Cisco 1604 User Manual
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Cisco IOS Dial Services Quick Configuration Guide
Chapter 3
Configuring the Cisco 1604 Router
Step 6—Testing the Cisco 1604 Connection to the Cisco AS5300
dialer-group 2
isdn switch-type basic-ni
isdn spid1 51255544330101
isdn spid2 51255544340101
no cdp enable
ppp authentication chap pap callin
ppp multilink
hold-queue 75 in
!
ip classless
ip route 0.0.0.0 0.0.0.0 10.1.254.1 permanent
!
dialer-list 2 protocol ip permit
!
line con 0
line vty 0 4
!
end
Tips
•
To see the load currently assigned to the interface, enter the show interface bri 0:1 command.
Search for the output field “load x/255.” Use SNMP to monitor the load on an interface. How you
set the threshold depends on each site’s characteristics, such as traffic patterns and WAN costs. If
you are in an environment where all calls are local, then you can set up the connections full time.
•
Large ISDN phone bills arise due to failure to appropriately tune filters and load thresholds. Filters
are dialer lists, which are applied with dialer groups. The dialer-list command and dialer-group
command control the first B channel. The dialer load-threshold command controls the behavior
when additional B channels are connected.
•
In this case study, the Cisco AS5300 does not dial out to the remote sites. Therefore, do not tune
the central site’s dialer threshold setting. Only the remote side is in charge of opening and closing
channels based on the settings of the dialer commands.
•
Make sure you configured the correct SPID numbers on the BRI interface.
Step 6—Testing the Cisco 1604 Connection to the Cisco AS5300
The test strategy is to ping the Cisco AS5300’s WAN port; then, ping the backbone behind the access
server. Cisco recommends you ping the domain name server (DNS) on the backbone since this device
should always be up and operating.
Pinging a next-hop IP address can have complications in an IP-unnumbered environment. For example,
complications arise when WAN interfaces are configured with unnumbered IPs.
Note
The typical low-level test to verify connectivity in a sync PPP environment is to ping a
device on the other end of the WAN link. In a modem environment (async PPP), the
low-level test is to establish an EXEC shell on the router.