Cisco CATALYST 4000 32 PORT 10/100 L3 MODULE WITH 2 PORT GBIC Specification Guide
A. No, WRR is implemented only for routed IP packets based on the two bits of IP
precedence.
precedence.
Q. Is Class Based Weighted Fair Queuing (CBWFQ) or Low Latency Queuing
(LLQ) supported in the Layer 3 (L3) Catalyst switches?
(LLQ) supported in the Layer 3 (L3) Catalyst switches?
A. No, modular QoS Command-Line Interface (CLI) features like CBWFQ and LLQ are
not supported in the L3 Catalyst switches.
not supported in the L3 Catalyst switches.
Q. Do the Layer 3 (L3) Catalyst switches implement any congestion avoidance
mechanisms such as Weighted Random Early Detection (WRED)?
mechanisms such as Weighted Random Early Detection (WRED)?
A. No, congestion avoidance mechanisms such as WRED are not supported.
Q. Do the Layer 3 (L3) Catalyst switches support IEEE 802.1p classification or
Class of Service (CoS) classification?
Class of Service (CoS) classification?
A. No, 802.1p or Layer 2 (L2) CoS-based classifications are not supported. 10/100 ports
on the WS-X4232-L3 module do support them since they are L2 ports, but the CoS
value is not retained if the packet is routed through the WS-X4232-L3 module.
on the WS-X4232-L3 module do support them since they are L2 ports, but the CoS
value is not retained if the packet is routed through the WS-X4232-L3 module.
Q. Is the Layer 2 (L2) Class of Service (CoS) value retained for packets routed
through the WS-X4232-L3 module?
through the WS-X4232-L3 module?
A. Even though the routed ports on the WS-4232-l3 module do not support L2 CoS, the
rest of the 10/100 ports support L2 CoS-based input classification and output
scheduling. These features are also supported on all other Ethernet modules (line cards)
on the Catalyst 4000 switch. Frames received with CoS values are trusted on the
inbound port, but the CoS value is lost when it is routed through the WS-X4232-L3
module to an egress port in a different VLAN. CoS value is retained when the outbound
port is in the same VLAN as the inbound port and is configured for trunking.
rest of the 10/100 ports support L2 CoS-based input classification and output
scheduling. These features are also supported on all other Ethernet modules (line cards)
on the Catalyst 4000 switch. Frames received with CoS values are trusted on the
inbound port, but the CoS value is lost when it is routed through the WS-X4232-L3
module to an egress port in a different VLAN. CoS value is retained when the outbound
port is in the same VLAN as the inbound port and is configured for trunking.
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Page 6 of 7
Cisco - Catalyst G-L3 Series Switches and WS-X4232-L3 Layer 3 Modules QoS FAQ
7/20/2004
http://www.cisco.com/warp/customer/473/125.html