[j-nsp] MLPPP Between JunOS and IOS Cisco Routers

[Scott Berkman]

Does anyone have a set of standard working configurations for MLPPP between
JunOS and Cisco IOS routers, specifically fragmentation settings for use
with a mix of data and voice (including fax) traffic?

 

We are using JunOS 8.X on an M20, and various Cisco devices and codes
including IAD2400's, 2600's, and 3600's.  Here is what we have found to work
best so far for us:

 

JunOS:

 

lsq-3/3/0 {

    per-unit-scheduler;

    unit 1 {

        description TestMultiLink;

        encapsulation multilink-ppp;

        mrru 1500;

        family inet {

            address 1.1.1.1/30;

        }

    }

}

 

Cisco:

interface Multilink1

 ip address 1.1.1.2 255.255.255.252

 ppp multilink

 ppp multilink group 1

 ppp multilink fragment disable

end

 

What have others found to work best?  Are you disabling fragmentation
entirely, or do you have custom fragmentation-maps and something to go along
with it on the Cisco side?

 

                Thanks,

 

                -Scott