Troubleshooting PPP and PPPoE Dynamic Interfaces

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Troubleshooting PPP and PPPoE Dynamic Interfaces
You can issue the profile-reassign command to help you use PPP and PPPoE packet-logging capabilities to debug and troubleshoot PPP and PPPoE dynamic interfaces. To use the profile-reassign command, you must access Privileged Exec mode at privilege level 5 or higher.

The profile-reassign command enables you to reassign the profile currently assigned to the specified encapsulation type for the specified ATM 1483 subinterface. In effect, you "swap" the currently assigned nondebug profile for a debug profile that has identical attributes with the addition of one or more PPP or PPPoE packet-logging attributes enabled.

To troubleshoot PPP and PPPoE dynamic interfaces:

Create a debug profile that includes the same attributes as an existing nondebug profile, with the addition of one or more PPP or PPPoE packet-logging attributes enabled.

Observe the following guidelines when you create the debug profile:

PPP and PPPoE packet logging is performed at log severity 7 (debug priority). As a result, you should configure a destination such as the console to log severity level 7 and issue the log here command to enable packet capture using the debug profile you created.

Before you reassign the debug profile to the ATM 1483 subinterface, make sure that the number of PPP dynamic interfaces has not already exceeded the maximum number of aggregate dynamic and static PPP interfaces for which you can log PPP packets. For more information about this and other system maximums, see JUNOSe Release Notes, Appendix A, System Maximums.

For details about creating and using profiles, see Configuring a Dynamic Interface from a Profile.
Access Privileged Exec mode at privilege level 5 or higher.
host1>enable 5
Password: *********
host1#
 NOTE: The router prompts you for a password only if you have configured a password to control access to Privileged Exec mode. For details about setting passwords to access various command privilege levels, refer to JUNOSe System Basics Configuration Guide, Chapter 7, Passwords and Security.



 
From Privileged Exec mode, issue the profile-reassign command to replace the nondebug profile currently assigned to the specified encapsulation type for the specified ATM 1483 interface with the debug profile created in Step 1.
You must specify one of the following encapsulation types to which the debug profile applies: ppp, pppoe, or any. You can use the any encapsulation type if neither the ppp encapsulation type nor the pppoe encapsulation type has an existing profile assignment. For example:
host1#profile-reassign atm 2/0.101 ppp pppLogConfig
 NOTE: Issuing the profile-reassign command causes the router to tear down any dynamic interfaces that exist above the ATM 1483 subinterface. After the profile is reassigned, the router restores the interfaces based on the necessary client reconnections. If the ATM 1483 subinterface is currently shut down, issuing the profile-reassign command does not reestablish the interface connection.



 
(Optional) Use the appropriate show command to verify the profile reassignment. For example:
host1#show atm subinterface atm 2/0.101
When you reassign a debug profile to an ATM 1483 subinterface, the reassignment is stored in NVS and persists after a reboot. If you issue the show atm subinterface or show configuration command after the profile is reassigned, these commands will display the new profile assignment.
(Optional) To restore the initial (nondebug) profile assignment after you troubleshoot the dynamic interface, issue the profile-reassign command again using the name of the nondebug profile. For example:
host1#profile-reassign atm 2/0.101 ppp pppConfig
enable

Use to move from User Exec to Privileged Exec mode.

Privileged Exec mode allows you to access all other user interface modes. From here you can configure, monitor, and manage all aspects of the router.

Optionally, you can specify one of the following privilege levels; the default level is 10.

0—Allows the user to execute the help, enable, disable, and exit commands

1—Allows the user to execute commands in User Exec mode plus commands at level 0

5—Allows the user to execute Privileged Exec show commands plus the commands at levels 1 and 0

10—Allows the user to execute all commands except support commands, which may be provided by Juniper Networks Customer Service

15—Allows the user to execute support commands
Set a password for this mode by using either the enable password or the enable secret command in Global Configuration mode. Doing so protects the router from any unauthorized use.

After a password is set, anyone trying to use Privileged Exec mode will be asked to provide the password.

Example
host1>enable 5
Password:*******
host1#
There is no no version.
profile-reassign

Use to reassign the profile currently assigned to the specified encapsulation type for the specified ATM 1483 interface. For troubleshooting purposes, the profile-reassign command lets you "swap" the currently assigned profile for one that has PPP or PPPoE packet-logging attributes enabled.

This command is available from Privileged Exec mode at privilege level 5 or higher.

Specify one of the following keywords:

ppp—Specifies a PPP encapsulation type to which the profile applies

pppoe—Specifies a PPPoE encapsulation type to which the profile applies

any—Specifies any autoconfigured encapsulation that does not have a specific profile assignment; valid only if neither the ppp encapsulation type nor the pppoe encapsulation type has an existing profile assignment
Specify a profile name of up to 80 characters.

Example 1—Facilitates debugging for the ppp encapsulation type by swapping profile pppConfig for profile pppLogConfig, which includes PPP packet-logging attributes
host1#profile-reassign atm 2/0.101 ppp pppLogConfig
WARNING: Execution of this command will cause all dynamic interfaces over 

atm 2/0.101 to be torn-down.
Proceed with profile reassignment? [confirm] yes
Profile pppConfig replaced by profile pppLogConfig for ppp.
Example 2—Facilitates debugging for the any encapsulation type by swapping profile anyConfig for profile anyLogConfig, which includes both PPP and PPPoE packet-logging attributes
host1#profile-reassign atm 3/0.101 any anyLogConfig
WARNING: Execution of this command will cause all dynamic interfaces over 

atm 3/0.101 to be torn-down.
Proceed with profile reassignment? [confirm] yes
Profile anyConfig replaced by profile anyLogConfig for any.
Example 3—Restores the initial (nondebug) profile assignment for the ppp encapsulation type shown in Example 1. Assuming that PPP packet logging is not configured in profile pppConfig, this command also disables logging for the interface
host1#profile-reassign atm 2/0.101 ppp pppConfig
WARNING: Execution of this command will cause all dynamic interfaces over 

atm 2/0.101 to be torn-down.
Proceed with profile reassignment? [confirm] yes
Profile pppLogConfig replaced by profile pppConfig for ppp.
There is no no version.

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