PPP Setup for Leased Sync LineHow to set up a Lucent router to connect to another router on a leased line via Point To Point Protocol (PPP) using its ethernet for the serial link and dynamically discovering information of the other router.. Make sure the CSU/DSU is providing an external clock source. The following examples give the commands to accomplish this. Change addresses to match yours. Configuring Unit at HQ:Command> set ether0 address 172.16.1.1 Command> set netmask 255.255.255.0 Command> set ipxnet AC100100 Command> set ipxframe ethernet_802.3 { or whatever you are using Command> set s1 network hardwire Command> set s1 destination 172.16.2.1 Command> set s1 netmask 255.255.255.0 Command> set s1 ipxnet AC100101 Command> set s1 protocol ppp Command> set s1 routing on Command> set s1 mtu 1500 Command> save all Command> reset s1 Configuring Unit at remote site:Command> set ether0 address 172.16.2.1 Command> set netmask 255.255.255.0 Command> set ipxnet AC100200 Command> set ipxframe ethernet_802.3 { or whatever you are using Command> set s1 network hardwire Command> set s1 destination 172.16.1.1 Command> set s1 netmask 255.255.255.0 Command> set s1 ipxnet AC100101 Command> set s1 protocol ppp Command> set s1 routing on Command> set s1 mtu 1500 Command> save all Command> reset s1 If you have a connection problem, the following two commands display the
PPP negotiations. The Configuration Guide has a section on interpreting the
following debug. Command> set console Command> set debug 0x51 To turn the debug off use the following commands: Command> set debug 0 or set debug off Command> reset console If you put the CSU/DSU into local loopback or the remote CSU/DSU into loopback while debug 0x51 is set, you should see LCP_APPARENT_LOOP messages displayed. Information For TroubleshootingCHECK ERROR COUNTERS FIRST ON CSU/DSU The CSU/DSU error counter should display all zeros. If errors are incrementing this could be an indication of a hardware problem unrelated to the Lucent IRX (TM) router. Verify that the CSU/DSU, modem and line cables are securely attached and that known good cables are being used. Beaware that a few abort errors from plugging & unplugging cables is normal.. There have been three instances on a sync line where the abort counter on a CSU/DSU connected to an IRX router increments:
If the framing errors on the IRX are greater than 0 and the other router is not an IRX, make sure it is using PPP encapsulation not High Level Data Link Control (HDLC). If errors persist on the CSU/DSU and all other items mentioned above have been
checked, refer the problem to the local telephone company providing the line to check for
errors on the line. |