 1 ip unnumbered ethernet 0 ppp multilink ppp authentication chap
To display status, traffic data, and configuration information about a specified virtual access interface, use the show interfaces virtual-access EXEC command.
show interfaces virtual-access number [configuration]| number | Number of the virtual access interface. |
| configuration | (Optional) Restricts output to configuration information. |
EXEC
This command first appeared in Cisco IOS Release 11.2 F.
The following is sample output of the show interfaces virtual-access EXEC command.
Router# show interfaces virtual-access 1
Virtual-Access1 is up, line protocol is up
Hardware is Virtual Access interface
Interface is unnumbered. Using address of Ethernet0 (172.21.114.132)
MTU 1500 bytes, BW 64 Kbit, DLY 100000 usec, rely 255/255, load 1/255
Encapsulation PPP, loopback not set, keepalive set (10 sec)
DTR is pulsed for 5 seconds on reset
LCP Open, multilink Closed
Open: IPCP, CDP
Last input 5d04h, output never, output hang never
Last clearing of "show interface" counters 00:06:42
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
76 packets input, 3658 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
141 packets output, 2909 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
Table 117 describes the fields in this output that are most significant to virtual access interfaces.
To display network layer IP information about a specified virtual access interface, use the show ip interface virtual-access EXEC command.
show ip interface virtual-access number| number | Number of the virtual access interface. |
EXEC
This command first appeared in Cisco IOS Release 11.2 F.
The following is output from the show ip interface virtual-access command. This virtual access interface has been configured with a virtual template interface that applies the ip unnumbered ethernet 0 command.
Router# show ip interface virtual-access 1
Virtual-Access1 is up, line protocol is up
Interface is unnumbered. Using address of Ethernet0 (172.21.114.132)
Broadcast address is 255.255.255.255
Peer address is 20.0.0.1
MTU is 1500 bytes
Helper address is not set
Directed broadcast forwarding is enabled
Outgoing access list is not set
Inbound access list is Virtual-Access1#0
Proxy ARP is enabled
Security level is default
Split horizon is enabled
ICMP redirects are always sent
ICMP unreachables are always sent
ICMP mask replies are never sent
IP fast switching is disabled
Table 118 describes only the output fields that are significant to virtual access interfaces and not described in other IP commands.
| Field | Description |
|---|---|
| Virtual-Access1 is up, line protocol is up | Virtual access interface is up and the upper layers consider the line usable. |
| Interface is unnumbered. Using address of Ethernet0 (172.21.114.132) | ip unnumbered ethernet 0 command was included in the virtual template interface cloned on this interface. |
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