Limiting PPP Multilink bandwidth usage

[ciccio4242]

Hi,

I have two ISDN routers, both having the BRI ports.

On my router, ports are configured as follows:

interface BRI0

bandwidth 128

no ip address

encapsulation ppp

dialer pool-member 1

isdn switch-type basic-net3

no cdp enable

!

interface BRI1

bandwidth 128

no ip address

encapsulation ppp

dialer pool-member 1

isdn switch-type basic-net3

no cdp enable

!

interface Dialer1

bandwidth 128

ip address <ip> <Netmask>

encapsulation ppp

dialer pool 1

dialer remote-name <name>

dialer idle-timeout 30

dialer string <number>

dialer caller <number>

dialer load-threshold 1 either

dialer-group 1

no cdp enable

!

Remote is configured as follows:

interface BRI0

bandwidth 128

no ip address

encapsulation ppp

dialer pool-member 1

isdn switch-type basic-net3

no cdp enable

ppp multilink

!

interface BRI1

bandwidth 128

no ip address

encapsulation ppp

dialer pool-member 1

isdn switch-type basic-net3

no cdp enable

ppp multilink

!

interface Dialer1

bandwidth 128

ip address <ip> <Netmask>

encapsulation ppp

dialer pool 1

dialer remote-name <name>

dialer idle-timeout 30

dialer string <number>

dialer caller <number>

dialer load-threshold 1 either

dialer-group 1

ppp multilink

no cdp enable

!

What happens is that all of the four B-channels are used, even if I have set bandwidth 128, so if I dial to this remote site I can't dial to the other remote sites I have.

How can I correct this behaviour, i.e. have my remote site that takes no more than 2 B channels?

Thanks

Ciao

[network.king]

Hi ,

You have configured a single dialer and have binded the BRI with the dialer and with this config , you cannot connect to two locations.

Use two dialer and bind each BRI with each dialer and use it to connect to two locations.

For a single location means , change the dialer load threshold to 150 ( 150/255 ) load so that the four channels are not triggered immediately rather than getting triggered based on load condition.

Pls let me know if your requirement was something else

regards

vanesh k

[ciccio4242]

This was only an example. I have 20 different dialers.

What I need is not to have all four channel triggered after a while, but to have no more than two channels triggered, whatever bandwidth requirement I have.

Ciao

[senglobe0907]

use load threshold command.

[Richard Burts]

In the original post from Francesco it is clear that both dialer intefaces already do specify the load threshold command.

I note in the original post that the first router does not include ppp multilink in its config while the remote router does specify ppp multilink. I am not clear whether the difference is real or is a result of inconsistent cut and paste by Francesco. I would think it would be problematic if the configs were really inconsistent in this matter.

I also note that there is no authentication on the BRI or on the Dialer interfaces. I have seen situations where not specifying authentication will cause one connection to be made for inbound traffic and a different connection to be made for outbound traffic. I suggest configuring ppp authentication (could be PAP or could be CHAP) and see if that changes the behavior.

HTH

Rick

[ciccio4242]

Rick,

I'll try tomorrow your suggestions. There are no ppp multilink on one side, because when I had ppp multilink on both sides I had the problem that after a while, router stopped making dial out, i.e. the debug showed interesting traffic, but this didn't cause a dialup anymore.

Somebody suggested me to remove ppp multilink from my side, and this effectively worked, since I hadn't experienced that problem anymore.

Ciao

ciccio4242

[ciccio4242]

Rick,

no, putting ppp authentication on BRI interface does not work.

Any ideas?

Ciao

[network.king]

Hi,

If your requirement is only to have two channels triggered , then associate each BRI with a dialer , so that you have a max of 2 channels . But in case if you want multiple dialers to use a single BRI , then go fo dialer rotary group.

pls let us know if you requirement was diff

regards

vanesh k

[ciccio4242]

network.king,

I need to have more dialers than BRI's, so I'll deal with dialer rotary groups. but can U please explain me how they work, and what's the difference with or without them?

Thanks a lot

Ciao

[avillalva]

If you make just one of the BRI interfaces part of dialer pool-member 1 then the dialer will only be able to use that BRI.

hope that helps,

Andres