Specifications

3-37
Cisco AS5x00 Case Study for Basic IP Modem Services
11/24/1999
Section 3 Commissioning the Cisco AS5800 Hardware
Enabling IP Basic Setup
Step 3
Choose a specific modem and inspect the modem-to-TTY line association. TTY lines are simulated
RS-232 ports. In this example, TTY 432 is associated with modem 1/2/00.
TTY line numbers map to specific slots. Each slot is hard coded with 144 TTY lines. In this case study,
the first modem card is in slot 2 (slot 0 and slot 1 do not contain modem cards).
5800-NAS#show modem 1/2/00
Mdm Typ Status Tx/Rx G Duration RTS CTS DCD DTR
--- --- ------ ----- - -------- --- --- --- ---
1/2/00 (n/a) Idle 0/0 1 00:00:00 RTS CTS noDCD DTR
Modem 1/2/00, Cisco MICA modem (Managed), Async1/2/00, TTY432
Firmware Rev: 2.6.2.0
Modem config: Incoming and Outgoing
Protocol: (n/a), Compression: (n/a)
Management config: Status polling
RX signals: 0 dBm
Last clearing of "show modem" counters never
0 incoming completes, 0 incoming failures
0 outgoing completes, 0 outgoing failures
0 failed dial attempts, 0 ring no answers, 0 busied outs
0 no dial tones, 0 dial timeouts, 0 watchdog timeouts
0 no carriers, 0 link failures, 0 resets, 0 recover oob
0 recover modem, 0 current fail count
0 protocol timeouts, 0 protocol errors, 0 lost events
. . .
Snip
Task 6. Enabling IP Basic Setup
Tune IP routing behavior and domain-name services for EXEC shell users:
Step 1
Optimize IP routing functions. Enter the following commands in global configuration mode:
ip subnet-zero
no ip source-route
ip classless
Table 3-9 describes the previous commands:
Table 3-9 IP Routing Commands
Command Purpose
ip subnet-zero
Specifies that 172.22.0.0 is a valid subnet.
no ip source-route
Tightens security by ensuring that IP-header packets
cannot define their own paths through the access server.
ip classless
Turns off traditional IP network class distinctions in the
router [Class-A, Class-B, Class-C].