R2511-HP MSR Router Series ACL and QoS Configuration Guide(V5)

max-bandwidth command configured, if the sum of sub-channel bandwidth equals to or exceeds

the sum of AF bandwidth and EF bandwidth, AF and EF calculate bandwidth based on the actual

interface bandwidth. Otherwise, AF and EF calculate bandwidth based on 1 Gbps of bandwidth,

and the message indicating insufficient bandwidth is displayed. In the latter case, the queuing

function might fail to take effect.

• On tunnel interfaces, subinterfaces, HDLC link bundle interfaces, or VT/dialer interfaces using

PPPoE, PPPoA, PPPoEoA, PPPoFR, or MPoFR (frame relay traffic shaping is not enabled on the frame

relay interface) at the data link layer, you must configure the qos max-bandwidth command to

provide base bandwidth for CBQ calculation.

Configuration procedure

To configure the maximum interface available bandwidth:

Ste

Command

1. Enter system view.

system-view

2. Enter interface view.

interface interface-type interface-number

3. Configure the maximum available

bandwidth of the interface.

qos max-bandwidth bandwidth

If no maximum available bandwidth is configured for an interface, the bandwidth used for CBQ

calculation is as follows:

• If the interface is a physical one, the actual baud rate or rate applies.

• If the interface is a VLAN interface, 1000000 kbps applies.

• If the interface is an E1, MFR or any other type of logical serial interface formed by timeslots or

multiple links, the total bandwidth of all member channels/links applies.

• If the interface is a template interface, a VT, BRI, PRI or dialer interface for example, 1000000 kbps

applies.

• If the interface is a virtual interface, a tunnel or HDLC link bundle interface for example, 0 kbps

applies.

Setting the maximum reserved bandwidth as a percentage of

available bandwidth

The maximum reserved bandwidth is set on a per-interface basis. It decides the maximum bandwidth

assignable for the QoS queues on an interface. It is typically set no greater than 80% of available

bandwidth, considering the bandwidth for control traffic and Layer 2 frame headers.

Use the default maximum reserved bandwidth setting in normal cases. When tuning the setting, make

sure that the Layer 2 frame header plus the data traffic is under the maximum available bandwidth of the

interface.

To configure the maximum reserved bandwidth on an interface:

Ste

Command

Remarks

1. Enter system view.

system-view N/A