Cisco OL-5490-01 Especificaciones descargar pdf (Pagina 43)

2-23

Cisco AS5x00 Case Study for Basic IP Modem Services

11/24/1999

Section 2 Commissioning the Cisco AS5300 Hardware

Configuring the Serial Interfaces

interface Serial3:23

isdn incoming-voice modem

Different versions of Cisco IOS enables different default commands. Release 12.0(5)T enables the

commands in Table 2-8.

Step 2

Verify that ISDN is functioning properly, and the serial channels are up:



Check the ISDN status. Confirm that Layer 1 reports ACTIVE, and the display field

MULTIPLE_FRAME_ESTABLISHED appears at Layer 2. For PRI lines, the terminal endpoint

identifier (TEI) is always 0. The Layer 3 status reports no active calls.

5300-NAS#show isdn status

Global ISDN Switchtype = primary-5ess

ISDN Serial0:23 interface

dsl 0, interface ISDN Switchtype = primary-5ess

Layer 1 Status:

ACTIVE

Layer 2 Status:

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

Layer 3 Status:

0 Active Layer 3 Call(s)

Activated dsl 0 CCBs = 0

The Free Channel Mask: 0x807FFFFF

. . .

Snip



Verify that PRI is working between the remote switch and the Cisco AS5300. After you enter the

debug isdn q921

command, you should see a SAPI message transmitted and received every

10 seconds. A SAPI message indicates that Layer 2 is functioning properly, and there are no

apparent cable problems.

5300-NAS#debug isdn q921

ISDN Q921 packets debugging is on

5300-NAS#

Sep 23 04:19:07.887: ISDN Se0:23: TX -> RRp sapi = 0 tei = 0 nr = 23

Sep 23 04:19:07.891: ISDN Se0:23: RX <- RRf sapi = 0 tei = 0 nr = 23

5300-NAS#undebug isdn q921

ISDN Q921 packets debugging is off

Table 2-8 Release 12.0(5)T Default Commands

Command Purpose

no ip directed-broadcast

Enhances security by preventing broadcasts to this subnet

from unauthorized sources.

isdn switch-type primary-5ess

The ISDN global switch type value is propagated to the

serial-interface level. This happens during initial

configuration or a reload.

Per interface switch-types are first introduced in Release

11.3AA.

no cdp enable

Turns off the cisco discovery protocol (cdp). Otherwise,

the protocol attempts to be negotiated on the PPP links.

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