To configure the maximum reservable bandwidth as a percentage of the total interface bandwidth for MPLS LSPs on the interface, complete the following steps.
device(config-router-mpls-if-eth-0/1-rsvp)# reservable-bandwidth percentage 80
The percentage value of 100 specifies that the entire interface bandwidth can be used by MPLS LSPs when needed.
When maximum reservable bandwidth is changed from an absolute value to a percentage value, and vice versa, the following advisory message is displayed on the console to indicate this configuration change.
device(config-router-mpls-if-eth-0/1-rsvp)# reservable-bandwidth percentage 40 Maximum reservable bandwidth is changed from 30 kbps to 40%
Note
When the maximum reservable bandwidth is configured as either an absolute value, or a percentage value, the value is recalculated and updated to the latest value.
To set the maximum reservable bandwidth back to the default value (the total physical bandwidth of the interface) when the absolute value or percentage value is used, enter the no form of the command as displayed in the following example.
device(config-router-mpls-if-eth-0/1-rsvp)# no reservable-bandwidth percentage 80
By default, the reservable bandwidth is the same as the maximum available bandwidth on the interface. When the amount of reservable bandwidth is greater than the maximum available bandwidth, then the link can be oversubscribed. When the reservable bandwidth is less than the maximum available bandwidth, then LSPs cannot reserve all physical bandwidth on the interface. When the reservable bandwidth command is applied to the primary port within a LAG, the bandwidth configured for that port applies to the entire LAG, regardless of any change to the number of active ports within the LAG.
Changing the amount of reservable bandwidth on an interface causes the amount of unreserved bandwidth to be recalculated. In addition, it may cause an IS-IS-TE LSP to be issued, as well as possibly pre-empt existing LSPs when bandwidth reservations can no longer accommodate them.
The output from the show running-config router mpls command and the show running-config router mpls mpls-interface ethernet slot/port command displays the maximum reservable bandwidth configuration. Depending on the interface configuration, the show commands displays the maximum reservable bandwidth as an absolute value, or as a percentage value. When the no form of the reservable-bandwidth command is used, the default value of the interface bandwidth is also displayed in both show command outputs.