Solved: STM-1 + PPP Multilink bundle

hetene_kaz · ‎05-25-2007

There are two 7206 in two cities. Each has PA-STM1.

Connecting two 7206 to each other is done via SDH, then PPP Multilink bundle with 8xE1 in it was set up. It is maximum quantity of E1 for multilink interface. So, I have 16mbit/s link.

I want to expand my link. It's impossible to set up the second Multilink because Cisco says:

029778: May 23 19:25:30.714 ALM: Se2/0.1/1/4/2:0 MLP: Request add link to bundle

029779: May 23 19:25:30.714 ALM: Se2/0.1/1/4/2:0 MLP: Adding link to bundle

029780: May 23 19:25:30.714 ALM: Serial2/0.1/1/4/2:0 MLP: Local MRRU or peer MRRU does not match that of bundle akt-oup0-bb1

Is the solution to unset the Multilink to separate 8 interfaces, to add, for example, 8 E1 more, to assign p2p addresses to each pair and to do load balancing between 16 parallel p2p's??

Or are there any other ways?

paolo bevilacqua · ‎05-28-2007

OK. It seems the documentation applies to older IOS but there are now in 12.4 novel waysto discriminate among bundles.

Please try

interface multink 1

ppp multilink endpoint string

Also, seems you can set a larger number of links now:

ppp multilink links maximum 16

and in global config:

multilink bundle-name rfc

I understand that all this is quite confusing, unfortunately I don't have an adequate platform to test that now.

View solution in original post

paolo bevilacqua · ‎05-26-2007

Hi,

with multiple MLP bundles between routers, you will need to configure usernames for each bundle.

Please see:

http://www.cisco.com/en/US/tech/tk713/tk507/technologies_configuration_example09186a0080093c1d.shtml

Hope this helps, please rate post if it does!

hetene_kaz · ‎05-28-2007

Doesn't work...

Here is a config:

interface Multilink1

description backbone link 1

ip address 17.x.x.25 255.255.255.252

ppp chap hostname parallel_multilink_1

ppp chap password xxx

ppp multilink

multilink-group 1

interface Multilink6

description backbone link 2

ip address 17.x.x.1 255.255.255.252

ppp chap hostname parallel_multilink

ppp chap password xxx

ppp multilink

multilink-group 6

On the second side config is identical.

As I think, "parallel_multilink_1" must be shown in "show ppp multilink" command output.

But even shut->no shut doesn't change this name. Everytime I see:

atr-pp6-bb#show ppp multilink

Multilink1, bundle name is akt-oup0-bb

Bundle up for 00:08:58

0 lost fragments, 226306 reordered, 0 unassigned

0 discarded, 0 lost received, 131/255 load

0xCC2E9 received sequence, 0x11C6E9 sent sequence

Member links: 4 active, 0 inactive (max not set, min not set)

Se2/0.1/1/3/2:0, since 00:08:58, last rcvd seq 0CC2E7

Se2/0.1/1/1/1:0, since 00:08:58, last rcvd seq 0CC2E8

Se2/0.1/1/1/3:0, since 00:08:58, last rcvd seq 0CC2E5

Se2/0.1/1/1/2:0, since 00:08:58, last rcvd seq 0CC2E6

There is never a word about "parallel_multilink" or "parallel_multilink_1" here.

If I shut down Mu1, Mu6 goes to Up, but still with name "akt-oup0-bb".

Also my IOS 12.2(25)S4 doesn't know command:

atr-pp6-bb2(config)#interface Multilink6

atr-pp6-bb2(config-if)#ppp authentication chap

^

% Invalid input detected at '^' marker.

paolo bevilacqua · ‎05-28-2007

Hello,

have you configured:

multilink bundle-name authenticated

as per documentation link above ?