When configuring MPLS Traffic Engineering in your network, you have to specify the amount of bandwidth that the MPLS TE tunnels can request on each MPLS TE-enabled interface with the ip rsvp bandwidth command.

Until recently, this command accepted only fixed bandwidth (in kilobits), which could be pretty inconvenient if you wanted to use common interface templates or deployed MPLS TE on links with varying bandwidth (for example, Multilink PPP bundles). IOS release 12.2SRC introduced a variant of the same command (ip rsvp bandwidth percentage) that allows you to specify reservable bandwidth as percentage of the current interface bandwidth. Unfortunately this feature didn’t make it into 12.4(20)T.