Andy,
Class Based Weighted Fair Queueing is what you need.
Sample config for R1 and R2 :
class-map best-prio
match access-group 101
class-map best-effort
match access-group 102
policy-map mypolicy
class best-prio
bandwidth 2000...
class best-effort
bandwidth 2000...
access-list 101 permit ip x.x.x.x mask y.y.y.y mask
access-list 102 deny ip x.x.x.x mask y.y.y.y mask
access-list 102 permit ip any any
int DS3
service-policy out mypolicy
With this config, you assure that in case of congestion half of the bandwitdh
(this is configurable) is reserved for the high priority traffic and the other
half is for best-effort.
Regarding the IOS version, it may be supported in your version.
If not, go to 12.0(7)T.
Regards,
Gilles.
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