Cisco CATALYST 4000 32 PORT 10/100 L3 MODULE WITH 2 PORT GBIC 规格指南
Catalyst G-L3 Series Switches
and WS-X4232-L3 Layer 3
Modules QoS FAQ
and WS-X4232-L3 Layer 3
Modules QoS FAQ
Document ID: 19641
Questions
Introduction
Which QoS features do the Layer 3 (L3) Catalyst
switches support?
switches support?
What is the minimum software required for QoS on
the Layer 3 (L3) Catalyst switches?
the Layer 3 (L3) Catalyst switches?
Can the Layer 3 (L3) Catalyst switches mark or
rewrite IP precedence Type of Service (ToS) bits in an
IP packet?
rewrite IP precedence Type of Service (ToS) bits in an
IP packet?
Are there any restrictions on the ports to which the
per-port traffic conditioning can be applied?
per-port traffic conditioning can be applied?
Does the per-port output rate-limiting apply to all (IP
and non-IP) traffic destined for output on the applied
port?
and non-IP) traffic destined for output on the applied
port?
Does the per-port input rate-limiting apply to all (IP
and non-IP) traffic received on the applied port?
and non-IP) traffic received on the applied port?
Can I disable Internetwork Packet Exchange (IPX)
routing and transition to the per-port traffic shaping
feature without power cycling the switch?
routing and transition to the per-port traffic shaping
feature without power cycling the switch?
Can I enable per-port traffic shaping for the first time without user interruption?
Can the rate-limiting feature be used on ports configured to be in a bridge group?
Can the Access Control Lists (ACLs) or class maps be used to define the traffic
that needs to be rate-limited or shaped?
that needs to be rate-limited or shaped?
Can the input rate-limiting and output rate-limiting be applied on the same
interface?
interface?
Do Layer 3 (L3) Catalyst switches support asymmetrical ingress and egress rate-
limiting?
limiting?
Why is it that, when I issue the show interface fastethernet x rate-limit command, I
get no output?
get no output?
Why is it that I get a lower performance for TCP traffic with rate-limiting?
What is the typical value of burst size to be used for rate-limiting on Layer 3 (L3)
switches?
switches?
How does the input or ingress classification work?
How does the output or egress scheduling work?
Can the QoS output scheduling be changed on an interface level?
Does the Weighted Round-Robin (WRR) work on an interface configured to be in
a bridge group?
a bridge group?
Is Class Based Weighted Fair Queuing (CBWFQ) or Low Latency Queuing (LLQ)
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Page 1 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