create two multilink group in router

[adnane dakna]

                   Hi ,

i'm trying to configure two group of multilink in same router , but there is one multilink active , the other multilink is dow

can you explain me this behavior ,

it is possible to create more than one group of multilink.

Best regards.

[Ivan Shirshin · Accepted solution]

Hi Adnane,

It is possible to configure several multilink interfaces on one router. Are you trying to configure those between 2 same routers?

If you are trying to configure 2 multilinks between the same pair of the routers, you shoujld keep in mind that multilink needs to identify how to differentiate between bundles, so you need to identify the member links of the bundle.

In standard configuration without authentication, the differentiation method is to use an endpoint dicriminator for the serial links. Endpoint  discriminators are locally specific to the router, so there is no need to make them match on  source and target router. And, of course, if more than one interface is assigned to the  same multilink bundle they must have the same endpoint discriminator  value.

Here is a small example of how it looks like:

interface Serial 1/0/0:1

     encapsulation ppp

     ip route-cache cef

     ppp multilink

     multilink-group 1

     ppp multilink endpoint string multi1

interface Serial 1/0/1:1

     encapsulation ppp

     ip route-cache cef

     ppp multilink

     multilink-group 1

     ppp multilink endpoint string multi1

For multilink2 you should use different endpoint string, e.g. "multi2".

The other way to distinguish the bundles is to use multilink with authentication, which requires ppp chap and the example of which you can see here:

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

Kind Regards,
Ivan

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