A company has configured two switches as an HP Intelligent Resilient Framework (IRF) virtual
device. The IRF port on each switch is bound to multiple physical links. How does the switch
select the link for transmitting packets on that IRF port?
A.
It uses a round-robin mechanism in which it sends each packet over a different link in turn.
B.
It uses a weighted round-robin mechanism, in which it sends each packet over a different link in
turn, but can send more packets over certain links over higher weighted.
C.
It uses one of the links as an active link, the other links are in standby mode and can
become active if the active link fails
D.
It uses a hash of various Layer 2, 3, or 4 information in the packet, depending on the type of
traffic, the switch model, and the IRF load-sharing.
Explanation:
pas c petet D
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Réponse D, c’est du load-sharing.
http://www.h3c.com/portal/Technical_Support___Documents/Technical_Documents/Switches/H3C_S12500_Series_Switches/Configuration/Operation_Manual/H3C_S12500_CG-Release7128-6W710/02/201301/772606_1285_0.htm#_Toc341179134
IRF link redundancy
· Up to 12 physical ports can be bound to one IRF port for IRF link redundancy. The physical ports of an IRF port are load shared.
· Physical ports bound to an IRF port can be located on different cards.
· H3C recommends using multicard IRF links to avoid a card removal causing an IRF split.
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Load sharing across physical links bound to IRF ports
If you bind multiple physical links to one virtual IRF port, the switch load shares traffic across those physical links. You can configure the switch to load share traffic based on the following:
• Source IP address
• Destination IP address
• Source MAC address
• Destination MAC address
• Combination of source and destination IP addresses
• Combination of source and destination MAC addresses
Each Comware switch uses a particular criterion to load share the traffic by default. Most Comware switches use a different criterion for Layer 2, Layer 3, or Layer 4 traffic. For example, the 12500 Switch Series uses the following criteria by default:
• At Layer 2, a 12500 switch uses source and destination MAC addresses.
• At Layer 3, a 12500 switch uses source and destination IP addresses.
• At Layer 4, a 12500 switch uses source and destination ports.
However, some Comware switches may use a different criterion. For example, some of the 5800 switches (the 5800-48G Switch with 1 Interface Slot, 5800-48G TAA Switch with 1 Interface Slot, 5800-48G-PoE+Switch with 1 Interface Slot, and 5800-48G-PoE+TAA Switch with 1 Interface Slot) load share traffic based on the port number on which the traffic is received. Other switches in the HP 5800 and 5820X Switch Series load share Layer 2 traffic based on the source and destination MAC addresses and Layer 3 traffic based on the source and destination IP addresses. (Check the documentation for the particular Comware switches you are using to form the IRF virtual device to determine how these switches load share across the physical links bound to IRF ports.)
So the Correct Answar is D
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D
The guy above me said everything what is needed to find the right answer 🙂
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