Cisco Systems 3-15, Testing the Cisco 1604 Connection to the Cisco AS5300, Tips, dialer-group

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

pppauthentication 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-listcommand and dialer-groupcommand control the first B channel. The dialer load-thresholdcommand 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.

Cisco IOS Dial Services Quick Configuration Guide

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