06-05-2007 04:33 AM - edited 03-03-2019 05:18 PM
I have a 7206 router with 6 T1 lines bound together in a multilink.
3 are on a 4 port T1 controller card, the other three are on a serial port card with CSU/DSUs.
I am going to change out the CSU/DSUs for another T1 controller card.
When I tek down the three serial ports and add the necessary confif, each serial port has this line:
ppp chap hostname 12345
Why is this line there?
Is there anything I will need to do to make sure the interfaces all bind back to the multilink other than the normal T1 controller and serial port config in addition to pointing to the multilink interface?
06-05-2007 06:24 AM
Wilson
Multilink runs with PPP encapsulation. One of the options in PPP is to authenticate using CHAP or PAP. It sounds like the interface may be configured with ppp authentication chap. Is this the case?
Perhaps you can post the config of the multilink and of the serial interfaces.
I would think that if you point the new serial interfaces to the multilink and if you do the normal T1 controller commands and serial port configs that it would all come up ok. If you post the configs we can see if there is anything unusual in them that you would need to be careful about.
HTH
Rick
06-05-2007 06:53 AM
Thanks for the reply rick,
I do see the ppp authentication chap, but it is on a dialer interface and an associated serial port for a backup ISDN link to a different location.
I do not see anything associated with the Multilink interface.
I figured this was pretty straight forward, but wanted to verify I was not overlooking something before tearing into this.
I am thinking also I do not need the
"serial restart-delay 0".
There are 6 T1 lines in this multilink bundle:
interface Multilink123
description MCI MPLS Circuit
ip address 1.2.1.30 255.255.255.252
ppp chap hostname 12345
ppp multilink
ppp multilink fragment disable
ppp multilink group 123
crypto map PEFCU_Crypt
service-policy output QoS
interface Serial1/1
description Multilink PPP to MCI IPFR
no ip address
encapsulation ppp
serial restart-delay 0
no dce-terminal-timing-enable
ppp chap hostname 12345
ppp multilink
ppp multilink group 123
!
interface Serial1/2
description Multilink PPP to MCI IPFR
no ip address
encapsulation ppp
serial restart-delay 0
no dce-terminal-timing-enable
ppp chap hostname 12345
ppp multilink
ppp multilink group 123
!
interface Serial1/3
description Multilink PPP to MCI IPFR
no ip address
encapsulation ppp
serial restart-delay 0
no dce-terminal-timing-enable
ppp chap hostname 12345
ppp multilink
ppp multilink group 123
interface Serial3/1:0
description Multilink PPP to MCI IPFR
no ip address
encapsulation ppp
ppp chap hostname 12345
ppp multilink
ppp multilink group 123
!
interface Serial3/2:0
description Multilink PPP to MCI IPFR
no ip address
encapsulation ppp
ppp chap hostname 12345
ppp multilink
ppp multilink group 123
!
interface Serial3/3:0
description Multilink PPP to MCI IPFR
no ip address
encapsulation ppp
ppp chap hostname 12345
ppp multilink
ppp multilink group 123
!
interface Serial3/0:23
description backup to P
ip address 1.1.2.1 255.255.255.0
encapsulation ppp
dialer idle-timeout 900
dialer-group 1
isdn switch-type primary-4ess
ppp authentication chap
ppp chap password 7 xxxxxx
ppp multilink
crypto map P
interface Dialer1
no ip address
encapsulation ppp
dialer in-band
dialer idle-timeout 900
dialer-group 1
ppp authentication chap
06-06-2007 02:09 AM
Hi ,
your words from previous post :
am thinking also I do not need the
"serial restart-delay 0".
The router resets the hardware each time the serial restart timer expires. This command is often used with the dial backup feature and with the pulse-time command, which sets the amount of time to wait before redialing when a DTR dialed device fails to connect.
When the count value is set to the default of 0, the hardware is not reset when it goes down. In this way, if the interface is used to answer a call, it does not cause DTR to drop, which can cause a communications device to disconnect.
Examples
The following example shows how to set the restart delay on serial interface 0 to 0:
Router(config)# interface serial 0
Router(config-if)# serial restart-delay 0
To create a multilink bundle and enter multilink interface configuration mode to configure the bundle, use the interface multilink command in global configuration mode
In your case , serial 1/0 to 1/3 and serail 3/1:0 to 3/3:0 are used for multilink bundling..
where serial 3/0:0 is used for isdn connectivity which may be back up for these serials.
check the below link.
Thanks,
Satish
06-06-2007 03:22 AM
Thanks
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