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Host Mac address in multiple switches CAM table

jskfan
jskfan asked
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Last Modified: 2018-12-07
Host Mac address in multiple switches CAM table

I would like to know if a MAC address of a computer or Router that is connected to Switch1 will be also found in CAM table of Switch2 , Switch3 ,etc... assuming all switches are connected to each other.

Thank you
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David Johnson, CDSimple Geek from the '70s
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Distinguished Expert 2019

Commented:
Yes but only if there has been communication. It will not be the same on each switch

i.e.
computer 1 | switch1-port 1 | switch 2-port20 | computer 2

switch 1 will have computer 1 and switch 2 mac address
switch 2 will have switch 1 and computer 2 mac address

switch 1 will not have computer 2 mac address it will use switch 2 mac adddress
Les MooreSystems Architect
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Top Expert 2008

Commented:
Yes, the mac addresses are maintained throughout the  network all the way to the router that holds the arp cache.
nociSoftware Engineer
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Distinguished Expert 2019

Commented:
@david:

[computer1]<--->[port1-switch1-port48]<--->[port24-switch2-port20]<---->[computer2]

    switch 1 will have the computer2 macaddress  with reference/forwarding port = port48 (where it was seen from)
    switch 2 will have the computer2 macaddress with reference/forwarding port = port20

likewise:
    switch 1 will see computer1 on port1 and
    switch 2 will see computer1 on port24.

Author

Commented:
Thank you Guys..

For the Mac Address of a host1 in  CAM table of SwitchA to exist  in CAM Table of SwitchN ,  does this happen automatically the first time Host1 is plugged to a port on SwitchA,  OR Host1 at somepoint needs to communicate with another Host on SwitchN  in order to have SwitchN register the Mac address of Host1
Thanks
Software Engineer
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Commented:
This one is on us!
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Commented:
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