percent Percent of interface bandwidth allocated for RSVP, CBWFQ, LLQ, IP RTP Priority, Frame Relay IP RTP Priority, and Frame Relay PIPQ.
To change the percent of interface bandwidth allocated for Resource Reservation Protocol (RSVP), class-based weighted fair queueing (CBWFQ), low latency queueing (LLQ), IP RTP Priority, Frame Relay IP RTP Priority, and Frame Relay PVC Interface Priority Queueing (PIPQ), use the max-reserved-bandwidth interface configuration command. To restore the default value, use the no form of this command.
The default is 75 percent.
The sum of all bandwidth allocation on an interface should not exceed 75 percent of the available bandwidth on an interface. The remaining 25 percent of bandwidth is used for overhead, including Layer 2 overhead, control traffic, and best-effort traffic.
If you need to allocate more than 75 percent for RSVP, CBWFQ, LLQ, IP RTP Priority, Frame Relay IP RTP Priority, and Frame Relay PIPQ, you can use the max-reserved-bandwidth command. The percent argument specifies the maximum percentage of the total interface bandwidth that can be used.
If you do use the max-reserved-bandwidth command, make sure that not too much bandwidth is taken away from best-effort and control traffic.
The max-reserved-bandwidth command is intended for use on main interfaces only; it has no effect on virtual circuits (VCs) or ATM permanent virtual circuits (PVCs).
In the following example, the policy map called policy1 is configured for three classes with a total of 8 Mbps configured bandwidth, as shown in the output from the show policy-map command:Router#show policy-map policy1 Policy Map policy1 Weighted Fair Queueing Class class1 Bandwidth 2500 (kbps) Max Threshold 64 (packets) Class class2 Bandwidth 2500 (kbps) Max Threshold 64 (packets) Class class3 Bandwidth 3000 (kbps) Max Threshold 64 (packets)
When you enter the service-policy command in an attempt to attach the policy map on a 10-Mbps Ethernet interface, an error message such as the following is produced:
I/f Ethernet1/1 class class3 requested bandwidth 3000 (kbps) Available only 2500 (kbps)
The error message is produced because the default maximum configurable bandwidth is 75 percent of the available interface bandwidth, which in this example is 7.5 Mbps. To change the maximum configurable bandwidth to 80 percent, use the max-reserved-bandwidth command in interface configuration mode, as follows:max-reserved-bandwidth 80 service output policy1 end
To verify that the policy map was attached, enter the show policy-map interface command:Router#show policy-map interface e1/1 Ethernet1/1 output :policy1 Weighted Fair Queueing Class class1 Output Queue:Conversation 265 Bandwidth 2500 (kbps) Packets Matched 0 Max Threshold 64 (packets) (discards/tail drops) 0/0 Class class2 Output Queue:Conversation 266 Bandwidth 2500 (kbps) Packets Matched 0 Max Threshold 64 (packets) (discards/tail drops) 0/0 Class class3 Output Queue:Conversation 267 Bandwidth 3000 (kbps) Packets Matched 0 Max Threshold 64 (packets) (discards/tail drops) 0/0
Virtual Template Configuration Example
The following example configures a strict priority queue in a virtual template configuration with CBWFQ. The max-reserved-bandwidth command changes the maximum bandwidth allocated between CBWFQ and IP RTP Priority from the default (75 percent) to 80 percent.multilink virtual-template 1 interface virtual-template 1 ip address 172.16.1.1 255.255.255.0 no ip directed-broadcast ip rtp priority 16384 16383 25 service-policy output policy1 ppp multilink ppp multilink fragment-delay 20 ppp multilink interleave max-reserved-bandwidth 80 end interface Serial0/1 bandwidth 64 ip address 10.1.1.2 255.255.255.0 no ip directed-broadcast encapsulation ppp ppp multilink end
To make the virtual access interface function properly, do not configure the bandwidth command on the virtual template. Configure it on the actual interface, as shown in the example.
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