Command:

x25 pvc

Mode:

Router(config-if)#


Syntax:

x25 pvc circuit protocol address [protocol2 address2[...[protocol9 address9]]] x121-address
[option]

no x25 pvc circuit


Syntax Description:

circuit

Virtual-circuit channel number, which must be less than the virtual circuits assigned to the switched virtual circuits (SVCs).

protocol

Protocol type, entered by keyword. Supported protocols are listed in the Table below. As many as nine protocol and address pairs can be specified in one command line.

address

Protocol address of the host at the other end of the PVC.

x121-address

X.121 address.

option

(Optional) Provides additional functionality or allows X.25 parameters to be specified for the PVC. Can be any of the options listed in Table.


Command Description:

To establish an encapsulation permanent
virtual circuit (PVC), use the encapsulating version of the x25 pvc interface
configuration command. To delete the PVC, use the no form of this command
with the appropriate channel number.

PVCs are not supported for ISO CMNS.

You no longer need to specify a datagram protocol-to-address mapping before
you can set up a PVC; a map is implied from the PVC configuration.
Configurations generated by the router will no longer specify a map for
encapsulating PVCs.

When configuring a PVC to carry CLNS traffic, use the X.121 address as the
subnetwork point of attachment (SNPA) to associate the PVC with a CLNS neighbor
configuration. When configuring a PVC to carry transparent bridge traffic, the
X.121 address is required to identify the remote host to the bridging function.
Other encapsulation PVCs do not require an X.121 address.

Table lists supported protocols.

Table: Protocols Supported by X.25 PVCs

Keyword Protocol

apollo

Apollo Domain

appletalk

AppleTalk

bridge

Bridging1

clns

OSI Connectionless Network Service

compressedtcp

TCP/IP header compression

decnet

DECnet

ip

IP

ipx

Novell IPX

qllc

SNA encapsulation in X.252

vines

Banyan VINES

xns

XNS

1Bridging traffic is supported only for Cisco's traditional encapsulation method, so a bridge PVC cannot specify other protocols.
2QLLC is not available for multiprotocol encapsulation.

Table below lists supported X.25 PVC options.

Table: x25 pvc Options

Option Description

broadcast

Causes the Cisco IOS software to direct any broadcasts sent through this interface to this PVC. This option also simplifies the configuration of OSPF.

method {cisco | ietf | snap | multi}

Specifies the encapsulation method. The choices are as follows:

  •  

  • cisco�Single protocol encapsulation; not available if more than one protocol is carried.
  • ietf�Default RFC 1356 operation; single-protocol encapsulation unless more than one protocol is carried, and protocol identification when more than one protocol is carried.
  • snap�RFC 1356 operation where IP is identified when more than one protocol is carried using the SNAP encoding.
  • multi�Multiprotocol encapsulation used on the PVC.

     

packetsize in-size out-size

Maximum input packet size (in-size) and output packet size (out-size) for the PVC. Both values are typically the same and must be one of the following values: 16, 32, 64, 128, 256, 512, 1024, 2048, or 4096.

passive

Specifies that transmitted TCP datagrams will be compressed only if they were received compressed. This option is available only for PVCs carrying compressed TCP/IP header traffic.

windowsize in-size out-size

Packet count for input window (in-size) and output window (out-size) for the PVC. Both values are typically the same, must be in the range 1 to 127, and must be less than the value set for the x25 modulo command.


Example:

The following example establishes a PVC on channel 2 to encapsulate VINES and IP with the far host:

Router(config)#interface serial 0
Router(config-if)#x25 ltc 5
Router(config-if)#x25 pvc 2 vines 60002A2D:0001 ip 172.20.170.91 11110001

Misconceptions:
None

Related commands:
x25 map

� Cisco Systems, Inc. 2001, 2002, 2003
World Wide Education

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