1.1.d [iv] TTL
Time to live (TTL) is a hop limit set to limit the lifetime of data on a network. This prevents data from looping endlessly. Each hop decrements the value by 1. If TTL reaches 0, the data is discarded and…
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Author Archive: admin
1.1.d [i] ICMP unreachable, redirect
ICMP offers troubleshooting facility as well as error reporting for the packets 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2…
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1.1.c [iv] Impact of micro burst
From what i understand is that a micro-burst occurs when a specific amount of data (in bytes) is exceeded in a given time interval. Example when you do a show interface | in Input and by repeat this command the numbers…
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1.1.c [ii] Out of order packets
RFC 793 ( pages 20 and up ) TCP is the protocol that make sure that the transmission is done without losing any packet by going through a set of operation for the order of transmission and for any duplication detection….
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1.1.c [iii] Asymmetric routing
Asymmetric routing is when Packets follow different paths depending on the direction. Asymmetric routing is one of the two most common causes of flooding.
1.1.c [i] Unicast flooding
This happen when the switch does not have the destination mac address in his Layer 2 table. It is call an Unknown unicast , it Floods frame out all interfaces in the same VLAN, except the interface on which the frame was received….
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1.1.b [iii] Polarization concept and avoidance
Lab ready will now try to understand that carefully since i don’t understand at alllllllllllllllll 😛 http://ciscocramfest.blogspot.ca/2014/12/notes-cef-polarization.html no comprende !!! http://www.cisco.com/c/en/us/support/docs/ip/express-forwarding-cef/116376-technote-cef-00.html http://www.cisco.com/c/en/us/support/docs/ip/express-forwarding-cef/116376-technote-cef-00.pdf http://wiki.kemot-net.com/igp-load-sharing-cef-polarization
1.1.b [ii] Load balancing Hash
Ref: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipswitch_cef/configuration/15-mt/isw-cef-15-mt-book/isw-cef-load-balancing.html CEF Load-Balancing Cisco Express Forwarding load balancing is based on a combination of source and destination packet information; it allows you to optimize resources by distributing traffic over multiple paths. You can configure load balancing on a per-destination or…
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1.1.b [i] RIB, FIB, LFIB, Adjacency table
RIB ( Routing Information Base ) FIB ( Forwarding Information Base ) LIB ( Label Information Base ) LFIB ( Label Forwarding Instance Base ) Adjacency table CAM table RIB : The routing table contain all the informations regarding the creation of…
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1.1.b Identify Cisco express forwarding concepts
What is CEF? Definition from Cisco.com : Cisco Express Forwarding (CEF) is advanced, Layer 3 IP switching technology. CEF optimizes network performance and scalability for networks with large and dynamic traffic patterns, such as the Internet, on networks characterized by…
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