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Layer 2 switch operation - Clarify for me

CCNA, CCDA, CCNP, CCDP, CCIP, CCVP and CCIE

Re:Layer 2 switch operation - Clarify for me

Postby Guest » Sat Jan 08, 2011 5:25 pm


I could tell more by saying that L3 address stays unchanged end to end, but L2 address is changed from hop to hop.

For example if PC1 wants to send packet to PC2, it places PC2 Ip address in the packet header but the MAC address of the next hop (of the path) in the frame header.

When the next hop, may be a default gateway (such as a router)receives the frame, it stripp off the frame, replaces the MAC address with the one of the next hop (may be the final destination PC2) and so on.

But (i think) it does never changes the L3 address of the destination. (May somebody corrects me if i am wrong).

Guest
 

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Re:Layer 2 switch operation - Clarify for me

Postby Guest » Sat Jan 08, 2011 6:29 pm


Hi,

for completeness a minor remark: there is one exception where the L3 address of a transit packet is changed by a router: Network Address Translation - NAT.

Regards, Martin

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Re:Layer 2 switch operation - Clarify for me

Postby Guest » Sat Jan 08, 2011 6:35 pm


ok.. you're right..special case

Guest
 

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