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Sunday, 18 May 2008 14:02

Router - Cisco Router

Enconding / Framing

            Encoding       Framing
T1        B8ZS + AMI     SF +ESF
E1        HDB3              CRC4

 BRI

Creating an ISDN BRI connection between 2 routers
On the router dialing out,

hostname(config)#IP Route <Dest Subnet> <Dest Mask> <Via>
hostname(config)#Username <Username> Password <Password>
hostname(config)#Isdn switch-type <type>
hostname(config)#Dialer-list 1 protocol ip <acl/permit  all ip>

hostname(config-if)#Interface bri 0
hostname(config-if)#IP address <IP Address>
hostname(config-if)#Encapsulation PPP
hostname(config-if)#PPP encapsulation CHAP
hostname(config-if)#Isdn spid <spid>
hostname(config-if)#Dial idle-timeout <amount of time>
hostname(config-if)#Dial fast-timeout <amount of time>
hostname(config-if)#Dialer string <number to dial>
hostname(config-if)#Dialer map ip <dest isdn router interface> broadcast name <description> - Use dial map if more then one site
hostname(config-if)#Dialer-group 1
hostname(config-if)#No shutdown

On the router receiving,

hostname(config)#Interface BRI0
hostname(config-if)#IP adress <IP Address>  <Subnet>
hostname(config-if)#Encapusaltion PPP
hostname(config-if)#PPP encapsulation CHAP
hostname(config-if)#Isdn switch-type <type>

PRI

Creating an ISDN Pri connection,

hostname(config)#Controller t1 1/0
hostname(config)#Framing <type>
hostname(config)#Linecode b8zs
hostname(config)#Pri-group timeslots 1-24

hostname(config)#IP Route <Dest Subnet> <Dest Mask> <Via>
hostname(config)#Username <Username> Password <Password>
hostname(config)#Isdn switch-type <type>
hostname(config)#Dialer-list 1 protocol ip <acl/permit all ip>

hostname(config)#Interface serial 1/0:23
hostname(config-if)#IP address <IP Address>
hostname(config-if)#Encapsulation PPP
hostname(config-if)#PPP encapsulation CHAP
hostname(config-if)#Dial idle-timeout <amount of time>
hostname(config-if)#Dial fast-timeout <amount of time>
hostname(config-if)#Dialer string <number to dial>
hostname(config-if)#Dialer map ip <dest isdn router interface> broadcast name <description> - Use dial map if more then one site
hostname(config-if)#Dialer-group 1

Dialer Profiles

Allows different sites to dial across different interfaces. The interface can be thought of as a virtual interface which connects multiple physical interfaces.
To create a Dialer Profile on a router you need to do the following,

hostname(config)#Interface dialer 1
hostname(config)#Dialer remote-name <site name>
hostname(config)#Dialer string <IP> <Number to dial>
hostname(config)#Dialer pool <add interface to pool>

Within the ISDN interface to add it to a pool,

hostname(config)#Interface BRI0
hostname(config-if)#Dialer pool-member <number>

Multi-Link PPP

Allows data to be load balanced over various B channels.

hostname(config)#Interface BRI0
hostname(config-if)#Dialer load-threshold <load> <outbound/inbound/either>
hostname(config-if)#PPP Multilink

Show/Debug Commands

Show dialer interface bri 0
Show interface bri 0:1
Show isdn active
Show isdn status
Debug isdn q931
Debug dialer events
Debug dialer packets