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3-11

Cisco IOS Dial Services Quick Configuration Guide

Chapter 3 Configuring the Cisco 1604 Router

Verifying BRI Configuration

Step 1 Enter the no shutdown command. The following output messages appear:

robo-austin(config-if)# no shutdown

robo-austin#

00:45:01: %LINK-3-UPDOWN: Interface BRI0:1, changed state to down

00:45:01: %LINK-3-UPDOWN: Interface BRI0:2, changed state to down

00:45:01: %LINK-3-UPDOWN: Interface BRI0, changed state to up

robo-austin#

00:45:02: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0, TEI 100 changed to up

00:45:02: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0, TEI 101 changed to up

robo-austin(config-if)#

This example shows the BRI0:1 and BRI0:2 states change to “down” because the previous state was

“administratively down.” The BRI0 D channel changes to “up” as it spoofs for the two B channels. After

the D channel finds the B channels, the B channels change state to “up.” The Cisco 1604 communicates

with the telephone switch and receives its TEI numbers for its two B channels.

Step 2 Enter the show isdn status command to check the Cisco 1604’s ISDN status:

robo-austin# show isdn status

Global ISDN Switchtype = basic-ni

ISDN BRI0 interface

dsl 0, interface ISDN Switchtype = basic-ni

Layer 1 Status:

ACTIVE

Layer 2 Status:

TEI = 100, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED

TEI = 101, Ces = 2, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED

Spid Status:

TEI 100, ces = 1, state = 5(init)

spid1 configured, no LDN, spid1 sent, spid1 valid

Endpoint ID Info: epsf = 0, usid = 2, tid = 1

TEI 101, ces = 2, state = 5(init)

spid2 configured, no LDN, spid2 sent, spid2 valid

Endpoint ID Info: epsf = 0, usid = 4, tid = 1

Layer 3 Status:

0 Active Layer 3 Call(s)

Activated dsl 0 CCBs = 0

Total Allocated ISDN CCBs = 0

The fields in the output example resulting from Step 2 above are described in Table 3-2:

Table 3-2 Field Descriptions for the show isdn status Command Output

Field Description

BRI0

Basic Rate Interface. The BRI 0 interface corresponds to DSL-0, which has three channels (2B +D).

DSL

Digital Subscriber Line.

TEI

Terminal Equipment Identifier.

CCB

Call Control Block.

LDN

Local Directory Number.

SPID

Service Profile Identifier.

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