Configuring Vlan Rate Limit - Cisco SF500-24 Administration Manual

Configuring Quality of Service
Configuring QoS - General
STEP 6
NOTE
STEP 1
Cisco 500 Series Stackable Managed Switch Administration Guide
• Committed Information Rate (CIR)—Enter the maximum rate (CIR) in Kbits
per second (Kbps). CIR is the average maximum amount of data that can be
sent.
• Committed Burst Size (CBS)—Enter the maximum burst size (CBS) in bytes.
CBS is the maximum burst of data allowed to be sent even if a burst exceeds
CIR.
Click Apply. The bandwidth settings are written to the Running Configuration file.

Configuring VLAN Rate Limit

The VLAN Rate Limit feature is not available when the switch is in Layer 3 mode.
Rate limiting per VLAN, performed in the
traffic limiting on VLANs. When VLAN ingress rate limiting is configured, it limits
aggregate traffic from all the ports on the switch.
The following constraints apply to rate limiting per VLAN:
• It has lower precedence than any other traffic policing defined in the
system. For example, if a packet is subject to QoS rate limits but is also
subject to VLAN rate limiting, and the rate limits conflict, the QoS rate limits
take precedence.
• It is applied at the device level and within the device at the packet
processor level. If there is more than one packet processor on the device,
the configured VLAN rate limit value is applied to each of the packet
processors, independently. Devices with up to 24 ports have a single
packet processor, while devices of 48 ports or more have two packet
processors.
Rate limiting is calculated separately for each packet processor in a unit and for
each unit in a stack.
Therefore the maximum number of possible packet processors in a stack is eight if
there are four units of 48-ports each.
To define the VLAN ingress rate limit:
Click Quality of Service > General > VLAN Ingress Rate Limit. The
Rate Limit
page is displayed.
This page displays the VLAN Ingress Rate Limit Table.
VLAN Ingress Rate Limit
21
page , enables
VLAN Ingress
386