XPI與XCI

Usage Guidelines

The nas-port-id format c command defines the following broadband subscriber access line identification (NAS-Port-ID) coding format:

{atm/eth/trunk} NAS_slot/NAS_subslot/NAS_port:XPI:XCI {Circuit-ID/Remote-ID/default string}

• For ATM, XPI is the virtual path identifier (VPI) and XCI is the virtual circuit identifier (VCI).

• For Ethernet, XPI is outer vlan-tag, XCI is inner vlan-tag.

• Requirements for XPI:XCI for Ethernet are as follows:

• For 802.1Q tunneling (QinQ), the format should be outer vlan-tag:inner vlan-tag. (Prior to Release 12.2(31)SB2, Cisco IOS software supports inner vlan-tag:outer vlan-tag).

• For single tag VLAN, XPI should be 4096.

• The Circuit-ID tag (if present) must be appended to this string when the nas-port-id format c command is used. The format for the Circuit-ID or Remote-ID tag is as follows:

AccessNodeIdentifier/ANI_rack/ANI_frame/ANI_slot/ANI_subslot/ANI_port[:ANI_XPI.ANI_XCI]

• The digital subscriber line access multiplexer (DSLAM) should append this information to the broadband remote access server (BRAS), and the BRAS transparently delivers it. If the Circuit-ID or Remote-ID tag is not present in DHCP option 82, a string of 0/0/0/0/0/0 should be appended to the NAS-Port-ID tag.

The following examples illustrate this format:

• NAS-Port-ID = atm 31/31/7:255.65535 guangzhou001/0/31/63/31/127

In this example, the subscriber interface type of the BRAS equipment is an ATM interface, the BRAS slot number is 31, the BRAS subslot number is 31, the BRAS port number is 7, the VPI is 255, and the VCI is 65535. The string guangzhou001/0/31/63/31/127 is the Circuit-ID or Remote-ID tag.

• NAS-Port-ID = eth 31/31/7:1234.2345 0/0/0/0/0/0

In this example, the subscriber interface type of the BRAS equipment is an Ethernet interface, the BRAS slot number is 31, the BRAS subslot number is 31, the BRAS port number is 7, the outer vlan-tag is 1234, and the inner vlan-tag is 2345. The string 0/0/0/0/0/0 is the default.

• NAS-Port-ID = eth 31/31/7:4096.2345 0/0/0/0/0/0

In this example, the subscriber interface type of the BRAS equipment is an Ethernet interface, the BRAS slot number is 31, the BRAS subslot number is 31, the BRAS port number is 7, and the VLAN ID is 2345. The string 0/0/0/0/0/0 is the default.

Examples

The following example lists the commands for entering BBA group configuration mode and identifying a profile, configuring a virtual template, and specifying format c for the NAS-Port-ID tag:

Router(config)# bba-group pppoe bba-pppoeoe
Router(config-bba-group)# virtual-template 1
Router(config-bba-group)# nas-port-id format c
!

Related Commands