Avaya 882 사용자 설명서

13-20

User Guide for the Avaya P580 and P882 Multiservice Switches, v6.1

Chapter 13

the CPU for processing and forwarding. Once the CPU has 
determined the destination, it updates the L3 forwarding cache on 
the F-chips with the L3FE. Once updated, the F-chip can forward 
future packets via Fast Path.

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SA: Source IP Address.

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Slow Path: When an ingress F-chip does not recognize a packet 
compared to its cache of known Flows, the packet is forwarded to 
the CPU to determine proper destination and ACL Rule assignment. 

You can use several techniques to optimize the switch performance when an 
access list is enabled. The techniques are related and must be considered 
together. 

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When the ACL is the root of a performance problem, it shows as the Slow 
Path becoming overused. The Slow Path is not designed to handle 
significant traffic levels since the single CPU also handles all other 
management functions. There are several ways to determine if the CPU is 
overloaded:

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Continuous PING to the supervisor: timeouts or inconsistent timing 
of echo responses.

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Slow Scrolling LED Marquee: This is good visual sign that the CPU 
is busy.

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Slow Management response: If Avaya Multiservice Network 
Manager (MSNM), Avaya Policy Manager (APM), HPOV, or a 
MIB browser get slow updates, this can signify a busy CPU or 
saturated network. 

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Slow network response: This can be measured in a variety of ways.