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CCIE Security Practice Labs by Fahim Hussain Yusuf Bhaiji

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Section 3.0: ISDN Configuration

3.1. Basic ISDN

  1. Configure ISDN as indicated.

  2. Advertise in OSPF Area0.

  3. Configure OSPF demand-circuit to bring up the ISDN if there is a change in the database. See Example 3-18 for ISDN working when switch1 port 2 was disabled for R1 in VLAN-12.

  4. Example 3-18 also shows that OSPF converges when ISDN comes up and all routes are learned via BRI.

3.2. PPP Multilink

  1. Configure PPP multilink and load threshold. See Example 3-18, where both B channels are up.

Example 3-18. ISDN with OSPF Demand-Circuit and PPP Multilink
r1#show dialer BRI0/0 - dialer type = ISDN Dial String Successes Failures Last DNIS Last status 99047132 7 0 00:00:14 successful 0 incoming call(s) have been screened. 0 incoming call(s) rejected for callback. ...

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