[c-nsp] MLPPP and bandwidths

[Steve Wright]

Hi all,

I'm currently trying to configure up Multilink PPP for ADSL connections.

This is being configured with 2 ADSL circuits terminated onto a 1721. The
LNS is a 7301.

I find that the circuits are bundled, and traffic from the 1721 to the 7301
is balanced over both circuits.

However, from the 7301 to the 1721, only 1 of the circuits are used. These
virtual interfaces are created from the following virtual template...

interface Virtual-Template1
 bandwidth 2272
 ip unnumbered Port-channel1
 ip verify unicast reverse-path
 ip mroute-cache
 no logging event link-status
 load-interval 30
 no snmp trap link-status
 peer default ip address pool default
 no keepalive
 ppp mtu adaptive
 ppp authentication chap pap
 ppp ipcp dns xxx.xxx.4.247 xxx.xxx.96.38
 ppp multilink
 ppp multilink fragment disable
 ppp multilink links minimum 2
 ppp multilink endpoint hostname
 ppp timeout retry 15
 ppp timeout authentication 15
end


With multilink, the virtual-interfaces seem to have their own mind of what
they are configured as (please see below...)


interface Virtual-Access4098
 bandwidth 2272
 ip unnumbered Port-channel1
 ip verify unicast reverse-path
 ip mroute-cache
 no logging event link-status
 load-interval 30
 no snmp trap link-status
 no routing dynamic
end

interface Virtual-Access23
 bandwidth 565
 ip mroute-cache
 no logging event link-status
 no snmp trap link-status
end

interface Virtual-Access4099
 bandwidth 155520
 ip mroute-cache
 no logging event link-status
 no snmp trap link-status
end


Also, if I do a show ppp multilink the weightings seem very biased toward
one circuit...
    lac_02:Vi4099  (xxx.xxx.0.74), since 00:01:50, 583200 weight, 1496 frag
size, unsequenced
    lac_02:Vi23  (xxx.xxx.0.74), since 00:01:56, 2118 weight, 1496 frag
size, unsequenced

Any thoughts of help would be very much appreciated!

Thanks,

Steve



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